88-520: Little Blue Lake is a water-filled sinkhole (“cenote”) in the Australian state of South Australia located in the state's south-east in the locality of Mount Schank about 20 kilometres (12 mi) south of the municipal seat of Mount Gambier . It is notable locally as a swimming hole and nationally as a cave diving site. It is managed by the District Council of Grant and has been developed as
176-659: A Learning City . The number of international students studying in Adelaide has increased rapidly in recent years to 30,726 in 2015, of which 1,824 were secondary school students. Foreign institutions have been attracted to set up campuses to increase its attractiveness as an education hub. Adelaide is the birthplace of three Nobel laureates, more than any other Australian city : physicist William Lawrence Bragg and pathologists Howard Florey and Robin Warren , all of whom completed secondary and tertiary education at St Peter's College and
264-409: A different water chemistry. It is theorised that these cenotes were formed by the collapse of large underground water-filled chambers following the lowering of sea levels at the most recent Glacial Maximum about 20,000 years ago. The chambers themselves are likely to have been formed by groundwater acidified by gaseous Carbon Dioxide (CO 2 ) rising up through fractures from the magma chambers during
352-413: A four-yearly basis, are responsible for local roads and stormwater management, waste collection, planning and development, fire prevention and hazard management, dog and cat management and control, parking control, public health and food inspections, and other services for their local communities. Councils have the power to raise revenue for their activities, which is mostly achieved through "council rates",
440-601: A major constituent of the fossil record of the first forms of life on Earth. They peaked about 1.25 billion years ago (Ga) and subsequently declined in abundance and diversity, so that by the start of the Cambrian they had fallen to 20% of their peak. The most widely supported explanation is that stromatolite builders fell victim to grazing creatures (the Cambrian substrate revolution ); this theory implies that sufficiently complex organisms were common around 1 Ga. Another hypothesis
528-530: A means of providing shelter and protection from a harsh environment. Lichen stromatolites are a proposed mechanism of formation of some kinds of layered rock structure that are formed above water, where rock meets air, by repeated colonization of the rock by endolithic lichens . Some Archean rock formations show macroscopic similarity to modern microbial structures, leading to the inference that these structures represent evidence of ancient life, namely stromatolites. However, others regard these patterns as being
616-515: A penal colony. Although South Australia was constituted such that convicts could never be transported to the Province, some emancipated or escaped convicts or expirees made their own way there, both prior to 1836, or later, and may have constituted 1–2% of the early population. The plan for the province was that it would be an experiment in reform, addressing the problems perceived in British society. There
704-487: A province or provinces in southern Australia. The act stated that the land between 132° and 141° east longitude and from 26° south latitude to the southern ocean would be allotted to the intended colony, and it would be convict-free. In contrast to the rest of Australia, terra nullius did not apply to the new province. The Letters Patent , which used the enabling provisions of the South Australia Act 1834 to fix
792-531: A recreational and tourism venue. The sinkhole's name is attributed to its similar appearance to Mount Gambier’s much larger volcanic Blue Lake and the property of its water to sometimes turn blue in colour during summer in a similar manner to the Blue Lake . However in more recent times the sinkhole generally remains green in colour throughout most of the year. This is believed by some to be due to groundwater pollution from agricultural fertilizers increasing
880-521: A reserve "for the purposes of a Public Pleasure Resort" under the Crown Lands Act 1929 on 19 March 1986 and placed under "the Care, Control and Management" of the former District Council of Port MacDonnell . The District Council of Grant installed stairs and a floating pontoon in 2002 to improve the lake’s amenity for both residents and visitors after a review of public safety. A parking area also exists on
968-684: A section of the coastline as far east as the Nuyts Archipelago . Thijssen named the whole of the country eastward of the Leeuwin "Nuyts Land", after a distinguished passenger on board; the Hon. Pieter Nuyts , one of the Councillors of India . The coastline of South Australia was first mapped by Matthew Flinders and Nicolas Baudin in 1802, excepting the inlet later named the Port Adelaide River which
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#17330852826191056-723: A tax based on property valuations. Council rates make up about 70% of council revenue, but account for less than 4% of total taxes paid by Australians. As at December 2021 the population of South Australia was 1,806,599. A majority of the state's population lives within Greater Adelaide 's metropolitan area which had an estimated population of 1,333,927 in June 2017. Other significant population centres include Mount Gambier (29,505), Victor Harbor - Goolwa (26,334), Whyalla (21,976), Murray Bridge (18,452), Port Lincoln (16,281), Port Pirie (14,267), and Port Augusta (13,957). At
1144-537: A theory espoused by Edward Gibbon Wakefield that was later employed by the New Zealand Company . The goal was to establish the province as a centre of civilisation for free immigrants, promising civil liberties and religious tolerance. Although its history has been marked by periods of economic hardship, South Australia has remained politically innovative and culturally vibrant. Today, it is known for its fine wine and numerous cultural festivals. The state's economy
1232-634: A unique ecosystem in the Mexican desert. Alchichica Lake in Puebla , Mexico has two distinct morphologic generations of stromatolites: columnar-dome like structures, rich in aragonite , forming near the shore line, dated back to 1,100 years before present (ybp) and spongy-cauliflower like thrombolytic structures that dominate the lake from top to the bottom, mainly composed of hydromagnesite , huntite , calcite and dated back to 2,800 ybp. The only open marine environment where modern stromatolites are known to prosper
1320-510: A well-exposed example of the thrombolite-stromatolite-metazoan reefs that developed during the Proterozoic period, the stromatolites here being better developed in updip locations under conditions of higher current velocities and greater sediment influx. Modern stromatolites are mostly found in hypersaline lakes and marine lagoons where high saline levels prevent animal grazing. One such location where excellent modern specimens can be observed
1408-740: Is Hamelin Pool Marine Nature Reserve , Shark Bay in Western Australia . In 2010, a fifth type of chlorophyll , namely chlorophyll f , was discovered by Min Chen from stromatolites in Shark Bay. Halococcus hamelinensis , a halophilic archaeon , occurs in living stromatolites in Shark Bay where it is exposed to extreme conditions of UV radiation, salinity and desiccation . H. hamelinesis possesses genes that encode enzymes employed in
1496-472: Is also the world's fourth-largest remaining copper deposit, and the world's fifth largest gold deposit. There was a proposal to vastly expand the operations of the mine, making it the largest open-cut mine in the world, but in 2012 the BHP Billiton board decided not to go ahead with it at that time due to then lower commodity prices. The remote town of Coober Pedy produces more opal than anywhere else in
1584-430: Is an active area of research in geology. Multiple morphologies of stromatolites may exist in a single local or geological strata, relating to the specific conditions occurring in different region and water depths. Most stromatolites are spongiostromate in texture, having no recognisable microstructure or cellular remains. A minority are porostromate , having recognisable microstructure; these are mostly unknown from
1672-626: Is dominated by the agricultural, manufacturing and mining industries. Evidence of human activity in South Australia dates back as far as 20,000 years, with flint mining activity and rock art in the Koonalda Cave on the Nullarbor Plain . In addition wooden spears and tools were made in an area now covered in peat bog in the South East. Kangaroo Island was inhabited long before the island
1760-582: Is flanked by the Southern Ocean , but official international consensus defines the Southern Ocean as extending north from the pole only to 60°S or 55°S, at least 17 degrees of latitude further south than the most southern point of South Australia. Thus the south coast is officially adjacent to the south-most portion of the Indian Ocean. See Southern Ocean: Existence and definitions . The southern part of
1848-480: Is suggested as being an indicator of the recent formation of these landforms. Exploration of the lake's underwater environment commenced in the 1950s. The lake’s submerged extent was surveyed by Lewis and Stace in 1980 and by the Cave Divers Association of Australia (CDAA) during the 1990s. The lake is a popular venue for swimming and cave diving. The land which includes the sinkhole was dedicated as
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#17330852826191936-404: Is that protozoa such as foraminifera were responsible for the decline, favoring formation of thrombolites over stromatolites through microscopic bioturbation . Proterozoic stromatolite microfossils (preserved by permineralization in silica) include cyanobacteria and possibly some forms of the eukaryote chlorophytes (that is, green algae ). One genus of stromatolite very common in
2024-625: Is the Exuma Cays in the Bahamas. Laguna de Bacalar in Mexico's southern Yucatán Peninsula has an extensive formation of living giant microbialites (that is, stromatolites or thrombolites). The microbialite bed is over 10 km (6.2 mi) long with a vertical rise of several meters in some areas. These may be the largest sized living freshwater microbialites, or any organism, on Earth. A 1.5 km stretch of reef-forming stromatolites (primarily of
2112-547: Is the Mount Lofty - Flinders Ranges system, which extends north about 800 kilometres (500 mi) from Cape Jervis to the northern end of Lake Torrens . The highest point in the state is not in those ranges; Mount Woodroffe (1,435 metres (4,708 ft)) is in the Musgrave Ranges in the extreme northwest of the state. The south-western portion of the state consists of the sparsely inhabited Nullarbor Plain , fronted by
2200-460: Is the main road between Mount Gambier and the coastal fishing township of Port MacDonnell . The sinkhole is located on crown land in section 963 in the cadastral unit of the Hundred of MacDonnell . The sinkhole’s lake has a diameter of about 50 metres (160 ft), with surrounding vertical/undercut cliffs about 8 metres (26 ft) high. Access to the water’s edge is via an artificial cutting on
2288-710: The Adelaide Hills . Tomatoes , capsicums , cucumbers , brassicas , lettuce and carrots are grown on the Northern Adelaide Plains at Virginia . Almonds , citrus and stone fruit are grown in the Riverland . Potatoes , onions and carrots are grown in the Murray Mallee region. Potatoes are grown on Kangaroo Island . South Australia produces more than half of all Australian wine, including almost 80% of Australia's premium wines. South Australia has
2376-656: The Governor of South Australia as his representative. It is a state of the Commonwealth of Australia . The bicameral Parliament of South Australia consists of the lower house known as the House of Assembly and the upper house known as the Legislative Council . General elections are held every four years, the last being the 2022 election . Initially, the Governor of South Australia held almost total power, derived from
2464-534: The Holocene , living forms are rare. Stromatolites are layered, biochemical, accretionary structures formed in shallow water by the trapping, binding and cementation of sedimentary grains in biofilms (specifically microbial mats), through the action of certain microbial lifeforms, especially cyanobacteria . They exhibit a variety of forms and structures, or morphologies, including conical, stratiform, domal, columnar, and branching types. Stromatolites occur widely in
2552-569: The Hornsdale Wind Farm in South Australia's Mid-North region. At the time of construction in late 2017, it was billed as the largest lithium-ion battery in the world. The Olympic Dam mine near Roxby Downs in northern South Australia is the largest deposit of uranium in the world, possessing more than a third of the world's low-cost recoverable reserves and 70% of Australia's. The mine, owned and operated by BHP , presently accounts for 9% of global uranium production. The Olympic Dam mine
2640-699: The Riverland and the Adelaide Hills . See South Australian wine . South Australia has boundaries with every other Australian mainland state and territory except the Australian Capital Territory and the Jervis Bay Territory . The Western Australia border has a history involving the South Australian government astronomer, G.F. Dodwell, and the Western Australian Government Astronomer , H.B. Curlewis , marking
2728-511: The University of Adelaide . Adelaide is home to research institutes, including the Royal Institution of Australia , established in 2009 as a counterpart to the two-hundred-year-old Royal Institution of Great Britain. Most of the research organisations are clustered in the Adelaide metropolitan area: South Australia is a constitutional monarchy with King Charles III as sovereign, and
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2816-506: The geologic record is Collenia . The connection between grazer and stromatolite abundance is well documented in the younger Ordovician evolutionary radiation ; stromatolite abundance also increased after the Late Ordovician mass extinction and Permian–Triassic extinction event decimated marine animals, falling back to earlier levels as marine animals recovered. Fluctuations in metazoan population and diversity may not have been
2904-534: The 2016 census, 78.2% of the population spoke only English at home. The other languages most commonly spoken at home were Italian (1.7%), Standard Mandarin (1.7%), Greek (1.4%), Vietnamese (1.1%), and Cantonese (0.6%). At the 2016 census , overall 53.9% of responses identified some variant of Christianity . 9% of respondents chose not to state a religion. The most commonly nominated responses were 'No Religion' (35.4%), Catholicism (18%), Anglicanism (10%) and Uniting Church (7.1%). South Australia
2992-417: The 2016 census, the most commonly nominated ancestries were: 28.9% of the population was born overseas at the 2016 census. The five largest groups of overseas-born were from England (5.8%), India (1.6%), China (1.5%), Italy (1.1%) and Vietnam (0.9%). 2% of the population, or 34,184 people, identified as Indigenous Australians ( Aboriginal Australians and Torres Strait Islanders ) in 2016. At
3080-572: The 2020–21 financial year. This was the first time since the Australian Bureau of Statistics began collecting data in 1990 that South Australia had outperformed the other states. The recovery was driven in part by growth in the agricultural sector, which increased its production by almost 24% thanks to the end of a drought. Wheat , barley , oats , rye , peas , beans , chickpeas , lentils and canola are grown in South Australia. Apples , pears , cherries and strawberries are grown in
3168-516: The Australian population and ranks fifth in population among the six states and two territories. The majority of its people reside in greater Metropolitan Adelaide. Most of the remainder are settled in fertile areas along the south-eastern coast and River Murray . The state's colonial origins are unique in Australia as a freely settled, planned British province , rather than as a convict settlement. Colonial government commenced on 28 December 1836, when
3256-530: The Commissioners' permission to send Company ships to South Australia, in advance of the surveys and ahead of the Commissioners' colonists. The company's settlement of seven vessels and 636 people was temporarily made at Kingscote on Kangaroo Island, until the official site of the capital was selected by William Light, where the City of Adelaide is currently located. The first immigrants arrived at Holdfast Bay (near
3344-963: The German Lutheran church to this day. South Australia was the location of the first Muslim mosque in Australia. Stromatolites Stromatolites ( / s t r oʊ ˈ m æ t ə ˌ l aɪ t s , s t r ə -/ stroh- MAT -ə-lytes, strə- ) or stromatoliths (from Ancient Greek στρῶμα ( strôma ) , GEN στρώματος ( strṓmatos ) 'layer, stratum' and λίθος ( líthos ) 'rock') are layered sedimentary formations ( microbialite ) that are created mainly by photosynthetic microorganisms such as cyanobacteria , sulfate-reducing bacteria , and Pseudomonadota (formerly proteobacteria). These microorganisms produce adhesive compounds that cement sand and other rocky materials to form mineral " microbial mats ". In turn, these mats build up layer by layer, growing gradually over time. This process generates
3432-574: The Imperial Parliament enacted the Australian Colonies Government Act , which allowed for the election of representatives to each of the colonial legislatures and the drafting of a constitution to properly create representative and responsible government in South Australia. Later that year, propertied male colonists were allowed to vote for 16 members on a new 24 seat Legislative Council. Eight members continued to be appointed by
3520-463: The Nettle Cave at Jenolan Caves , NSW , Australia. The cyanobacteria live on the surface of the limestone and are sustained by the calcium-rich dripping water, which allows them to grow toward the two open ends of the cave which provide light. Stromatolites composed of calcite have been found in both the Blue Lake in the dormant volcano, Mount Gambier and at least eight cenote lakes including
3608-575: The Precambrian but persist throughout the Palaeozoic and Mesozoic . Since the Eocene , porostromate stromatolites are known only from freshwater settings. Time lapse photography of modern microbial mat formation in a laboratory setting gives some revealing clues to the behavior of cyanobacteria in stromatolites. Biddanda et al. (2015) found that cyanobacteria exposed to localized beams of light moved towards
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3696-420: The amount of oxygen in the primeval Earth's atmosphere through their continuing photosynthesis (see Great Oxygenation Event ). They use water, carbon dioxide, and sunlight to create their food. A layer of polysaccharides often forms over mats of cyanobacterial cells. In modern microbial mats, debris from the surrounding habitat can become trapped within the polysaccharide layer, which can be cemented together by
3784-501: The border on the ground in the 1920s. In 1863, that part of New South Wales to the north of South Australia was annexed to South Australia, by letters patent, as the "Northern Territory of South Australia", which became shortened to the Northern Territory on 6 July 1863 . The Northern Territory was handed to the federal government in 1911 and became a separate territory. According to Australian maps, South Australia's south coast
3872-486: The boundaries of the Province of South Australia, provided that "nothing in those our Letters Patent shall affect or be construed to affect the rights of any Aboriginal Natives of the said Province to the actual occupation and enjoyment in their own Persons or in the Persons of their Descendants of any Lands therein now actually occupied or enjoyed by such Natives." Although the patent guaranteed land rights under force of law for
3960-444: The calcium carbonate to grow thin laminations of limestone . These laminations can accrete over time, resulting in the banded pattern common to stromatolites. The domal morphology of biological stromatolites is the result of the vertical growth necessary for the continued infiltration of sunlight to the organisms for photosynthesis. Layered spherical growth structures termed oncolites are similar to stromatolites and are also known from
4048-417: The characteristic lamination of stromatolites, a feature that is hard to interpret, in terms of its temporal and environmental significance. Different styles of stromatolite lamination have been described, which can be studied through microscopic and mathematical methods. A stromatolite may grow to a meter or more. Fossilized stromatolites provide important records of some of the most ancient life. As of
4136-604: The cliffs of the Great Australian Bight . Features of the coast include Spencer Gulf and the Eyre and Yorke Peninsulas that surround it. The Temperate Grassland of South Australia is situated to the east of Gulf St Vincent . The principal industries and exports of South Australia are wheat, wine and wool. More than half of Australia's wines are produced in the South Australian wine regions which principally include Barossa Valley , Clare Valley , McLaren Vale , Coonawarra ,
4224-581: The community and enforce government regulations. Their principal role was to run the first temporary gaol, a two-room hut. The current flag of South Australia was adopted on 13 January 1904, and is a British blue ensign defaced with the state badge. The badge is described as a piping shrike with wings outstretched on a yellow disc. The state badge is believed to have been designed by Robert Craig of Adelaide's School of Design . The terrain consists largely of arid and semi-arid rangelands, with several low mountain ranges . The most important (but not tallest)
4312-545: The continent, early settlements were all on the eastern coast and only a few intrepid explorers ventured this far west. It took more than forty years before any serious proposal to establish settlements in the south-western portion of New South Wales were put forward. On 15 August 1834, the British Parliament passed the South Australia Act 1834 ( Foundation Act ), which empowered His Majesty to erect and establish
4400-405: The cyanobacteria form clumps that then expand outwards, with individual members remaining connected to the colony via long tendrils. This may be a protective mechanism that affords evolutionary benefit to the colony in harsh environments where mechanical forces act to tear apart the microbial mats. Thus these sometimes elaborate structures, constructed by microorganisms working somewhat in unison, are
4488-479: The first in the world to allow women to stand for election. In 1897 Catherine Helen Spence was the first woman in Australia to be a candidate for political office when she was nominated to be one of South Australia's delegates to the conventions that drafted the constitution. South Australia became an original state of the Commonwealth of Australia on 1 January 1901. Although the lower house had universal suffrage,
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#17330852826194576-573: The fossil record of the Precambrian but are rare today. Very few Archean stromatolites contain fossilized microbes, but fossilized microbes are sometimes abundant in Proterozoic stromatolites. While features of some stromatolites are suggestive of biological activity, others possess features that are more consistent with abiotic (non-biological) precipitation. Finding reliable ways to distinguish between biologically formed and abiotic stromatolites
4664-473: The fossil record. Thrombolites are poorly laminated or non-laminated clotted structures formed by cyanobacteria, common in the fossil record and in modern sediments. There is evidence that thrombolites form in preference to stromatolites when foraminifera are part of the biological community. The Zebra River Canyon area of the Kubis platform in the deeply dissected Zaris Mountains of southwestern Namibia provides
4752-675: The genus Scytonema ) occurs in Chetumal Bay in Belize , just south of the mouth of the Rio Hondo and the Mexican border. Large microbialite towers up to 40 m high were discovered in the largest soda lake on Earth Lake Van in eastern Turkey. They are composed of aragonite and grow by precipitation of calcite from sub-lacustrine karst-water. Freshwater stromatolites are found in Lake Salda in southern Turkey. The waters are rich in magnesium and
4840-497: The government is the party or coalition that exerts a majority in the House of Assembly. The Legislative Council remained a predominantly conservative chamber elected by property owners. Women's suffrage in Australia took a leap forward – enacted in 1895 and taking effect from the 1896 colonial election , South Australia was the first government in Australia and only the second in the world after New Zealand to allow women to vote, and
4928-526: The governor. The main responsibility of this body was to draft a constitution for South Australia. The body drafted the most democratic constitution ever seen in the British Empire and provided for universal manhood suffrage . It created the bicameral Parliament of South Australia . For the first time in the colony, the executive was elected by the people, and the colony used the Westminster system , where
5016-694: The indigenous inhabitants, it was ignored by the South Australian Company authorities and squatters. Despite strong reference to the rights of the native population in the initial proclamation by the Governor, there were many conflicts and deaths in the Australian Frontier Wars in South Australia. Survey was required before settlement of the province, and the Colonization Commissioners for South Australia appointed William Light as
5104-488: The lake over the years including a 1966 Morris 1100 , an old petrol bowser , traffic signs and ’witches hats’ . The Little Blue Lake is one of a number of similar landforms occurring in the area to the south of the dormant volcano in Mount Gambier including the area around the dormant volcano at Mount Schank. These cenotes are similar in form as they all have collapse dolines with circular plans, cliffs, lakes filled to
5192-520: The lake's east side. Diving in the sinkhole is only permitted for cave divers who hold at least the CDAA Deep Cavern grade rating. Cave dive sites: South Australia South Australia (commonly abbreviated as SA ) is a state in the southern central part of Australia . With a total land area of 984,321 square kilometres (380,048 sq mi), it is the fourth-largest of Australia's states and territories by area, which includes some of
5280-403: The lead over other Australian states for its commercialisation and commitment to renewable energy . It is now the leading producer of wind power in Australia. Renewable energy is a growing source of electricity in South Australia, and there is potential for growth from this particular industry of the state's economy. The Hornsdale Power Reserve is a bank of grid-connected batteries adjacent to
5368-409: The leader of its 'First Expedition', tasked with examining 1500 miles of the South Australian coastline and selecting the best site for the capital, and with then planning and surveying the site of the city into one-acre Town Sections and its surrounds into 134-acre Country Sections. Eager to commence the establishment of their whale and seal fisheries, the South Australian Company sought, and obtained,
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#17330852826195456-456: The least amount of federal funding for its local road network of all states on a per capita and a per kilometre basis. During 2019-20: South Australia's gross state product (GSP) fell 1.4% in chain volume (real) terms (nationally, gross domestic product (GDP) fell 0.3%). South Australia came out of the COVID-19 recession better than the other Australian states, with the economy growing by 3.9% in
5544-656: The letters patent of the imperial government to create the colony. He was accountable only to the British Colonial Office , and thus democracy did not exist in the colony. A new body was created to advise the governor on the administration of South Australia in 1843 called the Legislative Council. It consisted of three representatives of the British Government and four colonists appointed by the governor. The governor retained total executive power. In 1851,
5632-445: The light, or expressed phototaxis , and increased their photosynthetic yield, which is necessary for survival. In a novel experiment, the scientists projected a school logo onto a petri dish containing the organisms, which accreted beneath the lighted region, forming the logo in bacteria. The authors speculate that such motility allows the cyanobacteria to seek light sources to support the colony. In both light and dark conditions,
5720-482: The members of the council were sworn in near the Old Gum Tree . As with the rest of the continent, the region has a long history of human occupation by numerous tribes and languages. The South Australian Company established a temporary settlement at Kingscote , Kangaroo Island , on 26 July 1836, five months before Adelaide was founded. The guiding principle behind settlement was that of systematic colonisation ,
5808-507: The mine closed in 1978. The combination of a low sedimentation rate, high calcification rate, and low microbial growth rate appears to result in the formation of these microbialites. Microbialites at an historic mine site demonstrates that an anthropogenically constructed environment can foster microbial carbonate formation. This has implications for creating artificial environments for building modern microbialites including stromatolites. A very rare type of non-lake dwelling stromatolite lives in
5896-404: The most arid parts of the continent, and with 1.8 million people it is the fifth-largest of the states and territories by population. This population is the second-most highly centralised in the nation after Western Australia , with more than 77% of South Australians living in the capital Adelaide or its environs. Other population centres in the state are relatively small; Mount Gambier ,
5984-475: The nutrient levels. The lake is also known as Baby Blue and is referenced in caving literature by its Cave Exploration Group of South Australia (CEGSA) Inc. identification number 5L9 . The lake is located approximately 20 kilometres (12 mi) south of the City of Mount Gambier, on the north side of Mount Salt Road (near Mount Schank) about 3.5 kilometres (2.2 mi) west of the Riddoch Highway , which
6072-410: The only factor in the reduction in stromatolite abundance. Factors such as the chemistry of the environment may have been responsible for changes. While prokaryotic cyanobacteria reproduce asexually through cell division, they were instrumental in priming the environment for the evolutionary development of more complex eukaryotic organisms. They are thought to be largely responsible for increasing
6160-423: The present day Glenelg ) in November 1836. The commencement of colonial government was proclaimed on 28 December 1836, now known as Proclamation Day . South Australia is the only Australian state to have never received British convicts. Another free settlement, Swan River colony was established in 1829 but Western Australia later sought convict labour, and in 1849 Western Australia was formally constituted as
6248-447: The repair of UV induced damages in DNA by the processes of nucleotide excision repair and photoreactivation . Other locations include Pampa del Tamarugal National Reserve in Chile; Lagoa Salgada , Rio Grande do Norte , Brazil, where modern stromatolites can be observed as both bioherms (domal type) and beds; and in the Puna de Atacama of the Andes. Inland stromatolites can be found in saline waters in Cuatro Ciénegas Basin ,
6336-476: The result of natural material deposition or some other abiogenic mechanism. Scientists have argued for a biological origin of stromatolites due to the presence of organic globule clusters within the thin layers of the stromatolites, of aragonite nanocrystals (both features of current stromatolites), and of other microstructures in older stromatolites that parallel those in younger stromatolites that show strong indications of biological origin. Stromatolites are
6424-466: The second-largest centre, has a population of 26,878. South Australia shares borders with all the other mainland states. It is bordered to the west by Western Australia , to the north by the Northern Territory , to the north-east by Queensland , to the east by New South Wales , to the south-east by Victoria , and to the south by the Great Australian Bight . The state comprises less than 8% of
6512-401: The sinkhole’s bottom to a maximum recorded depth of just over 42 metres (depending on regional water-table fluctuations). The underwater visibility is normally poor, but can at times improve at depth and seasonal/longer-term changes in the regional water table can result in high/low variations of around 4 metres (13 ft). A notable feature of the lake is the accumulation of rubbish dumped in
6600-399: The southern side of the sinkhole and a metal stairway that leads to a small floating pontoon. The silty bottom of the lake is very flat with an average depth of about 36 metres (118 ft); its shallowest point is around 25 metres (82 ft) at the top of a rubble pile directly beneath the cut access ramp/pontoon, and a dark, silt-prone region extends around the southern/western sides of
6688-538: The state has a Mediterranean climate , while the rest of the state has either an arid or semi-arid climate . South Australia's main temperature range is 29 °C (84 °F) in January and 15 °C (59 °F) in July. The highest maximum temperature ever recorded was 50.7 °C (123.3 °F) at Oodnadatta on 2 January 1960, which is the highest official temperature recorded in Australia. The lowest minimum temperature
6776-578: The state's upper house with the balance of power controlled by a variety of minor parties and independents. Local government in South Australia is established by the Constitution Act 1934 (SA), the Local Government Act 1999 (SA), and the Local Government (Elections) Act 1999 (SA). South Australia contains 68 councils and 6 Aboriginal and outback communities . Local councils, elected on
6864-770: The stromatolite structures are made of hydromagnesite . Two instances of freshwater stromatolites are found in Canada, at Pavilion Lake and Kelly Lake in British Columbia . Pavilion Lake has the largest known freshwater stromatolites, and NASA has conducted xenobiology research there, called the " Pavilion Lake Research Project ." The goal of the project is to better understand what conditions would likely harbor life on other planets. Microbialites have been discovered in an open pit pond at an abandoned asbestos mine near Clinton Creek , Yukon , Canada. These microbialites are extremely young and presumably began forming soon after
6952-520: The upper house, the Legislative Council, remained the exclusive domain of property owners until the Labor government of Don Dunstan managed to achieve reform of the chamber in 1973. Property qualifications were removed and the Council became a body elected via proportional representation by a single state-wide electorate. Since the following 1975 South Australian state election , no one party has had control of
7040-517: The volcanic eruptions occurring during the Pleistocene and the Holocene rather than by the usual acidification process involving the absorption of atmospheric CO 2 by water prior to entering the water table. The cenotes then filled with freshwater as the sea level started to rise at about 8,000 years ago. The presence of stromatolites in at least eight cenotes including the Little Blue Lake
7128-409: The water table, large rubble cones on their floors and clustered together in several groups along in the flat coastal plain composed of a Miocene limestone known as Gambier Limestone. These cenotes differ from other karst landforms in the south east of South Australia by their relative depth (i.e. as deep as 125 metres (410 ft) in one cenote), the absence of any underwater phreatic passages and
7216-447: The world. Opal was first discovered near the town in 1915, and the town became the site of an opal rush, enticing immigrants from southern and eastern Europe in the aftermath of World War II . Higher education and research in Adelaide forms an important part of South Australia's economy. The South Australian Government and educational institutions have attempted to position Adelaide as Australia's education hub and have marketed it as
7304-536: Was cut off by rising sea levels . According to mitochondrial DNA research, Aboriginal people reached Eyre Peninsula 49,000-45,000 years ago from both the east (clockwise, along the coast, from northern Australia) and the west (anti-clockwise). The first recorded European sighting of the South Australian coast was in 1627 when the Dutch ship the Gulden Zeepaert , captained by François Thijssen , examined and mapped
7392-575: Was first discovered in 1831 by Captain Collet Barker and later accurately charted in 1836–37 by Colonel William Light , leader of the South Australian Colonization Commissioners' 'First Expedition' and first Surveyor-General of South Australia. The land which now forms the state of South Australia was claimed for Britain in 1788 as part of the colony of New South Wales . Although the new colony included almost two-thirds of
7480-461: Was the first Australian colony not to have an official state religion, and the colony became attractive to people who had experienced religious discrimination, including Methodists and Unitarians . South Australia also had thousands of Prussian Old Lutheran immigrants, some of whom established their own form of Lutheranism. As a result, the Lutheran Church of Australia remains separate from
7568-470: Was to be religious freedom and no established religion. Sales of land to colonists created an Emigration Fund to pay the costs of transferring a poor young labouring population to South Australia. In early 1838 the colonists became concerned after it was reported that convicts who had escaped from the eastern states may make their way to South Australia. The South Australia Police was formed in April 1838 to protect
7656-610: Was upgraded to AAA by Standard & Poor's in September 2004 and to AAA by Moody's in November 2004, the highest credit ratings achievable by any company or sovereign. The state had previously lost these ratings in the State Bank collapse. However, in 2012 Standard & Poor's downgraded the state's credit rating to AA+ due to declining revenues, new spending initiatives and a weaker than expected budgetary outlook. South Australia receives
7744-769: Was −8.2 °C (17.2 °F) at Yongala on 20 July 1976. The region's overall dry weather is owed to the Australian High on the Great Australian Bight. As of 2016, South Australia had 746,105 people employed out of a total workforce of 806,593, giving an unemployment rate of 7.5%. South Australia's largest employment sector is health care and social assistance, making up 14.8% of the state's total employment, followed by retail (10.7%), education and training (8.6%), manufacturing (8%), and construction (7.6%). South Australia's economy relies on exports more than any other state in Australia. South Australia's credit rating
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