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100-899: The A632 is a major road in Derbyshire and Nottinghamshire , England . It starts in Matlock ( 53°08′05″N 1°32′55″W  /  53.1347°N 1.5485°W  / 53.1347; -1.5485  ( A632 road (western end) ) ) and joins the town with Chesterfield . From there, it goes through Bolsover and then onto the A616 at the village of Cuckney ( 53°14′01″N 1°09′15″W  /  53.2336°N 1.1543°W  / 53.2336; -1.1543  ( A632 road (eastern end) ) ). Download coordinates as: 53°14′00″N 1°24′42″W  /  53.2334°N 1.4116°W  / 53.2334; -1.4116  ( A632 road ) This England road or road transport-related article

200-644: A Middle Paleolithic Acheulean hand axe found near Hopton . Further occupation came with the Upper Paleolithic and Neolithic periods of the Stone Age when Mesolithic hunter-gatherers roamed the hilly tundra. Evidence of these nomadic tribes has been found in limestone caves located on the Nottinghamshire border. Deposits left in the caves date the occupancy at around 12,000 to 7,000 BCE . Burial mounds of Neolithic settlers are also situated throughout

300-455: A Mohs hardness of 2 to 4, dense limestone can have a crushing strength of up to 180 MPa . For comparison, concrete typically has a crushing strength of about 40 MPa. Although limestones show little variability in mineral composition, they show great diversity in texture. However, most limestone consists of sand-sized grains in a carbonate mud matrix. Because limestones are often of biological origin and are usually composed of sediment that

400-457: A bloom of cyanobacteria or microalgae . However, stable isotope ratios in modern carbonate mud appear to be inconsistent with either of these mechanisms, and abrasion of carbonate grains in high-energy environments has been put forward as a third possibility. Formation of limestone has likely been dominated by biological processes throughout the Phanerozoic , the last 540 million years of

500-579: A non-metropolitan county , with eight districts, and the Derby unitary authority area. The East Midlands Combined County Authority includes Derbyshire County Council and Derby City Council. The north and centre of Derbyshire are hilly and contain the southern end of the Pennines , most of which are part of the Peak District National Park . They include Kinder Scout , at 636 m (2,087 ft)

600-473: A unitary authority area of the City of Derby. Derby remains part of Derbyshire only for ceremonial purposes. Derbyshire has become fractionally smaller during government reorganisation over the years. The Sheffield suburbs Woodseats, Beauchief, Handsworth, Woodhouse, Norton, Mosborough , Totley , Bradway and Dore were previously parts of the county, but were lost to Sheffield between 1900 and 1933; Mosborough

700-628: A bryophyte flora for Derbyshire still continues: by 2012 a total of 518 bryophyte species had been recorded for the county. Botanical recording in the UK predominantly uses the unchanging vice-county boundary system, which results in a slightly different map of Derbyshire from the modern geographic county. A number of specialist organisations protect, promote and monitor records of individual animal groups across Derbyshire. The main ones are Derbyshire Ornithological Society; Derbyshire Mammal Group; Derbyshire Bat Group, Derbyshire Amphibian and Reptile Group, and

800-434: A carbonate rock outcrop can be estimated in the field by etching the surface with dilute hydrochloric acid. This etches away the calcite and aragonite, leaving behind any silica or dolomite grains. The latter can be identified by their rhombohedral shape. Crystals of calcite, quartz , dolomite or barite may line small cavities ( vugs ) in the rock. Vugs are a form of secondary porosity, formed in existing limestone by

900-612: A central quartz grain or carbonate mineral fragment. These likely form by direct precipitation of calcium carbonate onto the ooid. Pisoliths are similar to ooids, but they are larger than 2 mm in diameter and tend to be more irregular in shape. Limestone composed mostly of ooids is called an oolite or sometimes an oolitic limestone . Ooids form in high-energy environments, such as the Bahama platform, and oolites typically show crossbedding and other features associated with deposition in strong currents. Oncoliths resemble ooids but show

1000-449: A change in environment that increases the solubility of calcite. Dense, massive limestone is sometimes described as "marble". For example, the famous Portoro "marble" of Italy is actually a dense black limestone. True marble is produced by recrystallization of limestone during regional metamorphism that accompanies the mountain building process ( orogeny ). It is distinguished from dense limestone by its coarse crystalline texture and

1100-949: A composition reflecting the organisms that produced them and the environment in which they were produced. Low-magnesium calcite skeletal grains are typical of articulate brachiopods , planktonic (free-floating) foraminifera, and coccoliths . High-magnesium calcite skeletal grains are typical of benthic (bottom-dwelling) foraminifera, echinoderms , and coralline algae . Aragonite skeletal grains are typical of molluscs , calcareous green algae , stromatoporoids , corals , and tube worms . The skeletal grains also reflect specific geological periods and environments. For example, coral grains are more common in high-energy environments (characterized by strong currents and turbulence) while bryozoan grains are more common in low-energy environments (characterized by quiet water). Ooids (sometimes called ooliths) are sand-sized grains (less than 2mm in diameter) consisting of one or more layers of calcite or aragonite around

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1200-654: A consequence of the underlying geology, but also by the way the land has been managed and shaped by human activity. The county contains 11 discrete landscape types, known as National Character Areas , which have been described in detail by Natural England and further refined, mapped and described by Derbyshire County Council and the Peak District National Park. The 11 National Character Areas found within Derbyshire are: Derbyshire's solid geology can be split into two very different halves. The oldest rocks occur in

1300-412: A considerable fraction of the limestone bed. At depths greater than 1 km (0.62 miles), burial cementation completes the lithification process. Burial cementation does not produce stylolites. When overlying beds are eroded, bringing limestone closer to the surface, the final stage of diagenesis takes place. This produces secondary porosity as some of the cement is dissolved by rainwater infiltrating

1400-483: A drop of dilute hydrochloric acid is dropped on it. Dolomite is also soft but reacts only feebly with dilute hydrochloric acid, and it usually weathers to a characteristic dull yellow-brown color due to the presence of ferrous iron. This is released and oxidized as the dolomite weathers. Impurities (such as clay , sand, organic remains, iron oxide , and other materials) will cause limestones to exhibit different colors, especially with weathered surfaces. The makeup of

1500-621: A few million years, as this is the most stable form of calcium carbonate. Ancient carbonate formations of the Precambrian and Paleozoic contain abundant dolomite, but limestone dominates the carbonate beds of the Mesozoic and Cenozoic . Modern dolomite is quite rare. There is evidence that, while the modern ocean favors precipitation of aragonite, the oceans of the Paleozoic and middle to late Cenozoic favored precipitation of calcite. This may indicate

1600-455: A few thousand years. As rainwater mixes with groundwater, aragonite and high-magnesium calcite are converted to low-calcium calcite. Cementing of thick carbonate deposits by rainwater may commence even before the retreat of the sea, as rainwater can infiltrate over 100 km (60 miles) into sediments beneath the continental shelf. As carbonate sediments are increasingly deeply buried under younger sediments, chemical and mechanical compaction of

1700-490: A high percentage of the mineral dolomite , CaMg(CO 3 ) 2 . Magnesian limestone is an obsolete and poorly-defined term used variously for dolomite, for limestone containing significant dolomite ( dolomitic limestone ), or for any other limestone containing a significant percentage of magnesium . Most limestone was formed in shallow marine environments, such as continental shelves or platforms , though smaller amounts were formed in many other environments. Much dolomite

1800-435: A limestone sample except in thin section and are less common in ancient limestones, possibly because compaction of carbonate sediments disrupts them. Limeclasts are fragments of existing limestone or partially lithified carbonate sediments. Intraclasts are limeclasts that originate close to where they are deposited in limestone, while extraclasts come from outside the depositional area. Intraclasts include grapestone , which

1900-415: A long period. Lead, for example, has been mined since Roman times. The limestone outcrops in the central area led to the establishment of large quarries to supply the industries of surrounding towns with lime for building and steelmaking , and latterly in the 20th-century cement manufacture. The Industrial Revolution also increased demand for building stone , and in the late 19th and early 20th-century,

2000-466: A lower Mg/Ca ratio in the ocean water of those times. This magnesium depletion may be a consequence of more rapid sea floor spreading , which removes magnesium from ocean water. The modern ocean and the ocean of the Mesozoic have been described as "aragonite seas". Most limestone was formed in shallow marine environments, such as continental shelves or platforms . Such environments form only about 5% of

2100-525: A lower diversity of organisms and a greater fraction of silica and clay minerals characteristic of marls . The Green River Formation is an example of a prominent freshwater sedimentary formation containing numerous limestone beds. Freshwater limestone is typically micritic. Fossils of charophyte (stonewort), a form of freshwater green algae, are characteristic of these environments, where the charophytes produce and trap carbonates. Limestones may also form in evaporite depositional environments . Calcite

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2200-523: A mechanism for dolomitization, with one 2004 review paper describing it bluntly as "a myth". Ordinary seawater is capable of converting calcite to dolomite, if the seawater is regularly flushed through the rock, as by the ebb and flow of tides (tidal pumping). Once dolomitization begins, it proceeds rapidly, so that there is very little carbonate rock containing mixed calcite and dolomite. Carbonate rock tends to be either almost all calcite/aragonite or almost all dolomite. About 20% to 25% of sedimentary rock

2300-530: A number of sensitive species are now being seen to be either expanding or contracting their range as a result. For the purposes of protecting and recording the county's most important habitats, Derbyshire has been split into two regions, each with its own Biodiversity Action Plan (BAP), based around National Character Areas. The Peak District BAP includes all of Derbyshire's uplands of the Dark Peak, South-West Peak and White Peak, including an area of limestone beyond

2400-448: A plausible source of mud. Another possibility is direct precipitation from the water. A phenomenon known as whitings occurs in shallow waters, in which white streaks containing dispersed micrite appear on the surface of the water. It is uncertain whether this is freshly precipitated aragonite or simply material stirred up from the bottom, but there is some evidence that whitings are caused by biological precipitation of aragonite as part of

2500-517: A population of 770,600 lived in the county with 248,752 (32%) living in Derby. Although Derbyshire is officially part of the East Midlands statistical region, parts of the county are often considered to be culturally in Northern England , such as Chesterfield and Glossop. The table below shows all towns with over 10,000 inhabitants. During a series of administrative boundary changes during

2600-449: A radial rather than layered internal structure, indicating that they were formed by algae in a normal marine environment. Peloids are structureless grains of microcrystalline carbonate likely produced by a variety of processes. Many are thought to be fecal pellets produced by marine organisms. Others may be produced by endolithic (boring) algae or other microorganisms or through breakdown of mollusc shells. They are difficult to see in

2700-459: A significant part of Derbyshire's economy, as did coal mining. Lead mining has been important here since Roman Times. The more recent river gravels of the Trent valley remain a significant extractive industry today in south Derbyshire, as does the mining of limestone rock in central and northern parts of the county. Coarse sandstones were once extensively quarried both for local building materials and for

2800-460: Is a stub . You can help Misplaced Pages by expanding it . Derbyshire Derbyshire ( / ˈ d ɑːr b i ʃ ɪər , - ʃ ər / DAR -bee-sheer, -⁠shər ) is a ceremonial county in the East Midlands of England. It borders Greater Manchester , West Yorkshire , and South Yorkshire to the north, Nottinghamshire to the east, Leicestershire to the south-east, Staffordshire to

2900-416: Is a type of carbonate sedimentary rock which is the main source of the material lime . It is composed mostly of the minerals calcite and aragonite , which are different crystal forms of CaCO 3 . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place through both biological and nonbiological processes, though biological processes, such as

3000-560: Is also favored on the seaward margin of shelves and platforms, where there is upwelling deep ocean water rich in nutrients that increase organic productivity. Reefs are common here, but when lacking, ooid shoals are found instead. Finer sediments are deposited close to shore. The lack of deep sea limestones is due in part to rapid subduction of oceanic crust, but is more a result of dissolution of calcium carbonate at depth. The solubility of calcium carbonate increases with pressure and even more with higher concentrations of carbon dioxide, which

3100-482: Is an uncommon mineral in limestone, and siderite or other carbonate minerals are rare. However, the calcite in limestone often contains a few percent of magnesium . Calcite in limestone is divided into low-magnesium and high-magnesium calcite, with the dividing line placed at a composition of 4% magnesium. High-magnesium calcite retains the calcite mineral structure, which is distinct from dolomite. Aragonite does not usually contain significant magnesium. Most limestone

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3200-402: Is carbonate rock, and most of this is limestone. Limestone is found in sedimentary sequences as old as 2.7 billion years. However, the compositions of carbonate rocks show an uneven distribution in time in the geologic record. About 95% of modern carbonates are composed of high-magnesium calcite and aragonite. The aragonite needles in carbonate mud are converted to low-magnesium calcite within

3300-474: Is clusters of peloids cemented together by organic material or mineral cement. Extraclasts are uncommon, are usually accompanied by other clastic sediments, and indicate deposition in a tectonically active area or as part of a turbidity current . The grains of most limestones are embedded in a matrix of carbonate mud. This is typically the largest fraction of an ancient carbonate rock. Mud consisting of individual crystals less than 5 μm (0.20 mils) in length

3400-416: Is commonly white to gray in color. Limestone that is unusually rich in organic matter can be almost black in color, while traces of iron or manganese can give limestone an off-white to yellow to red color. The density of limestone depends on its porosity, which varies from 0.1% for the densest limestone to 40% for chalk. The density correspondingly ranges from 1.5 to 2.7 g/cm . Although relatively soft, with

3500-420: Is controlled largely by the amount of dissolved carbon dioxide ( CO 2 ) in the water. This is summarized in the reaction: Increases in temperature or decreases in pressure tend to reduce the amount of dissolved CO 2 and precipitate CaCO 3 . Reduction in salinity also reduces the solubility of CaCO 3 , by several orders of magnitude for fresh water versus seawater. Near-surface water of

3600-545: Is converted to low-magnesium calcite. Diagenesis is the likely origin of pisoliths , concentrically layered particles ranging from 1 to 10 mm (0.039 to 0.394 inches) in diameter found in some limestones. Pisoliths superficially resemble ooids but have no nucleus of foreign matter, fit together tightly, and show other signs that they formed after the original deposition of the sediments. Silicification occurs early in diagenesis, at low pH and temperature, and contributes to fossil preservation. Silicification takes place through

3700-503: Is deposited close to where it formed, classification of limestone is usually based on its grain type and mud content. Most grains in limestone are skeletal fragments of marine organisms such as coral or foraminifera . These organisms secrete structures made of aragonite or calcite, and leave these structures behind when they die. Other carbonate grains composing limestones are ooids , peloids , and limeclasts ( intraclasts and extraclasts  [ ca ] ). Skeletal grains have

3800-460: Is described as coquinite . Chalk is a soft, earthy, fine-textured limestone composed of the tests of planktonic microorganisms such as foraminifera, while marl is an earthy mixture of carbonates and silicate sediments. Limestone forms when calcite or aragonite precipitate out of water containing dissolved calcium, which can take place through both biological and nonbiological processes. The solubility of calcium carbonate ( CaCO 3 )

3900-617: Is described as micrite . In fresh carbonate mud, micrite is mostly small aragonite needles, which may precipitate directly from seawater, be secreted by algae, or be produced by abrasion of carbonate grains in a high-energy environment. This is converted to calcite within a few million years of deposition. Further recrystallization of micrite produces microspar , with grains from 5 to 15 μm (0.20 to 0.59 mils) in diameter. Limestone often contains larger crystals of calcite, ranging in size from 0.02 to 0.1 mm (0.79 to 3.94 mils), that are described as sparry calcite or sparite . Sparite

4000-462: Is distinguished from micrite by a grain size of over 20 μm (0.79 mils) and because sparite stands out under a hand lens or in thin section as white or transparent crystals. Sparite is distinguished from carbonate grains by its lack of internal structure and its characteristic crystal shapes. Geologists are careful to distinguish between sparite deposited as cement and sparite formed by recrystallization of micrite or carbonate grains. Sparite cement

4100-560: Is one of the first minerals to precipitate in marine evaporites. Most limestone is formed by the activities of living organisms near reefs, but the organisms responsible for reef formation have changed over geologic time. For example, stromatolites are mound-shaped structures in ancient limestones, interpreted as colonies of cyanobacteria that accumulated carbonate sediments, but stromatolites are rare in younger limestones. Organisms precipitate limestone both directly as part of their skeletons, and indirectly by removing carbon dioxide from

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4200-473: Is otherwise chemically fairly pure, with clastic sediments (mainly fine-grained quartz and clay minerals ) making up less than 5% to 10% of the composition. Organic matter typically makes up around 0.2% of a limestone and rarely exceeds 1%. Limestone often contains variable amounts of silica in the form of chert or siliceous skeletal fragments (such as sponge spicules, diatoms , or radiolarians ). Fossils are also common in limestone. Limestone

4300-472: Is produced by decaying organic matter settling into the deep ocean that is not removed by photosynthesis in the dark depths. As a result, there is a fairly sharp transition from water saturated with calcium carbonate to water unsaturated with calcium carbonate, the lysocline , which occurs at the calcite compensation depth of 4,000 to 7,000 m (13,000 to 23,000 feet). Below this depth, foraminifera tests and other skeletal particles rapidly dissolve, and

4400-514: Is secondary dolomite, formed by chemical alteration of limestone. Limestone is exposed over large regions of the Earth's surface, and because limestone is slightly soluble in rainwater, these exposures often are eroded to become karst landscapes. Most cave systems are found in limestone bedrock. Limestone has numerous uses: as a chemical feedstock for the production of lime used for cement (an essential component of concrete ), as aggregate for

4500-702: The EFL Championship , the second tier of English football. The next highest-placed team is Chesterfield , which participates in EFL League Two , the fourth tier of English football. There are also many non-league teams playing throughout the county, most notably Alfreton Town , which plays in the National League North . The county is currently home to the world's oldest football club, Sheffield F.C. , which plays in Dronfield in north-east Derbyshire. Glossop

4600-486: The East Midlands Combined Authority , and elected the first Mayor of the East Midlands in the 2024 East Midlands Mayoral Election . The Derbyshire school system is comprehensive with no selective schools. The independent sector includes Repton School , Trent College and The Elms School . There are several towns in the county, with Derby the largest and most populous. At the time of the 2011 census,

4700-668: The Hope Valley and near Glossop . Later they settled round Buxton , famed for its warm springs, and set up a fort near modern-day Derby in an area now known as Little Chester . Several kings of Mercia are buried in the Repton area. Following the Norman Conquest , much of the county was subject to the forest laws . To the northwest was the Forest of High Peak under the custodianship of William Peverel and his descendants. The rest of

4800-656: The 20th century, settlements which were historically part of the county now fall under the administrative areas of Greater Manchester , South Yorkshire , and Staffordshire : Numerous other boundary changes also took place during the course of the 19th century, with county settlements being ceded to the counties of Staffordshire and Leicestershire Because of the size of the county, southern parts of Derbyshire such as Derby, Matlock, Ashbourne and Bakewell are covered by BBC East Midlands and ITV Central in Nottingham , broadcast from Waltham . Northeast Derbyshire, Chesterfield,

4900-484: The Derbyshire & Nottingham Entomological Society. All maintain databases of wildlife sightings, whilst some such as the Derbyshire Ornithological Society provide alerts of rare sightings on their websites or social media pages and also publish major works describing the status and distribution of species. Derbyshire has a mixture of a rural economy in the west, with a former coal-mining economy in

5000-496: The Earth's history. Limestone may have been deposited by microorganisms in the Precambrian , prior to 540 million years ago, but inorganic processes were probably more important and likely took place in an ocean more highly oversaturated in calcium carbonate than the modern ocean. Diagenesis is the process in which sediments are compacted and turned into solid rock . During diagenesis of carbonate sediments, significant chemical and textural changes take place. For example, aragonite

5100-665: The Peak District LNP and the Lowland Derbyshire & Nottinghamshire LNP. Since 2002, the county flower for Derbyshire has been Jacob's-ladder ( Polemonium caeruleum ), a relatively rare species, and characteristic of certain limestone dales in the White Peak. Derbyshire is known to have contained 1,919 separate taxa of vascular plants (including species, hybrids and micro-species) since modern recording began, of which 1,133 are known to be either native or archaeophyte ,

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5200-497: The UK's largest car manufacturing plants at Burnaston . Ashbourne Water used to be bottled in Buxton by Nestlé Waters UK until 2006 and Buxton Water still is. Derbyshire is one of only three counties permitted to make cheese that is labelled as Stilton cheese . The others are Leicestershire and Nottinghamshire . The smallest of six companies making this product is Hartington Creamery at Pikehall . As of March 2021, Hartington Stilton

5300-430: The accumulation of corals and shells in the sea, have likely been more important for the last 540 million years. Limestone often contains fossils which provide scientists with information on ancient environments and on the evolution of life. About 20% to 25% of sedimentary rock is carbonate rock, and most of this is limestone. The remaining carbonate rock is mostly dolomite , a closely related rock, which contains

5400-414: The arrival of the railways led to a large number of stone quarries being established. This industry has left its mark on the countryside, but is still a major industry: a lot of the stone is supplied as crushed stone for road building and concrete manufacture, and is moved by rail. Derbyshire's relative remoteness in the late 18th century and an abundance of fast-flowing streams led to a proliferation of

5500-434: The base of roads, as white pigment or filler in products such as toothpaste or paint, as a soil conditioner , and as a popular decorative addition to rock gardens . Limestone formations contain about 30% of the world's petroleum reservoirs . Limestone is composed mostly of the minerals calcite and aragonite , which are different crystal forms of calcium carbonate ( CaCO 3 ). Dolomite , CaMg(CO 3 ) 2 ,

5600-657: The beds. This may include the formation of vugs , which are crystal-lined cavities within the limestone. Diagenesis may include conversion of limestone to dolomite by magnesium-rich fluids. There is considerable evidence of replacement of limestone by dolomite, including sharp replacement boundaries that cut across bedding. The process of dolomitization remains an area of active research, but possible mechanisms include exposure to concentrated brines in hot environments ( evaporative reflux ) or exposure to diluted seawater in delta or estuary environments ( Dorag dolomitization ). However, Dorag dolomitization has fallen into disfavor as

5700-463: The best-known. Cemented screes and tufa deposits occur very rarely in the limestone dales and rivers, whilst cave systems have been created naturally in the limestone since Pleistocene times. A recently discovered cave chamber near Castleton , named Titan , is the deepest shaft and biggest chamber of any cave in Britain. The oldest rocks are Lower Carboniferous limestones of Dinantian age, which form

5800-491: The core of the White Peak within the Peak District National Park. Because northern Derbyshire is effectively an uplifted dome of rock layers that have subsequently eroded to expose older rocks in the centre of the Derbyshire Dome , these are encircled by progressively younger limestone rocks, until they in turn give way on three sides to Upper Carboniferous shales, gritstones and sandstones of Namurian age. Younger still are

5900-520: The county and surround large conurbations: Because of its central location in England and altitude range from 27 metres in the south to 636 metres in the north, Derbyshire contains many species at the edge of their UK distribution ranges. Some species with a predominantly northern British distribution are at the southern limit of their range, whilst others with a more southern distribution are at their northern limit in Derbyshire. As climate change progresses,

6000-706: The county are the River Derwent and the River Dove which both join the River Trent in the south. The River Derwent rises in the moorland of Bleaklow and flows throughout the Peak District and county for the majority of its course, while the River Dove rises in Axe Edge Moor and forms a boundary between Derbyshire and Staffordshire for most of its length. The varied landscapes within Derbyshire have been formed mainly as

6100-479: The county is provided by BBC Radio Derby , BBC Radio Sheffield (covering Chesterfield and Bolsover ) and BBC Radio Manchester (covering Glossop, New Miils and Chapel-en-le-Frith). County-wide commercial radio stations are Capital Midlands , Hits Radio East Midlands , Gold , Greatest Hits Radio East Midlands and Greatest Hits Radio Yorkshire (for Chesterfield, Matlock and Bakewell). Derbyshire has two Football League teams, Derby County , which plays in

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6200-518: The county was bestowed upon Henry de Ferrers , a part of it becoming Duffield Frith . In time the whole area was given to the Duchy of Lancaster . Meanwhile, the Forest of East Derbyshire covered the whole county to the east of the River Derwent from the reign of Henry II to that of Edward I . The terrain of Derbyshire mostly consists of uplands to the north and centre of the county, and lowlands to

6300-489: The county. In the moors of the Peak District signs of clearance, arable fields and hut circles were found after archaeological investigation. However this area and another settlement at Swarkestone are all that have been found. During the Roman conquest of Britain , the invaders were attracted to Derbyshire for its lead ore in the limestone hills of the area. They settled throughout the county, with forts built near Brough in

6400-539: The county. These chambered tombs were designed for collective burial and are mostly located in the central Derbyshire region. There are tombs at Minninglow and Five Wells that date back to between 2000 and 2500 BCE. Three miles west of Youlgreave lies the Neolithic henge monument of Arbor Low , which has been dated to 2500 BCE. It is not until the Bronze Age that real signs of agriculture and settlement are found in

6500-462: The depositional fabric of carbonate rocks. Dunham divides the rocks into four main groups based on relative proportions of coarser clastic particles, based on criteria such as whether the grains were originally in mutual contact, and therefore self-supporting, or whether the rock is characterized by the presence of frame builders and algal mats. Unlike the Folk scheme, Dunham deals with the original porosity of

6600-469: The deposits are highly porous, so that they have a spongelike texture, they are typically described as tufa . Secondary calcite deposited by supersaturated meteoric waters ( groundwater ) in caves is also sometimes described as travertine. This produces speleothems , such as stalagmites and stalactites . Coquina is a poorly consolidated limestone composed of abraded pieces of coral , shells , or other fossil debris. When better consolidated, it

6700-406: The earth's oceans are oversaturated with CaCO 3 by a factor of more than six. The failure of CaCO 3 to rapidly precipitate out of these waters is likely due to interference by dissolved magnesium ions with nucleation of calcite crystals, the necessary first step in precipitation. Precipitation of aragonite may be suppressed by the presence of naturally occurring organic phosphates in

6800-635: The eastern High Peak (Hope Valley) and northern area of the Derbyshire Dales ( Tideswell and Hathersage ) are covered by ITV Yorkshire and BBC Yorkshire from Emley Moor , with their ITV News Calendar and Look North programmes, both from Leeds . The western area of the High Peak ( Buxton , Glossop , New Miils and Chapel-en-le-Frith ) is covered by BBC North West from Winter Hill and ITV Granada , both based in Salford . BBC Local Radio for

6900-429: The far south of Derbyshire from Ticknall (limestone) to Swadlincote (coal measures). Some areas of the White Peak exhibit contemporaneous basalt flows (e.g. Ravens Tor at Millers Dale), as well as subsequent dolerite sill intrusion at a much later stage (e.g. near Tideswell Dale), whilst mineralisation of the carboniferous limestone in a subsequent period created extensive lead and fluorite deposits which have formed

7000-399: The first refers to the grains and the second to the cement. For example, a limestone consisting mainly of ooids, with a crystalline matrix, would be termed an oosparite. It is helpful to have a petrographic microscope when using the Folk scheme, because it is easier to determine the components present in each sample. Robert J. Dunham published his system for limestone in 1962. It focuses on

7100-572: The formation of distinctive minerals from the silica and clay present in the original limestone. Two major classification schemes, the Folk and Dunham, are used for identifying the types of carbonate rocks collectively known as limestone. Robert L. Folk developed a classification system that places primary emphasis on the detailed composition of grains and interstitial material in carbonate rocks . Based on composition, there are three main components: allochems (grains), matrix (mostly micrite), and cement (sparite). The Folk system uses two-part names;

7200-429: The geologic record are called bioherms . Many are rich in fossils, but most lack any connected organic framework like that seen in modern reefs. The fossil remains are present as separate fragments embedded in ample mud matrix. Much of the sedimentation shows indications of occurring in the intertidal or supratidal zones, suggesting sediments rapidly fill available accommodation space in the shelf or platform. Deposition

7300-1143: The high moors. The dales of the White Peak are known for habitats such as calcareous grassland , ash woodlands and rock outcrops in all of which a much greater richness of lime-loving species occurs than elsewhere in the county. These include various orchids (such as early purple orchid ( Orchis mascula ), dark-red helleborine ( Epipactis atrorubens ) and fly orchid ( Ophrys insectifera )), common rockrose ( Helianthemum nummularium ), spring cinquefoil ( Helianthemum nummularium ) and grass of parnassus ( Parnassia palustris ). Specialised communities of plants occur on former lead workings, where typical metallophyte species include spring sandwort ( Minuartia verna ), alpine penny-cress ( Thlaspi caerulescens ) (both known locally in Derbyshire as Leadwort), as well as mountain pansy ( Viola lutea ) and moonwort ( Botrychium lunaria ). In 2015, Derbyshire contained 304 vascular plant species now designated as of international, national or local conservation concern, for their rarity or recent declines, and collectively listed as Derbyshire Red Data plants. Work on recording and publishing

7400-581: The highest point in the county. The River Derwent is the longest in the county, at 66 miles (106 km), and flows south until it meets the River Trent just south of Derby. Church Flatts Farm at Coton in the Elms , near Swadlincote, is the furthest point from the sea in the UK. The area that is now Derbyshire was first visited, probably briefly, by humans 200,000 years ago during the Aveley interglacial , as shown by

7500-702: The last 120 years in a series of four major botanical works, each by different authors between 1889 and 2015, all entitled The Flora of Derbyshire . Plant recording is mainly undertaken locally by volunteers from the Derbyshire Flora Group, and by staff at Derbyshire Wildlife Trust and the Peak District National Park. The Dark Peak is marked by heathlands, bogs, gritstone edges and acid grasslands containing relatively few species, with plants such as heather ( Calluna vulgaris ), crowberry ( Empetrum nigrum ), bilberry ( Vaccinium myrtillus ) and hare's-tail cotton grass ( Eriophorum vaginatum ) being dominant on

7600-616: The main city of Derby, the largest town in the county is Chesterfield . Derbyshire is also part of multiple combined authorities . The Erewash, Amber Valley and Derby districts are part of the D2N2 partnership with neighbouring Nottinghamshire. The Derbyshire Dales, Bolsover, North East Derbyshire and Chesterfield districts are part of the South Yorkshire Mayoral Combined Authority (as non constituent members). Derbyshire County Council and Derby City Council are part of

7700-431: The map above. These district councils are responsible for local planning and building control, local roads, council housing , environmental health , markets and fairs, refuse collection and recycling, cemeteries and crematoria, leisure services, parks, and tourism. Education, social services, libraries, main roads, public transport, policing and fire services, trading standards , waste disposal and strategic planning are

7800-522: The national park boundary. The remaining areas are monitored and recorded in the Lowland Derbyshire Biodiversity Action Plan, which subdivides the landscape into eight smaller Action Areas. The Derbyshire Biological Records Centre was formerly based at Derby Museum and Art Gallery, but since 2011 has been managed by Derbyshire Wildlife Trust. Two of Englands 48 Local Nature Partnerships (LNP) also cover Derbyshire; these are

7900-469: The north-east (Bolsover district), the Erewash Valley around Ilkeston and in the south around Swadlincote. The rural landscape varies from arable farmland in the flatlands to the south of Derby, to upland pasture and moorland in the high gritstone uplands of the southern Pennines. Derbyshire is rich in natural mineral resources such as lead, iron, coal , and limestone, which have been exploited over

8000-723: The northern, more upland half of the county, and are mostly of Carboniferous age, comprising limestones , gritstones , sandstones and shales . In its north-east corner to the east of Bolsover , there are also Magnesian Limestone rocks of Permian age. In contrast, the southern and more lowland half of Derbyshire contains much softer rocks, mainly mudstones and sandstones of Permo-Triassic age, which create gentler, more rolling landscapes with few rock outcrops. Across both regions can be found drift deposits of Quaternary age – mainly terrace and river gravel deposits and boulder clays. Landslip features are found on unstable layers of sandstones and shales, with Mam Tor and Alport Castles being

8100-410: The ocean basins, but limestone is rarely preserved in continental slope and deep sea environments. The best environments for deposition are warm waters, which have both a high organic productivity and increased saturation of calcium carbonate due to lower concentrations of dissolved carbon dioxide. Modern limestone deposits are almost always in areas with very little silica-rich sedimentation, reflected in

8200-458: The production of gritstone grinding wheels for use in mills, and both former industries have left their mark on the Derbyshire landscape. As well as the protections afforded to the Peak District area under national and local policies, there are several green belts within the county, aimed at preserving the landscape surrounding main urban areas. There are four such areas, the first three being portions of much larger green belts that extend outside

8300-426: The reaction: Fossils are often preserved in exquisite detail as chert. Cementing takes place rapidly in carbonate sediments, typically within less than a million years of deposition. Some cementing occurs while the sediments are still under water, forming hardgrounds . Cementing accelerates after the retreat of the sea from the depositional environment, as rainwater infiltrates the sediment beds, often within just

8400-482: The relative purity of most limestones. Reef organisms are destroyed by muddy, brackish river water, and carbonate grains are ground down by much harder silicate grains. Unlike clastic sedimentary rock, limestone is produced almost entirely from sediments originating at or near the place of deposition. Limestone formations tend to show abrupt changes in thickness. Large moundlike features in a limestone formation are interpreted as ancient reefs , which when they appear in

8500-795: The remainder being non-native species. These comprise 336 established species, 433 casuals and 17 unassigned. It is known that 34 species of plants once native here have been lost from Derbyshire (i.e. become locally extinct) since modern plant recording began in the 17th century. Derbyshire contains two endemic vascular plants, found nowhere else in the world: Rubus durescens , a bramble occurring in central Derbyshire, and Derby hawkweed ( Hieracium naviense ), still known only from Winnats Pass . One endemic species of moss, Derbyshire Feather Moss , occurs in one small 3-metre patch in just one Derbyshire limestone dale, its sole world location intentionally kept confidential. The distribution and status of vascular plants in Derbyshire have been recorded over

8600-563: The responsibility of the County Council. Although Derbyshire is in the East Midlands , some parts, such as High Peak (which incorporated former areas of Cheshire after boundary changes in 1974), are closer to the northern cities of Manchester and Sheffield and these receive services more affiliated with northern England; for example, the North West Ambulance Service , Granada Television and United Utilities .Outside

8700-460: The rock. The Dunham scheme is more useful for hand samples because it is based on texture, not the grains in the sample. A revised classification was proposed by Wright (1992). It adds some diagenetic patterns to the classification scheme. Travertine is a term applied to calcium carbonate deposits formed in freshwater environments, particularly waterfalls , cascades and hot springs . Such deposits are typically massive, dense, and banded. When

8800-419: The sandstones, shales and coal deposits found on the eastern flank of Derbyshire, forming the coal measures, which are of Westphalian age. All these rock layers disappear south of a line drawn between Ashbourne and Derby under layers of clays and sandstones ( Mercia Mudstone Group and Sherwood Sandstones ) of Permo-Triassic age. Small amounts of carboniferous limestones, gritstones and coal measures reappear in

8900-450: The seat of Derbyshire Dales , a Conservative safe seat that had not been won by Labour since the 1945 election . Shown below are the vote and seat count at the 2019 election compared to the 2024 election: Derbyshire has a three-tier local government since the local government reorganisation in 1974. It has a county council based in Matlock and eight district councils and since 1997,

9000-479: The sediments increases. Chemical compaction takes place by pressure solution of the sediments. This process dissolves minerals from points of contact between grains and redeposits it in pore space, reducing the porosity of the limestone from an initial high value of 40% to 80% to less than 10%. Pressure solution produces distinctive stylolites , irregular surfaces within the limestone at which silica-rich sediments accumulate. These may reflect dissolution and loss of

9100-662: The sediments of the ocean floor abruptly transition from carbonate ooze rich in foraminifera and coccolith remains ( Globigerina ooze) to silicic mud lacking carbonates. In rare cases, turbidites or other silica-rich sediments bury and preserve benthic (deep ocean) carbonate deposits. Ancient benthic limestones are microcrystalline and are identified by their tectonic setting. Fossils typically are foraminifera and coccoliths. No pre-Jurassic benthic limestones are known, probably because carbonate-shelled plankton had not yet evolved. Limestones also form in freshwater environments. These limestones are not unlike marine limestone, but have

9200-695: The south and east. The southern foothills and uplands of the Pennines extend from the north of the Trent Valley throughout the Peak District and into the north of the county, reaching the county's highest point at Kinder Scout . The terrain is relatively low-lying across the lower Dove Valley , from the Trent Valley and southwards, the far south of the Derwent Valley and near its eastern borders with Nottinghamshire and Leicestershire . The main rivers in

9300-446: The south and west, and Cheshire to the west. Derby is the largest settlement, and Matlock is the county town. The county has an area of 2,625 km (1,014 sq mi) and a population of 1,053,316. The east of the county is more densely populated than the west, and contains the county's largest settlements: Derby (261,400), Chesterfield (88,483), and Swadlincote (45,000). For local government purposes Derbyshire comprises

9400-664: The use of hydropower at the beginning of the Industrial Revolution , following the mills pioneered by Richard Arkwright . Derbyshire has been said to be the home of the Industrial Revolution, and part of the Derwent Valley has been given World Heritage status in acknowledgement of this historic importance. Nationally famous companies in Derbyshire include Rolls-Royce , one of the world's leading aerospace companies, based since before World War I in Derby, Thorntons just south of Alfreton and Toyota , who have one of

9500-533: The water by photosynthesis and thereby decreasing the solubility of calcium carbonate. Limestone shows the same range of sedimentary structures found in other sedimentary rocks. However, finer structures, such as lamination , are often destroyed by the burrowing activities of organisms ( bioturbation ). Fine lamination is characteristic of limestone formed in playa lakes , which lack the burrowing organisms. Limestones also show distinctive features such as geopetal structures , which form when curved shells settle to

9600-553: The water. Although ooids likely form through purely inorganic processes, the bulk of CaCO 3 precipitation in the oceans is the result of biological activity. Much of this takes place on carbonate platforms . The origin of carbonate mud, and the processes by which it is converted to micrite, continue to be a subject of research. Modern carbonate mud is composed mostly of aragonite needles around 5 μm (0.20 mils) in length. Needles of this shape and composition are produced by calcareous algae such as Penicillus , making this

9700-416: Was likely deposited in pore space between grains, suggesting a high-energy depositional environment that removed carbonate mud. Recrystallized sparite is not diagnostic of depositional environment. Limestone outcrops are recognized in the field by their softness (calcite and aragonite both have a Mohs hardness of less than 4, well below common silicate minerals) and because limestone bubbles vigorously when

9800-606: Was marketing within the UK but also exporting to the US, EU and Canada. The company director told the BBC that they had "a surge in interest and consumer sales from the US". The county is divided into eleven constituencies for the election of members of parliament (MPs) to the House of Commons . In the 2024 United Kingdom general election , all seats in Derbyshire were won by the Labour Party, including

9900-872: Was the smallest town in the country to have a football team in the top tier of English football, Glossop North End . Derbyshire has a cricket team based at the County Cricket Ground. Derbyshire County Cricket Club currently plays in Division Two of the County Championship . There are also rugby league clubs based in the north of the county, the North Derbyshire Chargers and in Derby (Derby City RLFC). The county has numerous rugby union clubs, including Derby, Chesterfield Panthers, Matlock, Ilkeston, Ashbourne, Bakewell and Amber Valley. Limestone Limestone ( calcium carbonate CaCO 3 )

10000-482: Was transferred in 1967. However, Derbyshire gained part of the Longdendale valley and Tintwistle from Cheshire in 1974. The current area of the geographic/ceremonial county of Derbyshire is only 4.7 square kilometres less than it was over 100 years ago. At the third tier are the parish councils , which do not cover all areas. The eight district councils in Derbyshire and the unitary authority of Derby are shown in

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