Geology (from Ancient Greek γῆ ( gê ) 'earth' and λoγία ( -logía ) 'study of, discourse') is a branch of natural science concerned with the Earth and other astronomical objects , the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences , including hydrology . It is integrated with Earth system science and planetary science .
135-415: The Australian Encyclopaedia is an encyclopedia focused on Australia. In addition to biographies of notable Australians the coverage includes the geology , flora , fauna as well as the history of the continent. It was first published by Angus and Robertson in two volumes, one each in 1925 and 1926. The most recent edition, the sixth, is of eight volumes published in 1996. The Australian Encyclopedia
270-535: A characteristic fabric . All three types may melt again, and when this happens, new magma is formed, from which an igneous rock may once again solidify. Organic matter, such as coal, bitumen, oil, and natural gas, is linked mainly to organic-rich sedimentary rocks. To study all three types of rock, geologists evaluate the minerals of which they are composed and their other physical properties, such as texture and fabric . Geologists also study unlithified materials (referred to as superficial deposits ) that lie above
405-485: A petrographic microscope , where the minerals can be identified through their different properties in plane-polarized and cross-polarized light, including their birefringence , pleochroism , twinning , and interference properties with a conoscopic lens . In the electron microprobe, individual locations are analyzed for their exact chemical compositions and variation in composition within individual crystals. Stable and radioactive isotope studies provide insight into
540-693: A southerly buster , a powerful southerly that brings gale winds and a rapid fall in temperature. Since Sydney is downwind of the Great Dividing Range , it occasionally experiences dry, westerly foehn winds typically in winter and early spring (which are the reason for its warm maximum temperatures). Westerly winds are intense when the Roaring Forties (or the Southern Annular Mode ) shift towards southeastern Australia, where they may damage homes and affect flights , in addition to making
675-434: A definite homogeneous chemical composition and an ordered atomic arrangement. Each mineral has distinct physical properties, and there are many tests to determine each of them. Minerals are often identified through these tests. The specimens can be tested for: A rock is any naturally occurring solid mass or aggregate of minerals or mineraloids . Most research in geology is associated with the study of rocks, as they provide
810-514: A feature of Sydney's topography. After Phillip's departure in December 1792, the colony's military officers began acquiring land and importing consumer goods from visiting ships. Former convicts engaged in trade and opened small businesses. Soldiers and former convicts built houses on Crown land, with or without official permission, in what was now commonly called Sydney town. Governor William Bligh (1806–08) imposed restrictions on commerce and ordered
945-661: A few areas of wet sclerophyll forests in the wetter, elevated areas in the north and northeast . These forests are defined by straight, tall tree canopies with a moist understory of soft-leaved shrubs, tree ferns and herbs. The predominant vegetation community in Sydney is the Cumberland Plain Woodland in Western Sydney ( Cumberland Plain ), followed by the Sydney Turpentine-Ironbark Forest in
1080-503: A fresh water supply and a safe harbour, which Philip described as "the finest Harbour in the World ... Here a Thousand Sail of the Line may ride in the most perfect Security". The settlement was planned to be a self-sufficient penal colony based on subsistence agriculture. Trade and shipbuilding were banned in order to keep the convicts isolated. However, the soil around the settlement proved poor and
1215-547: A larger variety of literary products in several areas. Angus & Robertson had commenced their work on the Australian Encyclopaedia in 1912. The First World War had then interrupted the progression of the encyclopedia. As a result of the war, the operation behind the Australian Encyclopedia was put on hold. In 1925, the first volume of the encyclopedia had been published and a year later, the second volume
1350-623: A length of less than a meter. Rocks at the depth to be ductilely stretched are often also metamorphosed. These stretched rocks can also pinch into lenses, known as boudins , after the French word for "sausage" because of their visual similarity. Where rock units slide past one another, strike-slip faults develop in shallow regions, and become shear zones at deeper depths where the rocks deform ductilely. The addition of new rock units, both depositionally and intrusively, often occurs during deformation. Faulting and other deformational processes result in
1485-448: A means to provide information about geological history and the timing of geological events. The principle of uniformitarianism states that the geological processes observed in operation that modify the Earth's crust at present have worked in much the same way over geological time. A fundamental principle of geology advanced by the 18th-century Scottish physician and geologist James Hutton
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#17328919038371620-608: A number of fields, laboratory, and numerical modeling methods to decipher Earth history and to understand the processes that occur on and inside the Earth. In typical geological investigations, geologists use primary information related to petrology (the study of rocks), stratigraphy (the study of sedimentary layers), and structural geology (the study of positions of rock units and their deformation). In many cases, geologists also study modern soils, rivers , landscapes , and glaciers ; investigate past and current life and biogeochemical pathways, and use geophysical methods to investigate
1755-597: A pattern of resistance that was to be repeated as the colonial frontier expanded . A military garrison was established on the Hawkesbury in 1795. The death toll from 1794 to 1800 was 26 settlers and up to 200 Darug. Conflict again erupted from 1814 to 1816 with the expansion of the colony into Dharawal country in the Nepean region south-west of Sydney. Following the deaths of several settlers, Governor Macquarie dispatched three military detachments into Dharawal lands, culminating in
1890-479: A planner to design the street layout of Sydney and commissioned the construction of roads, wharves, churches, and public buildings. Parramatta Road , linking Sydney and Parramatta, was opened in 1811, and a road across the Blue Mountains was completed in 1815, opening the way for large-scale farming and grazing west of the Great Dividing Range . Following the departure of Macquarie, official policy encouraged
2025-423: A rich ceremonial life, part of a belief system centring on ancestral, totemic and supernatural beings. People from different clans and language groups came together to participate in initiation and other ceremonies. These occasions fostered trade, marriages and clan alliances. The earliest British settlers recorded the word ' Eora ' as an Aboriginal term meaning either 'people' or 'from this place'. The clans of
2160-451: A sedimentary rock. Sedimentary rocks are mainly divided into four categories: sandstone, shale, carbonate, and evaporite. This group of classifications focuses partly on the size of sedimentary particles (sandstone and shale), and partly on mineralogy and formation processes (carbonation and evaporation). Igneous and sedimentary rocks can then be turned into metamorphic rocks by heat and pressure that change its mineral content, resulting in
2295-561: A severe dust storm towards the city . The Greater Sydney Commission divides Sydney into three "cities" and five "districts" based on the 33 LGAs in the metropolitan area. The "metropolis of three cities" comprises Eastern Harbour City , Central River City and Western Parkland City . The Australian Bureau of Statistics also includes City of Central Coast (the former Gosford City and Wyong Shire) as part of Greater Sydney for population counts, adding 330,000 people. The CBD extends about 3 km (1.9 mi) south from Sydney Cove . It
2430-493: A single environment and do not necessarily occur in a single order. The Hawaiian Islands , for example, consist almost entirely of layered basaltic lava flows. The sedimentary sequences of the mid-continental United States and the Grand Canyon in the southwestern United States contain almost-undeformed stacks of sedimentary rocks that have remained in place since Cambrian time. Other areas are much more geologically complex. In
2565-400: A variety of applications. Dating of lava and volcanic ash layers found within a stratigraphic sequence can provide absolute age data for sedimentary rock units that do not contain radioactive isotopes and calibrate relative dating techniques. These methods can also be used to determine ages of pluton emplacement. Thermochemical techniques can be used to determine temperature profiles within
2700-724: A year have temperatures at or above 30 °C (86 °F) in the central business district (CBD). In contrast, the metropolitan area averages between 35 and 65 days, depending on the suburb. The hottest day in the metropolitan area occurred in Penrith on 4 January 2020, where a high of 48.9 °C (120.0 °F) was recorded. The average annual temperature of the sea ranges from 18.5 °C (65.3 °F) in September to 23.7 °C (74.7 °F) in February. Sydney has an average of 7.2 hours of sunshine per day and 109.5 clear days annually. Due to
2835-559: Is a national representation of the defining aspects of Australia. This includes information related to the nation's history, the geography of Australia and information regarding the Aboriginal people. When the encyclopedia was first established (1925-1926), it consisted of 2 volumes and was originally published by Angus & Robertson in New South Wales. The second edition, published in 1958, was then extended to 10 volumes. Four years later,
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#17328919038372970-422: Is accomplished in two primary ways: through faulting and folding . In the shallow crust, where brittle deformation can occur, thrust faults form, which causes the deeper rock to move on top of the shallower rock. Because deeper rock is often older, as noted by the principle of superposition , this can result in older rocks moving on top of younger ones. Movement along faults can result in folding, either because
3105-460: Is an intimate coupling between the movement of the plates on the surface and the convection of the mantle (that is, the heat transfer caused by the slow movement of ductile mantle rock). Thus, oceanic parts of plates and the adjoining mantle convection currents always move in the same direction – because the oceanic lithosphere is actually the rigid upper thermal boundary layer of the convecting mantle. This coupling between rigid plates moving on
3240-528: Is bordered by Farm Cove within the Royal Botanic Garden to the east and Darling Harbour to the west. Suburbs surrounding the CBD include Woolloomooloo and Potts Point to the east, Surry Hills and Darlinghurst to the south, Pyrmont and Ultimo to the west, and Millers Point and The Rocks to the north. Most of these suburbs measure less than 1 km (0.4 sq mi) in area. The Sydney CBD
3375-451: Is characterised by narrow streets and thoroughfares, created in its convict beginnings. Several localities, distinct from suburbs, exist throughout Sydney's inner reaches. Central and Circular Quay are transport hubs with ferry, rail, and bus interchanges. Chinatown , Darling Harbour, and Kings Cross are important locations for culture, tourism, and recreation. The Strand Arcade , located between Pitt Street Mall and George Street ,
3510-433: Is horizontal). The principle of superposition states that a sedimentary rock layer in a tectonically undisturbed sequence is younger than the one beneath it and older than the one above it. Logically a younger layer cannot slip beneath a layer previously deposited. This principle allows sedimentary layers to be viewed as a form of the vertical timeline, a partial or complete record of the time elapsed from deposition of
3645-616: Is important for mineral and hydrocarbon exploration and exploitation, evaluating water resources , understanding natural hazards , remediating environmental problems, and providing insights into past climate change . Geology is a major academic discipline , and it is central to geological engineering and plays an important role in geotechnical engineering . The majority of geological data comes from research on solid Earth materials. Meteorites and other extraterrestrial natural materials are also studied by geological methods. Minerals are naturally occurring elements and compounds with
3780-478: Is primarily accomplished through normal faulting and through the ductile stretching and thinning. Normal faults drop rock units that are higher below those that are lower. This typically results in younger units ending up below older units. Stretching of units can result in their thinning. In fact, at one location within the Maria Fold and Thrust Belt , the entire sedimentary sequence of the Grand Canyon appears over
3915-568: Is that "the present is the key to the past." In Hutton's words: "the past history of our globe must be explained by what can be seen to be happening now." The principle of intrusive relationships concerns crosscutting intrusions. In geology, when an igneous intrusion cuts across a formation of sedimentary rock , it can be determined that the igneous intrusion is younger than the sedimentary rock. Different types of intrusions include stocks, laccoliths , batholiths , sills and dikes . The principle of cross-cutting relationships pertains to
4050-523: Is used for geologically young materials containing organic carbon . The geology of an area changes through time as rock units are deposited and inserted, and deformational processes alter their shapes and locations. Rock units are first emplaced either by deposition onto the surface or intrusion into the overlying rock . Deposition can occur when sediments settle onto the surface of the Earth and later lithify into sedimentary rock, or when as volcanic material such as volcanic ash or lava flows blanket
4185-454: The Appin massacre (April 1816) in which at least 14 Aboriginal people were killed. The New South Wales Legislative Council became a semi-elected body in 1842. Sydney was declared a city the same year, and a governing council established, elected on a restrictive property franchise. The discovery of gold in New South Wales and Victoria in 1851 initially caused economic disruption as men moved to
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4320-522: The Australian Encyclopedia a year later when the first volume was titled The Illustrated Australian Encyclopedia . Jose was collaborating with entomologist, Herbert James Carter, with the editing of Australian Encyclopedia . Carter's responsibilities were centred around the scientific aspects of the encyclopedia leaving the remaining work to be edited by Jose. The second volume of the Australian Encyclopedia had not been edited yet when Jose left
4455-455: The Australian raven , Australian magpie , crested pigeon , noisy miner and the pied currawong . Introduced bird species ubiquitously found in Sydney are the common myna , common starling , house sparrow and the spotted dove . Reptile species are also numerous and predominantly include skinks . Sydney has a few mammal and spider species, such as the grey-headed flying fox and
4590-459: The Cooks River into Botany Bay. There is no single definition of the boundaries of Sydney. The Australian Statistical Geography Standard definition of Greater Sydney covers 12,369 km (4,776 sq mi) and includes the local government areas of Central Coast in the north, Hawkesbury in the north-west, Blue Mountains in the west, Sutherland Shire in the south, and Wollondilly in
4725-485: The Garden Island Tunnel System , the only tunnel warfare complex in Sydney, and the heritage-listed military fortification systems Bradleys Head Fortification Complex and Middle Head Fortifications , which were part of a total defence system for Sydney Harbour . A post-war immigration and baby boom saw a rapid increase in Sydney's population and the spread of low-density housing in suburbs throughout
4860-631: The Middle East and Africa becoming major sources. By 2021, the population of Sydney was over 5.2 million, with 40% of the population born overseas. China and India overtook England as the largest source countries for overseas-born residents. Sydney is a coastal basin with the Tasman Sea to the east, the Blue Mountains to the west, the Hawkesbury River to the north, and the Woronora Plateau to
4995-754: The Pacific Ocean in the east to the Blue Mountains in the west, and about 80 km (50 mi) from the Ku-ring-gai Chase National Park and the Hawkesbury River in the north and north-west, to the Royal National Park and Macarthur in the south and south-west. Greater Sydney consists of 658 suburbs, spread across 33 local government areas. Residents of the city are colloquially known as "Sydneysiders". The estimated population in June 2023
5130-649: The Sydney funnel-web , respectively, and has a huge diversity of marine species inhabiting its harbour and beaches. Under the Köppen–Geiger classification , Sydney has a humid subtropical climate ( Cfa ) with "warm, sometimes hot" summers and "generally mild", to "cool" winters. The El Niño–Southern Oscillation , the Indian Ocean Dipole and the Southern Annular Mode play an important role in determining Sydney's weather patterns: drought and bushfire on
5265-639: The University of New South Wales are ranked 18th and 19th in the world respectively. Sydney has hosted major international sporting events such as the 2000 Summer Olympics , the 2003 Rugby World Cup Final , and the 2023 FIFA Women's World Cup Final . The city is among the top fifteen most-visited, with millions of tourists coming each year to see the city's landmarks. The city has over 1,000,000 ha (2,500,000 acres) of nature reserves and parks , and its notable natural features include Sydney Harbour and Royal National Park . The Sydney Harbour Bridge and
5400-602: The University of Sydney (1854–61), the Australian Museum (1858–66), the Town Hall (1868–88), and the General Post Office (1866–92). Elaborate coffee palaces and hotels were erected. Daylight bathing at Sydney's beaches was banned, but segregated bathing at designated ocean baths was popular. Drought, the winding down of public works and a financial crisis led to economic depression in Sydney throughout most of
5535-500: The bedrock . This study is often known as Quaternary geology , after the Quaternary period of geologic history, which is the most recent period of geologic time. Magma is the original unlithified source of all igneous rocks . The active flow of molten rock is closely studied in volcanology , and igneous petrology aims to determine the history of igneous rocks from their original molten source to their final crystallization. In
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5670-512: The geochemical evolution of rock units. Petrologists can also use fluid inclusion data and perform high temperature and pressure physical experiments to understand the temperatures and pressures at which different mineral phases appear, and how they change through igneous and metamorphic processes. This research can be extrapolated to the field to understand metamorphic processes and the conditions of crystallization of igneous rocks. This work can also help to explain processes that occur within
5805-402: The mantle below (separated within itself by seismic discontinuities at 410 and 660 kilometers), and the outer core and inner core below that. More recently, seismologists have been able to create detailed images of wave speeds inside the earth in the same way a doctor images a body in a CT scan . These images have led to a much more detailed view of the interior of the Earth, and have replaced
5940-642: The "Aborigines of Australia" declared 26 January "A Day of Mourning " for "the whiteman's seizure of our country." With the outbreak of Second World War in 1939, Sydney experienced a surge in industrial development. Unemployment virtually disappeared and women moved into jobs previously typically reserved for males. Sydney was attacked by Japanese submarines in May and June 1942 with 21 killed. Households built air raid shelters and performed drills. Military establishments in response to World War II in Australia included
6075-610: The 1890s. Meanwhile, the Sydney-based premier of New South Wales, George Reid , became a key figure in the process of federation. When the six colonies federated on 1 January 1901, Sydney became the capital of the State of New South Wales. The spread of bubonic plague in 1900 prompted the state government to modernise the wharves and demolish inner-city slums. The outbreak of the First World War in 1914 saw more Sydney males volunteer for
6210-440: The 1960s, it was discovered that the Earth's lithosphere , which includes the crust and rigid uppermost portion of the upper mantle , is separated into tectonic plates that move across the plastically deforming, solid, upper mantle, which is called the asthenosphere . This theory is supported by several types of observations, including seafloor spreading and the global distribution of mountain terrain and seismicity. There
6345-452: The Australian Encyclopedia. The first edition of the Australian Encyclopedia consisted of 2 volumes. The Australian Encyclopedia had then expanded in 1958 with the second edition featuring an additional 8 volumes. This 10 volume edition explores 6,200 subjects which are supported by over 2,000 illustrations and are all discussed with within 4,500,000 words. Within the encyclopedia, there are 2,200 biographies, 1,400 entries regarding geography and
6480-557: The CBD. In the warm season black nor'easters are usually the cause of heavy rain events, though other forms of low-pressure areas , including remnants of ex-cyclones , may also bring heavy deluge and afternoon thunderstorms. 'Snow' was last alleged in 1836, more than likely a fall of graupel , or soft hail; and in July 2008 the Upper North Shore saw a fall of graupel that was mistaken by many for 'snow'. In 2009, dry conditions brought
6615-473: The Cumberland Plain. Immigrants—mostly from Britain and continental Europe—and their children accounted for over three-quarters of Sydney's population growth between 1947 and 1971. The newly created Cumberland County Council oversaw low-density residential developments, the largest at Green Valley and Mount Druitt . Older residential centres such as Parramatta, Bankstown and Liverpool became suburbs of
6750-465: The Earth on and beneath its surface and the processes that have shaped that structure. Geologists study the mineralogical composition of rocks in order to get insight into their history of formation. Geology determines the relative ages of rocks found at a given location; geochemistry (a branch of geology) determines their absolute ages . By combining various petrological, crystallographic, and paleontological tools, geologists are able to chronicle
6885-424: The Earth, such as subduction and magma chamber evolution. Structural geologists use microscopic analysis of oriented thin sections of geological samples to observe the fabric within the rocks, which gives information about strain within the crystalline structure of the rocks. They also plot and combine measurements of geological structures to better understand the orientations of faults and folds to reconstruct
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#17328919038377020-478: The Grand Canyon in the southwestern United States being a very visible example, the lower rock units were metamorphosed and deformed, and then deformation ended and the upper, undeformed units were deposited. Although any amount of rock emplacement and rock deformation can occur, and they can occur any number of times, these concepts provide a guide to understanding the geological history of an area. Geologists use
7155-792: The Inner West and Northern Sydney , the Eastern Suburbs Banksia Scrub in the coastline and the Blue Gum High Forest scantily present in the North Shore – all of which are critically endangered. The city also includes the Sydney Sandstone Ridgetop Woodland found in Ku-ring-gai Chase National Park on the Hornsby Plateau to the north. Sydney is home to dozens of bird species, which commonly include
7290-577: The Sydney area occupied land with traditional boundaries. There is debate, however, about which group or nation these clans belonged to, and the extent of differences in language and rites. The major groups were the coastal Eora people, the Dharug (Darug) occupying the inland area from Parramatta to the Blue Mountains, and the Dharawal people south of Botany Bay. Darginung and Gundungurra languages were spoken on
7425-442: The Sydney region are grassy woodlands (i.e. savannas ) and some pockets of dry sclerophyll forests, which consist of eucalyptus trees, casuarinas , melaleucas , corymbias and angophoras , with shrubs (typically wattles , callistemons , grevilleas and banksias ), and a semi-continuous grass in the understory . The plants in this community tend to have rough, spiky leaves due to low soil fertility . Sydney also features
7560-621: The Union Jack 165 years earlier, commencing her Australian Royal Tour . It was the first time a reigning monarch stepped onto Australian soil. Increasing high-rise development in Sydney and the expansion of suburbs beyond the "green belt" envisaged by the planners of the 1950s resulted in community protests. In the early 1970s, trade unions and resident action groups imposed green bans on development projects in historic areas such as The Rocks. Federal, State and local governments introduced heritage and environmental legislation. The Sydney Opera House
7695-702: The United Kingdom, Vietnam and the Philippines. Despite being one of the most expensive cities in the world, Sydney frequently ranks in the top ten most liveable cities . It is classified as an Alpha+ city by the Globalization and World Cities Research Network , indicating its influence in the region and throughout the world. Ranked eleventh in the world for economic opportunity, Sydney has an advanced market economy with strengths in education, finance, manufacturing and tourism . The University of Sydney and
7830-548: The World Heritage-listed Sydney Opera House are major tourist attractions. Central Station is the hub of Sydney's suburban train, metro and light rail networks and longer-distance services. The main passenger airport serving the city is Kingsford Smith Airport , one of the world's oldest continually operating airports. In 1788, Captain Arthur Phillip , the first governor of New South Wales, named
7965-561: The allocation of his editor in chief role and the publication of the Australian Encyclopedia , Jose spent many years as a reader for the Angus & Robertson corporation. Despite Jose never practising law, in 1891 he was granted admission to the Bar. Following the publication of his writing, The Growth of the Empire, in 1897, Jose went on to writing many more published articles, books and chapters, he acquired
8100-475: The armed forces than the Commonwealth authorities could process, and helped reduce unemployment. Those returning from the war in 1918 were promised "homes fit for heroes" in new suburbs such as Daceyville and Matraville. "Garden suburbs" and mixed industrial and residential developments also grew along the rail and tram corridors. The population reached one million in 1926, after Sydney had regained its position as
8235-563: The arrival of the British, there were 4,000 to 8,000 Aboriginal people in the greater Sydney region. The inhabitants subsisted on fishing, hunting, and gathering plants and shellfish. The diet of the coastal clans was more reliant on seafood whereas hinterland clans ate more forest animals and plants. The clans had distinctive equipment and weapons mostly made of stone, wood, plant materials, bone and shell. They also differed in their body decorations, hairstyles, songs and dances. Aboriginal clans had
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#17328919038378370-408: The beginning of his family's financial loss. This included cutting wood, making bricks, picking apples and tutoring. In 1885, Jose had commenced his career as an assistant master at a Bathurst college in New South Wales, All Saints’ College. After multiple edits and writings of songs and articles, Jose had soon become an extension lecturer at a university and a writer for several verses in 1888. Prior to
8505-537: The beginning of the 20th century, advancement in geological science was facilitated by the ability to obtain accurate absolute dates to geological events using radioactive isotopes and other methods. This changed the understanding of geological time. Previously, geologists could only use fossils and stratigraphic correlation to date sections of rock relative to one another. With isotopic dates, it became possible to assign absolute ages to rock units, and these absolute dates could be applied to fossil sequences in which there
8640-422: The coastal region. The rising sea level between 18,000 and 6,000 years ago flooded the rias to form estuaries and deep harbours. Port Jackson, better known as Sydney Harbour, is one such ria . Sydney features two major soil types: sandy soils (which originate from the Hawkesbury sandstone) and clay (which are from shales and volcanic rocks ), though some soils may be a mixture of the two. Directly overlying
8775-506: The collection of Moir had begun to be transferred to the Public Library of Victoria. In addition to the errors within the second edition, there was information that was moderated despite the expansion of the volumes within the new edition of the Australian Encyclopedia. The first edition accounted for the Wrecks and Shipping Disasters in the form of a list. This list was reviewed and altered for
8910-473: The cove where the first British settlement was established Sydney Cove after Home Secretary Thomas Townshend, 1st Viscount Sydney . The cove was called Warrane by the Aboriginal inhabitants. Phillip considered naming the settlement Albion , but this name was never officially used. By 1790 Phillip and other officials were regularly calling the township Sydney. Sydney was declared a city in 1842. The Gadigal (Cadigal) clan, whose territory stretches along
9045-515: The creation of topographic gradients, causing material on the rock unit that is increasing in elevation to be eroded by hillslopes and channels. These sediments are deposited on the rock unit that is going down. Continual motion along the fault maintains the topographic gradient in spite of the movement of sediment and continues to create accommodation space for the material to deposit. Deformational events are often also associated with volcanism and igneous activity. Volcanic ashes and lavas accumulate on
9180-437: The crust, the uplift of mountain ranges, and paleo-topography. Fractionation of the lanthanide series elements is used to compute ages since rocks were removed from the mantle. Other methods are used for more recent events. Optically stimulated luminescence and cosmogenic radionuclide dating are used to date surfaces and/or erosion rates. Dendrochronology can also be used for the dating of landscapes. Radiocarbon dating
9315-530: The demolition of buildings erected on Crown land, including some owned by past and serving military officers. The resulting conflict culminated in the Rum Rebellion of 1808, in which Bligh was deposed by the New South Wales Corps . Governor Lachlan Macquarie (1810–1821) played a leading role in the development of Sydney and New South Wales, establishing a bank, a currency and a hospital. He employed
9450-480: The eastern coast of Australia, making landfall at Botany Bay . In 1788, the First Fleet of convicts , led by Arthur Phillip , founded Sydney as a British penal colony , the first European settlement in Australia. After World War II, Sydney experienced mass migration and by 2021 over 40 per cent of the population was born overseas. Foreign countries of birth with the greatest representation are mainland China, India,
9585-516: The emigration of free British settlers to New South Wales. Immigration to the colony increased from 900 free settlers in 1826–30 to 29,000 in 1836–40, many of whom settled in Sydney. By the 1840s Sydney exhibited a geographic divide between poor and working-class residents living west of the Tank Stream in areas such as The Rocks , and the more affluent residents living to its east. Free settlers, free-born residents and former convicts now represented
9720-458: The encyclopedia was under the responsibility of the Grolier Society of Australia. Following this change, the second edition of the encyclopedia had undergone many reprintings due to minor adjustments up until 1972. Subsequently, the third edition was then published in 1977 and consisted of 6 volumes; the fourth edition, featuring 12 volumes, was published in 1983; the fifth edition with 9 volumes
9855-460: The encyclopedia, as well as the detailed analysis of Australia's geography, mineral assets and Australian animal and plant life. The first edition of the Australian Encyclopedia had commenced in 1912 and was published over a decade later. The second edition had significantly enlarged, volume wise, in order to adequately measure up to the developing subject matter. The editor in chief at the time, Alexander (Alec) Hugh Chisholm, provides an explanation for
9990-429: The entries in the earlier encyclopedia on such subjects as mammals, birds, fishes, insects and plants, though authoritative in their period, have had to be written anew ”. That is, the extension is justified by the progress and advancements made within industries and science since the first World War. Given that Australia shares and contributes towards this advancement, it is appropriate to formally acknowledge this within
10125-481: The expansion of the Australian Encyclopedia: “ Science and industry have made remarkable progress since World War I and Australia has shared fully in this advancement. Industry throughout the Commonwealth was stimulated by the impact of World War II and the impetus has since been continued. Moreover, knowledge has broadened considerably in zoology, botany and kindred subjects- so much so, indeed, that most of
10260-570: The fault is a normal fault or a thrust fault . The principle of inclusions and components states that, with sedimentary rocks, if inclusions (or clasts ) are found in a formation, then the inclusions must be older than the formation that contains them. For example, in sedimentary rocks, it is common for gravel from an older formation to be ripped up and included in a newer layer. A similar situation with igneous rocks occurs when xenoliths are found. These foreign bodies are picked up as magma or lava flows, and are incorporated, later to cool in
10395-403: The faults are not planar or because rock layers are dragged along, forming drag folds as slip occurs along the fault. Deeper in the Earth, rocks behave plastically and fold instead of faulting. These folds can either be those where the material in the center of the fold buckles upwards, creating " antiforms ", or where it buckles downwards, creating " synforms ". If the tops of the rock units within
10530-693: The first crops failed, leading to several years of hunger and strict rationing. The food crisis was relieved with the arrival of the Second Fleet in mid-1790 and the Third Fleet in 1791. Former convicts received small grants of land, and government and private farms spread to the more fertile lands around Parramatta , Windsor and Camden on the Cumberland Plain . By 1804, the colony was self-sufficient in food. A smallpox epidemic in April 1789 killed about half
10665-472: The flora and fauna aspect of the encyclopedia are covered by 1,600 articles. Despite the encyclopedia claiming to revolve around the nation of Australia as a continent, it also includes New Zealand and the Australian territories. The majority of the articles featured in the second edition of the Australian Encyclopedia are dedicated to history, geography and natural science. Furthermore, unlike the alphabetising of
10800-483: The folds remain pointing upwards, they are called anticlines and synclines , respectively. If some of the units in the fold are facing downward, the structure is called an overturned anticline or syncline, and if all of the rock units are overturned or the correct up-direction is unknown, they are simply called by the most general terms, antiforms, and synforms. Even higher pressures and temperatures during horizontal shortening can cause both folding and metamorphism of
10935-404: The formation of faults and the age of the sequences through which they cut. Faults are younger than the rocks they cut; accordingly, if a fault is found that penetrates some formations but not those on top of it, then the formations that were cut are older than the fault, and the ones that are not cut must be younger than the fault. Finding the key bed in these situations may help determine whether
11070-461: The fringes of the Sydney area. The first meeting between Aboriginals and British explorers occurred on 29 April 1770 when Lieutenant James Cook landed at Botany Bay (Kamay ) and encountered the Gweagal clan. Two Gweagal men opposed the landing party and one was shot and wounded. Cook and his crew stayed at Botany Bay for a week, collecting water, timber, fodder and botanical specimens and exploring
11205-457: The general headings in the first edition of the Australian Encyclopedia, the second edition alphabetises its featured articles under specific headings. Deputy Principal Librarian of the State Library of New South Wales, Gordan Dalyell Richardson, critically analyses the Australian Encyclopedia within his review by exploring the structure, interpretations, and content. Richardson (1959) discusses
11340-579: The geological history of the Earth as a whole. One aspect is to demonstrate the age of the Earth . Geology provides evidence for plate tectonics , the evolutionary history of life , and the Earth's past climates . Geologists broadly study the properties and processes of Earth and other terrestrial planets. Geologists use a wide variety of methods to understand the Earth's structure and evolution, including fieldwork , rock description , geophysical techniques , chemical analysis , physical experiments , and numerical modelling . In practical terms, geology
11475-700: The goldfields. Melbourne soon overtook Sydney as Australia's largest city, leading to an enduring rivalry between the two. However, increased immigration from overseas and wealth from gold exports increased demand for housing, consumer goods, services and urban amenities. The New South Wales government also stimulated growth by investing heavily in railways, trams, roads, ports, telegraph, schools and urban services. The population of Sydney and its suburbs grew from 95,600 in 1861 to 386,900 in 1891. The city developed many of its characteristic features. The growing population packed into rows of terrace houses in narrow streets. New public buildings of sandstone abounded, including at
11610-453: The history of rock deformation in the area. In addition, they perform analog and numerical experiments of rock deformation in large and small settings. Sydney This is an accepted version of this page Sydney is the capital city of the state of New South Wales and the most populous city in Australia . Located on Australia's east coast, the metropolis surrounds Sydney Harbour and extends about 80 km (50 mi) from
11745-505: The inland location, frost is recorded early in the morning in Western Sydney a few times in winter. Autumn and spring are the transitional seasons, with spring showing a larger temperature variation than autumn. Sydney experiences an urban heat island effect. This makes certain parts of the city more vulnerable to extreme heat, including coastal suburbs. In late spring and summer, temperatures over 35 °C (95 °F) are not uncommon, though hot, dry conditions are usually ended by
11880-423: The internal composition and structure of the Earth. Seismologists can use the arrival times of seismic waves to image the interior of the Earth. Early advances in this field showed the existence of a liquid outer core (where shear waves were not able to propagate) and a dense solid inner core . These advances led to the development of a layered model of the Earth, with a lithosphere (including crust) on top,
12015-459: The later end of the scale, it is marked by the present day (in the Holocene epoch ). The following five timelines show the geologic time scale to scale. The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon. The second timeline shows an expanded view of the most recent eon. In a similar way, the most recent era is expanded in
12150-454: The lowest layer to deposition of the highest bed. The principle of faunal succession is based on the appearance of fossils in sedimentary rocks. As organisms exist during the same period throughout the world, their presence or (sometimes) absence provides a relative age of the formations where they appear. Based on principles that William Smith laid out almost a hundred years before the publication of Charles Darwin 's theory of evolution ,
12285-552: The main body of insurgents were routed by about 100 troops and volunteers at Rouse Hill . At least 39 convicts were killed in the uprising and subsequent executions. As the colony spread to the more fertile lands around the Hawkesbury River , north-west of Sydney, conflict between the settlers and the Darug people intensified, reaching a peak from 1794 to 1810. Bands of Darug people, led by Pemulwuy and later by his son Tedbury , burned crops, killed livestock and raided settler stores in
12420-430: The main standards of work from a librarian's perspective, that being authenticity, usage, and up-to-datedness. Following Richardson's (1959) explanation of authenticity, the second edition of the Australian Encyclopedia was shown to exhibit multiple errors, thus threatening its quality and validity. Richardson (1959) discusses some examples such as the libraries articles. For example, the second edition claims that R.C Walker
12555-493: The mantle and show the crystallographic structures expected in the inner core of the Earth. The geological time scale encompasses the history of the Earth. It is bracketed at the earliest by the dates of the first Solar System material at 4.567 Ga (or 4.567 billion years ago) and the formation of the Earth at 4.54 Ga (4.54 billion years), which is the beginning of the Hadean eon – a division of geological time. At
12690-405: The matrix. As a result, xenoliths are older than the rock that contains them. The principle of original horizontality states that the deposition of sediments occurs as essentially horizontal beds. Observation of modern marine and non-marine sediments in a wide variety of environments supports this generalization (although cross-bedding is inclined, the overall orientation of cross-bedded units
12825-457: The metropolis. Manufacturing, protected by high tariffs, employed over a third of the workforce from 1945 to the 1960s. However, as the long post-war economic boom progressed, retail and other service industries became the main source of new jobs. An estimated one million onlookers, most of the city's population, watched Queen Elizabeth II land in 1954 at Farm Cove where Captain Phillip had raised
12960-518: The most famous. The Nepean River wraps around the western edge of the city and becomes the Hawkesbury River before reaching Broken Bay . Most of Sydney's water storages can be found on tributaries of the Nepean River. The Parramatta River is mostly industrial and drains a large area of Sydney's western suburbs into Port Jackson. The southern parts of the city are drained by the Georges River and
13095-527: The most populous city in Australia. The government created jobs with massive public projects such as the electrification of the Sydney rail network and building the Sydney Harbour Bridge. Sydney was more severely affected by the Great Depression of the 1930s than regional New South Wales or Melbourne. New building almost came to a standstill, and by 1933 the unemployment rate for male workers
13230-461: The nation. The third edition was edited by Bruce Pratt. Richard Appleton became editor-in-chief in 1977 and oversaw the fourth and fifth editions. The 3rd and 4th editions were published by the Grolier Society of Australia . The 5th and 6th editions were published by Australian Geographic . For a critical review of the first edition: Geology Geology describes the structure of
13365-543: The navy. The First Fleet of 11 ships under the command of Captain Arthur Phillip arrived in Botany Bay in January 1788. It comprised more than a thousand settlers, including 736 convicts. The fleet soon moved to the more suitable Port Jackson where a settlement was established at Sydney Cove on 26 January 1788. The colony of New South Wales was formally proclaimed by Governor Phillip on 7 February 1788. Sydney Cove offered
13500-628: The older Hawkesbury sandstone is the Wianamatta shale , a geological feature found in western Sydney that was deposited in connection with a large river delta during the Middle Triassic . The Wianamatta shale generally comprises fine grained sedimentary rocks such as shales, mudstones , ironstones , siltstones and laminites , with less common sandstone units. The Wianamatta Group is made up of Bringelly Shale , Minchinbury Sandstone and Ashfield Shale . The most prevalent plant communities in
13635-569: The one hand, and storms and flooding on the other, associated with the opposite phases of the oscillation in Australia . The weather is moderated by proximity to the ocean, and more extreme temperatures are recorded in the inland western suburbs because Sydney CBD is more affected by the oceanic climate drivers than the western suburbs. At Sydney's primary weather station at Observatory Hill , extreme temperatures have ranged from 45.8 °C (114.4 °F) on 18 January 2013 to 2.1 °C (35.8 °F) on 22 June 1932. An average of 14.9 days
13770-413: The primary record of the majority of the geological history of the Earth. There are three major types of rock: igneous , sedimentary , and metamorphic . The rock cycle illustrates the relationships among them (see diagram). When a rock solidifies or crystallizes from melt ( magma or lava ), it is an igneous rock . This rock can be weathered and eroded , then redeposited and lithified into
13905-569: The principles of succession developed independently of evolutionary thought. The principle becomes quite complex, however, given the uncertainties of fossilization, localization of fossil types due to lateral changes in habitat ( facies change in sedimentary strata), and that not all fossils formed globally at the same time. Geologists also use methods to determine the absolute age of rock samples and geological events. These dates are useful on their own and may also be used in conjunction with relative dating methods or to calibrate relative methods. At
14040-439: The publishing company, Angus & Robertson, in 1925. One of the founders of Angus & Robertson, David Mackenzie Angus (1855-1901), had originally ventured into Australian literature when he had opened his Sydney bookstore in 1884. Two years later, Angus partnered with George Robertson and another two years later, their establishment had commenced publishing. The incorporation of publishing had resulted in profitable success and
14175-604: The region's Indigenous population. In November 1790 Bennelong led a group of survivors of the Sydney clans into the settlement, establishing a continuous presence of Aboriginal Australians in settled Sydney. Phillip had been given no instructions for urban development, but in July 1788 submitted a plan for the new town at Sydney Cove . It included a wide central avenue, a permanent Government House, law courts, hospital and other public buildings, but no provision for warehouses, shops, or other commercial buildings. Phillip promptly ignored his own plan, and unplanned development became
14310-428: The rocks. This metamorphism causes changes in the mineral composition of the rocks; creates a foliation , or planar surface, that is related to mineral growth under stress. This can remove signs of the original textures of the rocks, such as bedding in sedimentary rocks, flow features of lavas , and crystal patterns in crystalline rocks . Extension causes the rock units as a whole to become longer and thinner. This
14445-602: The role of professor in modern history and English in Aligarh at the Mohammedan Anglo-Oriental College and a lecturer in England. In 1904, Jose had arrived back in Sydney as a Times correspondent. The first edition of the Australian Encyclopedia was disrupted due to the war in 1914, therefore delaying its publication. Jose was employed by George Robertson for the encyclopedia full-time and was named editor-in-chief of
14580-502: The second edition. The second edition exhibited the list alphabetically based on the ship's titles. This list is located independently before the index in volume 10 and is less broad and more restricted than the first editions’ portrayal. The encyclopedia was initiated in 1912 as a historical and biographical record under the directorship of Charles H. Bertie , municipal librarian of Sydney . The outbreak of World War I in 1914 temporarily halted its progress. In 1917, work resumed and it
14715-433: The simplified layered model with a much more dynamic model. Mineralogists have been able to use the pressure and temperature data from the seismic and modeling studies alongside knowledge of the elemental composition of the Earth to reproduce these conditions in experimental settings and measure changes within the crystal structure. These studies explain the chemical changes associated with the major seismic discontinuities in
14850-510: The south-west. The local government area of the City of Sydney covers about 26 square kilometres from Garden island in the east to Bicentennial Park in the west, and south to the suburbs of Alexandria and Rosebery . Sydney is made up of mostly Triassic rock with some recent igneous dykes and volcanic necks (typically found in the Prospect dolerite intrusion , west of Sydney). The Sydney Basin
14985-529: The south. Sydney spans two geographic regions. The Cumberland Plain lies to the south and west of the Harbour and is relatively flat. The Hornsby Plateau is located to the north and is dissected by steep valleys. The flat areas of the south were the first to be developed; it was not until the construction of the Sydney Harbour Bridge that the northern reaches became more heavily populated. Seventy surf beaches can be found along its coastline, with Bondi Beach being
15120-442: The southern shore of Port Jackson from South Head to Darling Harbour , are the traditional owners of the land on which the British settlement was initially established, and call their territory Gadi ( Cadi ). Aboriginal clan names within the Sydney region were often formed by adding the suffix "-gal" to a word denoting the name for their territory, a specific place in their territory, a food source, or totem. Greater Sydney covers
15255-524: The southwestern United States, sedimentary, volcanic, and intrusive rocks have been metamorphosed, faulted, foliated, and folded. Even older rocks, such as the Acasta gneiss of the Slave craton in northwestern Canada , the oldest known rock in the world have been metamorphosed to the point where their origin is indiscernible without laboratory analysis. In addition, these processes can occur in stages. In many places,
15390-550: The subsurface. Sub-specialities of geology may distinguish endogenous and exogenous geology. Geological field work varies depending on the task at hand. Typical fieldwork could consist of: In addition to identifying rocks in the field ( lithology ), petrologists identify rock samples in the laboratory. Two of the primary methods for identifying rocks in the laboratory are through optical microscopy and by using an electron microprobe . In an optical mineralogy analysis, petrologists analyze thin sections of rock samples using
15525-407: The surface of the Earth and the convecting mantle is called plate tectonics . The development of plate tectonics has provided a physical basis for many observations of the solid Earth . Long linear regions of geological features are explained as plate boundaries: Plate tectonics has provided a mechanism for Alfred Wegener 's theory of continental drift , in which the continents move across
15660-488: The surface of the Earth over geological time. They also provided a driving force for crustal deformation, and a new setting for the observations of structural geology. The power of the theory of plate tectonics lies in its ability to combine all of these observations into a single theory of how the lithosphere moves over the convecting mantle. Advances in seismology , computer modeling , and mineralogy and crystallography at high temperatures and pressures give insights into
15795-474: The surface, and igneous intrusions enter from below. Dikes , long, planar igneous intrusions, enter along cracks, and therefore often form in large numbers in areas that are being actively deformed. This can result in the emplacement of dike swarms , such as those that are observable across the Canadian shield, or rings of dikes around the lava tube of a volcano. All of these processes do not necessarily occur in
15930-742: The surface. Igneous intrusions such as batholiths , laccoliths , dikes , and sills , push upwards into the overlying rock, and crystallize as they intrude. After the initial sequence of rocks has been deposited, the rock units can be deformed and/or metamorphosed . Deformation typically occurs as a result of horizontal shortening, horizontal extension , or side-to-side ( strike-slip ) motion. These structural regimes broadly relate to convergent boundaries , divergent boundaries , and transform boundaries, respectively, between tectonic plates. When rock units are placed under horizontal compression , they shorten and become thicker. Because rock units, other than muds, do not significantly change in volume , this
16065-527: The surrounding area. Cook sought to establish relations with the Aboriginal population without success. Britain had been sending convicts to its American colonies for most of the eighteenth century, and the loss of these colonies in 1783 was the impetus to establish a penal colony at Botany Bay. Proponents of colonisation also pointed to the strategic importance of a new base in the Asia-Pacific region and its potential to provide much-needed timber and flax for
16200-439: The temperature seem colder than it actually is . Rainfall has a moderate to low variability and has historically been fairly uniform throughout the year, although in recent years it has been more summer-dominant and erratic. Precipitation is usually higher in summer through to autumn, and lower in late winter to early spring. In late autumn and winter, east coast lows may bring large amounts of rainfall, especially in
16335-407: The third timeline, the most recent period is expanded in the fourth timeline, and the most recent epoch is expanded in the fifth timeline. Horizontal scale is Millions of years (above timelines) / Thousands of years (below timeline) Epochs: Methods for relative dating were developed when geology first emerged as a natural science . Geologists still use the following principles today as
16470-502: The traditional lands of 28 known Aboriginal clans. The first people to inhabit the area now known as Sydney were Aboriginal Australians who had migrated from southeast Asia via northern Australia. Flaked pebbles found in Western Sydney's gravel sediments might indicate human occupation from 45,000 to 50,000 years ago, while radiocarbon dating has shown evidence of human activity in the region from around 30,000 years ago. Prior to
16605-471: The vast majority of the population of Sydney, leading to increasing public agitation for responsible government and an end to transportation. Transportation to New South Wales ceased in 1840. In 1804, Irish convicts led around 300 rebels in the Castle Hill Rebellion , an attempt to march on Sydney, commandeer a ship, and sail to freedom. Poorly armed, and with their leader Philip Cunningham captured,
16740-401: Was 28 per cent, but over 40 per cent in working class areas such as Alexandria and Redfern. Many families were evicted from their homes and shanty towns grew along coastal Sydney and Botany Bay, the largest being "Happy Valley" at La Perouse . The Depression also exacerbated political divisions. In March 1932, when populist Labor premier Jack Lang attempted to open the Sydney Harbour Bridge he
16875-646: Was 5,450,496, which is about 66% of the state's population. The city's nicknames include the Emerald City and the Harbour City . Aboriginal Australians have inhabited the Greater Sydney region for at least 30,000 years, and their engravings and cultural sites are common. The traditional custodians of the land on which modern Sydney stands are the clans of the Darug , Dharawal and Eora peoples. During his first Pacific voyage in 1770, James Cook charted
17010-411: Was also controversial for its cost and disputes between architect Jørn Utzon and government officials. However, soon after it opened in 1973 it became a major tourist attraction and symbol of the city. The progressive reduction in tariff protection from 1974 began the transformation of Sydney from a manufacturing centre to a "world city". From the 1980s, overseas immigration grew rapidly, with Asia ,
17145-526: Was also the chairman of the technical education committee for the school board of Bristol. Following Jose's studies at Balliol College, Oxford, Jose's health had begun to worsen. A year later, 1882, Jose was recovering in Australia. While in Australia, Jose's father was in dire straits financially and had eventually lost his fortune. Following the delivery of this news, Jose turned down a clerical career in Bristol and remained in Australia. Jose tackled many jobs during
17280-615: Was datable material, converting the old relative ages into new absolute ages. For many geological applications, isotope ratios of radioactive elements are measured in minerals that give the amount of time that has passed since a rock passed through its particular closure temperature , the point at which different radiometric isotopes stop diffusing into and out of the crystal lattice . These are used in geochronologic and thermochronologic studies. Common methods include uranium–lead dating , potassium–argon dating , argon–argon dating and uranium–thorium dating . These methods are used for
17415-508: Was decided that the book should also include scientific subjects. Herbert J. Carter, later to be president of the Linnean Society of New South Wales (1925–26) recruited other Australian scientists to work on the encyclopedia. Their contributions were, in many instances, the first summaries of scientific knowledge published in a general reference work in Australia. In 1920 Captain Arthur Jose
17550-503: Was formed in the early Triassic period. The sand that was to become the sandstone of today was laid down between 360 and 200 million years ago. The sandstone has shale lenses and fossil riverbeds. The Sydney Basin bioregion includes coastal features of cliffs, beaches, and estuaries. Deep river valleys known as rias were carved during the Triassic period in the Hawkesbury sandstone of
17685-537: Was published in 1988 and the sixth edition consisted of 8 volumes and was published in 1996. The encyclopedia was sold to the Australian Geographic Society in 1987 prior to the publication of the fifth and sixth edition. Arthur Wilberforce Jose was born in Clifton, England. He was the son of William Wilberforce Jose who was a governor at a university located at the city of Jose's birth, Bristol. Jose's father
17820-498: Was published. Today, Angus & Robertson specialises in publishing, bookselling and printing and have made significant contributions to Australian literature. Within all the editions of the Australian encyclopedia, the encyclopedia explicitly represents Australian life with the consideration of the significant number of investigations and research behind Australia and the people of Australia from past decades. Over 1800 biographical accounts of Australian public figures are covered within
17955-482: Was released from the Australian Navy and became the general editor. He found that, since significant time had elapsed since the project started and newer sources of information were available, it had become necessary to re-write much of the historical and biographical information. Alexander Hugh Chisholm was editor-in-chief of the second edition, published in 1958. It received glowing reviews from newspapers around
18090-407: Was succeeded as New South Wales’ Principal Librarian by Anderson following Walker's death. This appears to be incorrect as the position was succeeded by Anderson four years prior to Walker's death. The articles on libraries in the second edition of the Australian encyclopedia also implies that J.K Moir of Melbourne commenced transferring his work to “the Public Library of that city”. This is an error as
18225-544: Was upstaged by Francis de Groot of the far-right New Guard , who slashed the ribbon with a sabre. In January 1938, Sydney celebrated the Empire Games and the sesquicentenary of European settlement in Australia. One journalist wrote, "Golden beaches. Sun tanned men and maidens...Red-roofed villas terraced above the blue waters of the harbour...Even Melbourne seems like some grey and stately city of Northern Europe compared with Sydney's sub-tropical splendours." A congress of
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