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105-455: Hameldon Hill is a Carboniferous sandstone hill with a summit elevation of 409 metres (1,342 ft), situated between the towns of Burnley and Accrington in Lancashire , England. It is listed as a "HuMP" or "Hundred Metre Prominence", its parent being Freeholds Top, a Marilyn near Bacup . Other nearby settlements include Hapton and hamlets of Clowbridge and Dunnockshaw in

210-431: A 100 kyr Milankovitch cycle , and so each cyclothem represents a cycle of sea level fall and rise over a 100 kyr period. Coal forms when organic matter builds up in waterlogged, anoxic swamps, known as peat mires, and is then buried, compressing the peat into coal. The majority of Earth's coal deposits were formed during the late Carboniferous and early Permian. The plants from which they formed contributed to changes in

315-486: A defined GSSP. The fusulinid Aljutovella aljutovica can be used to define the base of the Moscovian across the northern and eastern margins of Pangea, however, it is restricted in geographic area, which means it cannot be used for global correlations. The first appearance of the conodonts Declinognathodus donetzianus or Idiognathoides postsulcatus have been proposed as a boundary marking species and potential sites in

420-478: A primitive method of mining, can still be found at Moleside Moor on the western side of the hill. Cupola Colliery mined coal from a number of shafts on the top of the hill, and was already established by the mid-1840s. The colliery was abandoned at the end of 1887 and the site subsequently cleared. The embankment created for its surface tramway can still be traced. It was superseded by several others on its slopes, including Hapton Valley Colliery , which survived to be

525-431: A shallow, tropical seaway which stretched from Southern California to Alaska. The boundary is within a cyclothem sequence of transgressive limestones and fine sandstones , and regressive mudstones and brecciated limestones. The Moscovian Stage is named after shallow marine limestones and colourful clays found around Moscow, Russia. It was first introduced by Sergei Nikitin in 1890. The Moscovian currently lacks

630-509: A single impoundment. Construction of the L-shaped embankment dam of the northern (No 1) reservoir commenced in 1851, but significant issues were encountered in achieving a satisfactory level of water retention. After 1872, the southern (No 2) reservoir was created by extending the western section of the original dam to span the valley, a total distance of 520 metres (1,710 ft). Between 1881 and 1892 major repairs were undertaken, especially to

735-451: A single sedimentary cycle, with an erosional surface at its base. Whilst individual cyclothems are often only metres to a few tens of metres thick, cyclothem sequences can be many hundreds to thousands of metres thick and contain tens to hundreds of individual cyclothems. Cyclothems were deposited along continental shelves where the very gentle gradient of the shelves meant even small changes in sea level led to large advances or retreats of

840-648: A tropical wetland environment. Extensive coal deposits developed within the cyclothem sequences that dominated the Pennsylvanian sedimentary basins associated with the growing orogenic belt. Subduction of the Panthalassic oceanic plate along its western margin resulted in the Antler orogeny in the Late Devonian to Early Mississippian. Further north along the margin, slab roll-back , beginning in

945-423: A variety of methods for reconstructing past atmospheric oxygen levels, including the charcoal record, halite gas inclusions, burial rates of organic carbon and pyrite , carbon isotopes of organic material, isotope mass balance and forward modelling. Depending on the preservation of source material, some techniques represent moments in time (e.g. halite gas inclusions), whilst others have a wider time range (e.g.

1050-750: A warmer climate. This rapid rise in CO 2 may have been due to a peak in pyroclastic volcanism and/or a reduction in burial of terrestrial organic matter. The LPIA peaked across the Carboniferous-Permian boundary. Widespread glacial deposits are found across South America, western and central Africa, Antarctica, Australia, Tasmania, the Arabian Peninsula, India, and the Cimmerian blocks, indicating trans-continental ice sheets across southern Gondwana that reached to sea-level. In response to

1155-516: Is located in Bed 83 of the sequence of dark grey limestones and shales at the Pengchong section, Guangxi , southern China. It is defined by the first appearance of the fusulinid Eoparastaffella simplex in the evolutionary lineage Eoparastaffella ovalis – Eoparastaffella simplex and was ratified in 2009. The Serpukhovian Stage was proposed in 1890 by Russian stratigrapher Sergei Nikitin . It

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1260-528: Is named after the Russian village of Gzhel , near Ramenskoye , not far from Moscow. The name and type locality were defined by Sergei Nikitin in 1890. The Gzhelian currently lacks a defined GSSP. The first appearance of the fusulinid Rauserites rossicus and Rauserites stuckenbergi can be used in the Boreal Sea and Paleo-Tethyan regions but not eastern Pangea or Panthalassa margins. Potential sites in

1365-438: Is named after the city of Serpukhov , near Moscow. currently lacks a defined GSSP. The Visean-Serpukhovian boundary coincides with a major period of glaciation. The resulting sea level fall and climatic changes led to the loss of connections between marine basins and endemism of marine fauna across the Russian margin. This means changes in biota are environmental rather than evolutionary making wider correlation difficult. Work

1470-631: Is that a delay between the development of trees with the wood fibre lignin and the subsequent evolution of lignin-degrading fungi gave a period of time where vast amounts of lignin-based organic material could accumulate. Genetic analysis of basidiomycete fungi, which have enzymes capable of breaking down lignin, supports this theory by suggesting this fungi evolved in the Permian. However, significant Mesozoic and Cenozoic coal deposits formed after lignin-digesting fungi had become well established, and fungal degradation of lignin may have already evolved by

1575-521: Is uncertain, but possibly relates to their appearance. A number of flint tools thought to date to the Mesolithic period have been found at the Great Hameldon summit. Located close to the edge of the plateau to the north, is a small mound called Little Hameldon. It is c. 5 metres (16 ft) high and 60 metres (200 ft) long by 30 metres (98 ft) wide, and has been proposed as

1680-663: Is underway in the Urals and Nashui, Guizhou Province, southwestern China for a suitable site for the GSSP with the proposed definition for the base of the Serpukhovian as the first appearance of conodont Lochriea ziegleri . The Pennsylvanian was proposed by J.J.Stevenson in 1888, named after the widespread coal-rich strata found across the state of Pennsylvania. The closure of the Rheic Ocean and formation of Pangea during

1785-585: The A56 runs through a large cutting on the north-western side of Hameldon, effectively separating Accrington's Peel Park from the rest of the hill. This was constructed between February 1984 and July 1985 as part of the Accrington Easterly By-pass scheme, itself the last section of a larger project to create a dual carriageway route between the M66 and M65 . Hameldon Hill Wind Farm, located on

1890-768: The Borough of Burnley , Huncoat and Baxenden in Hyndburn , and Crawshawbooth , Goodshaw and Loveclough in the Borough of Rossendale . Located on the western side of the Pennines , its summit is the highest point an isolated area, separated from the South Pennines and the West Pennine Moors . The Cliviger Gorge lies to the east, the Rossendale Valley to the south, and the valley of

1995-717: The Gulf of Mexico in the west to Turkey in the east. The orogeny was caused by a series of continental collisions between Laurussia, Gondwana and the Armorican Terrane Assemblage (much of modern-day Central and Western Europe including Iberia ) as the Rheic Ocean closed and Pangea formed. This mountain building process began in the Middle Devonian and continued into the early Permian. The Armorican terranes rifted away from Gondwana during

2100-751: The International Commission on Stratigraphy (ICS) stage, but the Viséan is longer, extending into the lower Serpukhovian . North American geologists recognised a similar stratigraphy but divided it into two systems rather than one. These are the lower carbonate-rich sequence of the Mississippian System and the upper siliciclastic and coal-rich sequence of the Pennsylvanian . The United States Geological Survey officially recognised these two systems in 1953. In Russia, in

2205-677: The Kuznetsk Basin . The northwest to eastern margins of Siberia were passive margins along the Mongol-Okhotsk Ocean on the far side of which lay Amuria. From the mid Carboniferous, subduction zones with associated magmatic arcs developed along both margins of the ocean. The southwestern margin of Siberia was the site of a long lasting and complex accretionary orogen. The Devonian to early Carboniferous Siberian and South Chinese Altai accretionary complexes developed above an east-dipping subduction zone, whilst further south,

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2310-586: The Magnitogorsk island arc , which lay between Kazakhstania and Laurussia in the Ural Ocean , collided with the passive margin of northeastern Laurussia ( Baltica craton ). The suture zone between the former island arc complex and the continental margin formed the Main Uralian Fault , a major structure that runs for more than 2,000 km along the orogen. Accretion of the island arc

2415-684: The Old Red Sandstone , Carboniferous Limestone , Millstone Grit and the Coal Measures . These four units were placed into a formalised Carboniferous unit by William Conybeare and William Phillips in 1822 and then into the Carboniferous System by Phillips in 1835. The Old Red Sandstone was later considered Devonian in age. The similarity in successions between the British Isles and Western Europe led to

2520-592: The River Hyndburn to the west. Pendle Hill stands to the north, across the wide valley of the Lancashire Calder . The name Hameldon is used for two others in the local area, and is possibly the same as Hambledon Hill in Dorset . The second element is likely Old English dūn meaning hill, the first is possibly from hamelian meaning to mutilate or maim. The precise meaning in these cases

2625-784: The 1840s British and Russian geologists divided the Carboniferous into the Lower, Middle and Upper series based on Russian sequences. In the 1890s these became the Dinantian, Moscovian and Uralian stages. The Serpukivian was proposed as part of the Lower Carboniferous, and the Upper Carboniferous was divided into the Moscovian and Gzhelian . The Bashkirian was added in 1934. In 1975, the ICS formally ratified

2730-618: The Arley, Upper and Lower Mountain mines was used to produce high grade metallurgical coke which was in high demand for industry, whereas coal from the Union/Upper Foot mines had a high sulphur content making it unsuitable for making coke. The Union mine is contaminated with in-seam concretions known locally as coal balls or bobbers, spherical concretions, composed of limestone measuring from 0.1 to 1.0 metre in diameter that posed hazards for mining. They were largely responsible for

2835-526: The Bashkirian, the late Moscovian and the latest Kasimovian to mid-Gzhelian are inferred from the disappearance of glacial sediments, the appearance of deglaciation deposits and rises in sea levels. In the early Kasimovian there was short-lived (<1 million years) intense period of glaciation, with atmospheric CO 2 concentration levels dropping as low as 180 ppm. This ended suddenly as a rapid increase in CO 2 concentrations to c. 600 ppm resulted in

2940-764: The Carboniferous Earth's atmosphere, and the coal fueled the Industrial Revolution . During the Pennsylvanian, vast amounts of organic debris accumulated in the peat mires that formed across the low-lying, humid equatorial wetlands of the foreland basins of the Central Pangean Mountains in Laurussia, and around the margins of the North and South China cratons. During glacial periods, low sea levels exposed large areas of

3045-669: The Carboniferous System, with the Mississippian and Pennsylvanian subsystems from the North American timescale, the Tournaisian and Visean stages from the Western European and the Serpukhovian, Bashkirian, Moscovian, Kasimovian and Gzhelian from the Russian. With the formal ratification of the Carboniferous System, the Dinantian, Silesian, Namurian, Westphalian and Stephanian became redundant terms, although

3150-609: The Carboniferous, the Tarim craton lay along the northwestern edge of North China. Subduction along the Kazakhstanian margin of the Turkestan Ocean resulted in collision between northern Tarim and Kazakhstania during the mid Carboniferous as the ocean closed. The South Tian Shan fold and thrust belt , which extends over 2,000 km from Uzbekistan to northwest China, is the remains of this accretionary complex and forms

3255-589: The Cliviger valley. The intersecting Theiveley Lead Mine and nearby Hameldon Faults are some of a smaller number of easterly aligned structures which separate the coalfield from the horizontal strata of Rossendale. Other unnamed faults include one between Altham and Huncoat which is considered to be the boundary between the Burnley and Accrington district. Around the district, 19 coal seams, of varying thickness were exploited over time. The most important were

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3360-703: The Dandy Mine Rock. The drift cover consists primarily of glacial till deposits, which cause poor-drainage soils, meaning the grassland is prone to reed growth. On the northern slopes Castle Clough Brook runs north through a significant valley to join the River Calder , and both Shorten and Clough Brooks, further west, also drain the lower parts of the hill. On the eastern side New Barn Clough also flows north to join Habergham Brook, which along with Hapton Clough forms Green Brook at Spa Wood. In

3465-762: The Early Mississippian, led to the rifting of the Yukon-Tanana terrane and the opening of the Slide Mountain Ocean . Along the northern margin of Laurussia, orogenic collapse of the Late Devonian to Early Mississippian Innuitian orogeny led to the development of the Sverdrup Basin . Much of Gondwana lay in the southern polar region during the Carboniferous. As the plate moved, the South Pole drifted from southern Africa in

3570-513: The Early to Middle Mississippian, carbonate production occurred to depth across the gently dipping continental slopes of Laurussia and North and South China ( carbonate ramp architecture) and evaporites formed around the coastal regions of Laurussia, Kazakhstania, and northern Gondwana. From the late Visean, the cooling climate restricted carbonate production to depths of less than c. 10 m forming carbonate shelves with flat-tops and steep sides. By

3675-491: The Kasimovian covers a period of globally low sea level, which has resulted in disconformities within many sequences of this age. This has created difficulties in finding suitable marine fauna that can used to correlate boundaries worldwide. The Kasimovian currently lacks a defined GSSP; potential sites in the southern Urals, southwest USA and Nashui, Guizhou Province, southwestern China are being considered. The Gzhelian

3780-483: The Late Ordovician . As they drifted northwards the Rheic Ocean closed in front of them, and they began to collide with southeastern Laurussia in the Middle Devonian. The resulting Variscan orogeny involved a complex series of oblique collisions with associated metamorphism , igneous activity, and large-scale deformation between these terranes and Laurussia, which continued into the Carboniferous. During

3885-665: The Late Pennsylvanian, deformation along the Alleghanian orogen became northwesterly-directed compression . The Uralian orogeny is a north–south trending fold and thrust belt that forms the western edge of the Central Asian Orogenic Belt . The Uralian orogeny began in the Late Devonian and continued, with some hiatuses, into the Jurassic . From the Late Devonian to early Carboniferous,

3990-672: The Lower Coal Measures remain. Within the coalfield, the dip in the strata varies from shallow to the south and west but steeper where there are faults . Named faults include the Deerplay Fault in the middle of the district which is associated with a line to west where the Lower Mountain and Upper Foot mines combine to form the Union mine. The Cliviger Valley Fault has a throw of up to 400 metres (1,300 ft) in

4095-701: The Lower/Union and Upper Mountain, Dandy, King and Arley mines. Seams were generally less than 1.5 metres in thickness, frequently less. One notable exception occurs in the Calder Valley near Gawthorpe Hall , where as a result of the absence of the Tim Bobbin Rock which usually separates the King and Fulledge Thin mines, the Padiham Thick mine is up to 5.3 metres thick. Coal extracted from

4200-478: The Moscovian, the waxing and waning of the ice sheets led to cyclothem deposition with mixed carbonate-siliciclastic sequences deposited on continental platforms and shelves. Burnley Coalfield Download coordinates as: The Burnley Coalfield is the most northerly portion of the Lancashire Coalfield . Surrounding Burnley , Nelson , Blackburn and Accrington , it is separated from

4305-637: The Paleo-Tethys to the southwest and Panthalassa to the northeast. Cyclothem sediments with coal and evaporites were deposited across the passive margins that surrounded both continents. The Carboniferous climate was dominated by the Late Paleozoic Ice Age (LPIA), the most extensive and longest icehouse period of the Phanerozoic, which lasted from the Late Devonian to the Permian (365 Ma-253 Ma). Temperatures began to drop during

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4410-412: The Pennsylvanian, cyclothems were deposited in shallow, epicontinental seas across the tropical regions of Laurussia (present day western and central US, Europe, Russia and central Asia) and the North and South China cratons . The rapid sea levels fluctuations they represent correlate with the glacial cycles of the Late Paleozoic Ice Age. The advance and retreat of ice sheets across Gondwana followed

4515-402: The Pennsylvanian, together with widespread glaciation across Gondwana led to major climate and sea level changes, which restricted marine fauna to particular geographic areas thereby reducing widespread biostratigraphic correlations. Extensive volcanic events associated with the assembling of Pangea means more radiometric dating is possible relative to the Mississippian. The Bashkirian Stage

4620-426: The Period. This was not a steady rise, but included peaks and troughs reflecting the dynamic climate conditions of the time. How the atmospheric oxygen concentrations influenced the large body size of arthropods and other fauna and flora during the Carboniferous is also a subject of ongoing debate. The changing climate was reflected in regional-scale changes in sedimentation patterns. In the relatively warm waters of

4725-430: The Permian. The Kazakhstanian microcontinent is composed of a series of Devonian and older accretionary complexes. It was strongly deformed during the Carboniferous as its western margin collided with Laurussia during the Uralian orogen and its northeastern margin collided with Siberia. Continuing strike-slip motion between Laurussia and Siberia led the formerly elongate microcontinent to bend into an orocline . During

4830-432: The Urals and Nashui, Guizhou Province, southwestern China are being considered. The Kasimovian is the first stage in the Upper Pennsylvanian. It is named after the Russian city of Kasimov , and was originally included as part of Nikitin's 1890 definition of the Moscovian. It was first recognised as a distinct unit by A.P. Ivanov in 1926, who named it the " Tiguliferina " Horizon after a type of brachiopod . The boundary of

4935-431: The Urals and Nashui, Guizhou Province, southwestern China for the GSSP are being considered. The GSSP for the base of the Permian is located in the Aidaralash River valley near Aqtöbe , Kazakhstan and was ratified in 1996. The beginning of the stage is defined by the first appearance of the conodont Streptognathodus postfusus . A cyclothem is a succession of non-marine and marine sedimentary rocks , deposited during

5040-414: The Visean of c. 15.3%, although with large uncertainties; and, pyrite records suggest levels of c. 15% early in the Carboniferous, to over 25% during the Pennsylvanian, before dropping back below 20% towards the end. However, whilst exact numbers vary, all models show an overall increase in atmospheric oxygen levels from a low of between 15-20% at the beginning of the Carboniferous to highs of 25-30% during

5145-406: The Zharma-Saur arc formed along the northeastern margin of Kazakhstania. By the late Carboniferous, all these complexes had accreted to the Siberian craton as shown by the intrusion of post-orogenic granites across the region. As Kazakhstania had already accreted to Laurussia, Siberia was effectively part of Pangea by 310 Ma, although major strike-slip movements continued between it and Laurussia into

5250-429: The area to the north, where several smaller reservoirs have also been created, and like Broad Oak Water joins the River Hyndburn in Accrington and ultimately the Calder. The southern slopes are primarily drained by three streams, one falls through Bank Clough in the east, and the others through Whin Hill and Great Cloughs in the west. All join Limy Water , a tributary of the River Irwell . The Burnley Way passes over

5355-477: The average temperature in the tropics c. 24 °C (75 °F) and in polar regions c. -23 °C (-10 °F), whilst during the Early Tournaisian Warm Interval (358-353 Ma) the GAT was c. 22 °C (72 °F), the tropics c. 30 °C (86 °F) and polar regions c. 1.5 °C (35 °F). Overall, for the Ice Age the GAT was c. 17 °C (62 °F), with tropical temperatures c. 26 °C and polar temperatures c. -9.0 °C (16 °F). There are

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5460-410: The base of the Carboniferous System, Mississippian Subsystem and Tournaisian Stage is located at the La Serre section in Montagne Noire , southern France. It is defined by the first appearance of the conodont Siphonodella sulcata within the evolutionary lineage from Siphonodella praesulcata to Siphonodella sulcata . This was ratified by the ICS in 1990. However, in 2006 further study revealed

5565-433: The beginning of the Period to highs of 25-30%. The development of a Carboniferous chronostratigraphic timescale began in the late 18th century. The term "Carboniferous" was first used as an adjective by Irish geologist Richard Kirwan in 1799 and later used in a heading entitled "Coal-measures or Carboniferous Strata" by John Farey Sr. in 1811. Four units were originally ascribed to the Carboniferous, in ascending order,

5670-406: The centre a number of small streams combine to form Shaw Brook, which flows on the eastern side of Hapton and joins Green Brook just before its confluence with the Calder in Padiham . On the western side Warmden Brook forms to the south of the Great Hameldon summit, feeding the Mitchell's House Reservoirs and becoming Broad Oak Water after it collects the stream from Tag Clough. Pleck Brook drains

5775-410: The charcoal record and pyrite). Results from these different methods for the Carboniferous vary. For example: the increasing occurrence of charcoal produced by wildfires from the Late Devonian into the Carboniferous indicates increasing oxygen levels, with calculations showing oxygen levels above 21% for most of the Carboniferous; halite gas inclusions from sediments dated 337-335 Ma give estimates for

5880-402: The city of Visé , Liège Province , Belgium. In 1967, the base of the Visean was officially defined as the first black limestone in the Leffe facies at the Bastion Section in the Dinant Basin . These changes are now thought to be ecologically driven rather than caused by evolutionary change, and so this has not been used as the location for the GSSP. Instead, the GSSP for the base of the Visean

5985-488: The closure of Bank Hall Colliery, the area's largest and deepest pit. Coal was exploited in the 13th century at Trawden near Colne where receipts are mentioned in a rent roll from 1295. Coal was also bought at Cliviger . The first coals were extracted at the outcrops before shaft and adit mining were adopted. The coal industry grew in the 16th and 17th centuries, developing from manorial tenants who dug coal for their own use into fixed term leases in return for rent. Coal

6090-411: The complexity of the geology. The ICS subdivisions from youngest to oldest are as follows: The Mississippian was proposed by Alexander Winchell in 1870 named after the extensive exposure of lower Carboniferous limestone in the upper Mississippi River valley. During the Mississippian, there was a marine connection between the Paleo-Tethys and Panthalassa through the Rheic Ocean resulting in

6195-437: The continental shelves. Major river channels, up to several kilometres wide, stretched across these shelves feeding a network of smaller channels, lakes and peat mires. These wetlands were then buried by sediment as sea levels rose during interglacials . Continued crustal subsidence of the foreland basins and continental margins allowed this accumulation and burial of peat deposits to continue over millions of years resulting in

6300-407: The development of a common European timescale with the Carboniferous System divided into the lower Dinantian , dominated by carbonate deposition and the upper Silesian with mainly siliciclastic deposition. The Dinantian was divided into the Tournaisian and Viséan stages. The Silesian was divided into the Namurian , Westphalian and Stephanian stages. The Tournaisian is the same length as

6405-475: The early Carboniferous Kanimblan Orogeny . Continental arc magmatism continued into the late Carboniferous and extended round to connect with the developing proto-Andean subduction zone along the western South American margin of Gondwana. Shallow seas covered much of the Siberian craton in the early Carboniferous. These retreated as sea levels fell in the Pennsylvanian and as the continent drifted north into more temperate zones extensive coal deposits formed in

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6510-416: The early Carboniferous in North China. However, bauxite deposits immediately above the regional mid Carboniferous unconformity indicate warm tropical conditions and are overlain by cyclothems including extensive coals. South China and Annamia (Southeast Asia) rifted from Gondwana during the Devonian. During the Carboniferous, they were separated from each other and North China by the Paleoasian Ocean with

6615-503: The early Carboniferous to eastern Antarctica by the end of the period. Glacial deposits are widespread across Gondwana and indicate multiple ice centres and long-distance movement of ice. The northern to northeastern margin of Gondwana (northeast Africa, Arabia, India and northeastern West Australia) was a passive margin along the southern edge of the Paleo-Tethys with cyclothem deposition including, during more temperate intervals, coal swamps in Western Australia. The Mexican terranes along

6720-406: The end of the Carboniferous, extension and rifting across the northern margin of Gondwana led to the breaking away of the Cimmerian Terrane during the early Permian and the opening of the Neo-Tethys Ocean . Along the southeastern and southern margin of Gondwana (eastern Australia and Antarctica), northward subduction of Panthalassa continued. Changes in the relative motion of the plates resulted in

6825-403: The end of the Devonian, even if the specific enzymes used by basidiomycetes had not. The second theory is that the geographical setting and climate of the Carboniferous were unique in Earth's history: the co-occurrence of the position of the continents across the humid equatorial zone, high biological productivity, and the low-lying, water-logged and slowly subsiding sedimentary basins that allowed

6930-425: The formation of thick and widespread coal formations. During the warm interglacials, smaller coal swamps with plants adapted to the temperate conditions formed on the Siberian craton and the western Australian region of Gondwana. There is ongoing debate as to why this peak in the formation of Earth's coal deposits occurred during the Carboniferous. The first theory, known as the delayed fungal evolution hypothesis,

7035-404: The hill gives-out a spur of child peaks, terminating at Cribden Hill near Haslingden . At the eastern end are Black, Nutshaw and Burnt hills. The underlying geology of the area consists of Lower Westphalian coal measures of the Carboniferous era , while the hills are formed of Carboniferous sandstones, ranging from millstone grits to finer grained stone such as the Dyneley Knott flags and

7140-472: The hill, following the old road from Hapton to Haslingden as it climbs Hameldon, before descending to Clow Bridge . There is an ancient local legend that the Devil once jumped from Hameldon to Pendle Hill where he gathered rocks in an apron, and threw a boulder aimed at Clitheroe Castle . Without Royal permission Sir John Towneley enclosed land on Horelaw Hill, to the north of Clowbridge Reservoir, to connect his deer park to Towneley Hall . Some of this

7245-451: The larger southern part by an area of Millstone Grit that forms the Rossendale anticline . Occupying a syncline , it stretches from Blackburn past Colne to the Yorkshire border where its eastern flank is the Pennine anticline. The Burnley Coalfield which surrounds Burnley, Nelson, Blackburn and Accrington is the most northerly portion of the Lancashire Coalfield . The Rossendale anticline, an area of Millstone Grit , separates it from

7350-428: The larger southern part of the coalfield. Occupying a syncline bounded by the Pendle monocline to the north, the coalfield stretches from Blackburn, eastwards past Colne to the Pennine anticline on the border with Yorkshire. The coalfield's seams are the Westphalian Coal Measures of the Carboniferous period , laid down from the vegetation of tropical swampy forests more than 300 million years ago but here, only

7455-510: The last deep mine operating on the Burnley Coalfield, closing in 1982. A number of smaller quarries at Hameldon Scouts had grown by 1886 into the Hameldon Quarries, when Henry Heys and Co took over the operation. It supplied large quantities of flagstones for the construction of mills in Burnley and Padiham . At that time tram roads connected the main site to another at Snipe Rake and to a facility at Park Gate Farm. These quarries ceased operation in 1909, but extensive remains still exist. Since

7560-642: The late 19th century, the Accrington area has been known for the production of Accrington brick . Brick-clay has been extracted from the Huncoat Quarry at Rakehead, which was connected to the Huncoat Plastic Brick and Terracotta Company, and was still being operated by Ibstock in the early 2000s. The Mitchell's House Reservoirs in the upper valley of Warmden Brook, are two bodies of water separated by an intermediate embankment, forming

7665-456: The late Carboniferous. Land arthropods such as arachnids (e.g. trigonotarbids and Pulmonoscorpius ), myriapods (e.g. Arthropleura ) and especially insects (particularly flying insects ) also underwent a major evolutionary radiation during the late Carboniferous. Vast swaths of forests and swamps covered the land, which eventually became the coal beds characteristic of the Carboniferous stratigraphy evident today. The later half of

7770-592: The late Devonian with a short-lived glaciation in the late Famennian through Devonian–Carboniferous boundary, before the Early Tournaisian Warm Interval. Following this, a reduction in atmospheric CO 2 levels, caused by the increased burial of organic matter and widespread ocean anoxia led to climate cooling and glaciation across the south polar region. During the Visean Warm Interval glaciers nearly vanished retreating to

7875-533: The latter three are still in common use in Western Europe. Stages can be defined globally or regionally. For global stratigraphic correlation, the ICS ratify global stages based on a Global Boundary Stratotype Section and Point (GSSP) from a single formation (a stratotype ) identifying the lower boundary of the stage. Only the boundaries of the Carboniferous System and three of the stage bases are defined by global stratotype sections and points because of

7980-432: The majority of a cyclothem sequence occurred during falling sea levels, when rates of erosion were high, meaning they were often periods of non-deposition. Erosion during sea level falls could also result in the full or partial removal of previous cyclothem sequences. Individual cyclothems are generally less than 10 m thick because the speed at which sea level rose gave only limited time for sediments to accumulate. During

8085-545: The many coal beds formed globally during that time. The first of the modern "system" names, it was coined by geologists William Conybeare and William Phillips in 1822, based on a study of the British rock succession. Carboniferous is the period during which both terrestrial animal and land plant life was well established. Stegocephalia (four-limbed vertebrates including true tetrapods ), whose forerunners ( tetrapodomorphs ) had evolved from lobe-finned fish during

8190-683: The mid Carboniferous, the South American sector of Gondwana collided obliquely with Laurussia's southern margin resulting in the Ouachita orogeny. The major strike-slip faulting that occurred between Laurussia and Gondwana extended eastwards into the Appalachian Mountains where early deformation in the Alleghanian orogeny was predominantly strike-slip. As the West African sector of Gondwana collided with Laurussia during

8295-456: The near worldwide distribution of marine faunas and so allowing widespread correlations using marine biostratigraphy . However, there are few Mississippian volcanic rocks , and so obtaining radiometric dates is difficult. The Tournaisian Stage is named after the Belgian city of Tournai . It was introduced in scientific literature by Belgian geologist André Dumont in 1832. The GSSP for

8400-403: The northern side of the hill, became operational in 2007. Initially consisting of three turbines , a further three were added around 2012. Hameldon has two summits, the highest point is known as Great Hameldon and attains 1,343 feet (409 m). To the east the ground falls slightly before gradually rising to 1,305 feet (398 m) at a point known as Great Hill. To the south of Great Hameldon,

8505-515: The northwestern Gondwana margin, were affected by the subduction of the Rheic Ocean. However, they lay to west of the Ouachita orogeny and were not impacted by continental collision but became part of the active margin of the Pacific. The Moroccan margin was affected by periods of widespread dextral strike-slip deformation, magmatism and metamorphism associated with the Variscan orogeny. Towards

8610-552: The now lost Birtwistle, thought to have been located somewhere within Hapton civil parish . Sir John Towneley obtained the first of two licenses to create deer park in Hapton in 1496-1497 and is thought to have built Hapton Tower within it. After the King's commissioners re-let Rossendale to local farmers in 1507, Towneley in 1514 enlarged his deer park to embrace 1100 Lancashire acres (as much as 2,000 acres (810 ha)) making it

8715-547: The old Fulledge Colliery was redeveloped and linked by a tramway to canal. Tramways came into more common use in the 1880s and several collieries in the town were linked by the system. Several collieries were nationalised under the Coal Industry Nationalisation Act 1946 on vesting day, 1 January 1947. After the 1950s much of the area was opencasted . Coal was opencast at Helm, Royal Zone, Gawthorpe Hall and Tipping Hill. Hill Top Colliery ,

8820-420: The older dam, before both could be declared watertight. Subsidence problems that have effected the reservoirs have likely been exacerbated by coal-mining underneath it, which did not cease until 1905. During World War II a network of Starfish site bombing decoys where constructed in the area designed to protect Accrington . Two of the sites are on Hameldon, one near Heights Farm on the south-eastern side, and

8925-431: The other on the south-western side overlooking the reservoir. The Heights Farm site is protected as a Scheduled monument . The Met Office north west England weather radar is situated on Hameldon Hill. Commissioned in 1975 this was the first unmanned installation of the 15 that form the national weather radar network. Nearby are a number of communication masts including one that broadcasts BBC Radio Lancashire . Today

9030-426: The peat mires. As fully marine conditions were established, limestones succeeded these marginal marine deposits. The limestones were in turn overlain by deep water black shales as maximum sea levels were reached. Ideally, this sequence would be reversed as sea levels began to fall again; however, sea level falls tend to be protracted, whilst sea level rises are rapid, ice sheets grow slowly but melt quickly. Therefore,

9135-516: The period experienced glaciations , low sea level, and mountain building as the continents collided to form Pangaea . A minor marine and terrestrial extinction event, the Carboniferous rainforest collapse , occurred at the end of the period, caused by climate change. Atmospheric oxygen levels, originally thought to be consistently higher than today throughout the Carboniferous, have been shown to be more variable, increasing from low levels at

9240-491: The preceding Devonian period, became pentadactylous during the Carboniferous. The period is sometimes called the Age of Amphibians because of the diversification of early amphibians such as the temnospondyls , which became dominant land vertebrates, as well as the first appearance of amniotes including synapsids (the clade to which modern mammals belong) and sauropsids (which include modern reptiles and birds) during

9345-464: The presence of Siphonodella sulcata below the boundary, and the presence of Siphonodella praesulcata and Siphonodella sulcata together above a local unconformity . This means the evolution of one species to the other, the definition of the boundary, is not seen at the La Serre site making precise correlation difficult. The Viséan Stage was introduced by André Dumont in 1832 and is named after

9450-892: The proto-Andes in Bolivia and western Argentina and the Pan-African mountain ranges in southeastern Brazil and southwest Africa. The main phase of the LPIA (c. 335-290 Ma) began in the late Visean, as the climate cooled and atmospheric CO 2 levels dropped. Its onset was accompanied by a global fall in sea level and widespread multimillion-year unconformities. This main phase consisted of a series of discrete several million-year-long glacial periods during which ice expanded out from up to 30 ice centres that stretched across mid- to high latitudes of Gondwana in eastern Australia, northwestern Argentina, southern Brazil, and central and Southern Africa. Isotope records indicate this drop in CO 2 levels

9555-544: The remains of a chambered long barrow dating from the early Neolithic to early Bronze Age periods. Huncoat , on the northern slope, is one of the few places mentioned in the brief details of the Blackburnshire hundred in the Domesday Book , with King Edward holding two carucates of land here. The settlements of Dunnockshaw, Loveclough, Goodshaw and Crawshawbooth along the valley of Limy Water to

9660-640: The sea. Cyclothem lithologies vary from mudrock and carbonate-dominated to coarse siliciclastic sediment-dominated sequences depending on the paleo-topography, climate and supply of sediments to the shelf. The main period of cyclothem deposition occurred during the Late Paleozoic Ice Age from the Late Mississippian to early Permian, when the waxing and waning of ice sheets led to rapid changes in eustatic sea level . The growth of ice sheets led global sea levels to fall as water

9765-554: The second largest in historic Lancashire after that of the Earl of Derby at Knowsley . Its irregular boundaries covered much of the eastern part of the hill, stretching from the plateau of Great Hill, north to Bentley Wood Green. By 1615 deer were no longer kept in the park, though it was not divided into the present-day farms until the early 18th century. Considered part of the Burnley Coalfield , evidence of bell pits ,

9870-650: The south east, can trace their history to vaccaries (Medieval cattle ranches) in the Forest of Rossendale . The Towneley family of Burnley's Towneley Hall are descendants of the Del la Legh family, several generations of whom, held the position of chief stock master of the vaccaries in Rossendale and the other forests of the Blackburn Hundred . During the 14th century they would acquire the manors of Hapton and

9975-571: The suture between Kazakhstania and Tarim. A continental magmatic arc above a south-dipping subduction zone lay along the northern North China margin, consuming the Paleoasian Ocean. Northward subduction of the Paleo-Tethys beneath the southern margins of North China and Tarim continued during the Carboniferous, with the South Qinling block accreted to North China during the mid to late Carboniferous. No sediments are preserved from

10080-410: The thick accumulation of peat were sufficient to account for the peak in coal formation. During the Carboniferous, there was an increased rate in tectonic plate movements as the supercontinent Pangea assembled. The continents themselves formed a near circle around the opening Paleo-Tethys Ocean, with the massive Panthalassic Ocean beyond. Gondwana covered the south polar region. To its northwest

10185-568: The uplift and erosion of the more mafic basement rocks of the Central Pangea Mountains at this time, CO 2 levels dropped as low as 175 ppm and remained under 400 ppm for 10 Ma. Temperatures across the Carboniferous reflect the phases of the LPIA. At the extremes, during the Permo-Carboniferous Glacial Maximum (299-293 Ma) the global average temperature (GAT) was c. 13 °C (55 °F),

10290-547: Was common land and the injustice, which was not reversed until 1556, made him unpopular with the local people. A tradition arose that his ghost wanders the hills calling "Be warned! Lay out! Be warned! Lay out! Around Horelaw and Hollin Hey Clough". Notes Citations Carboniferous The name Carboniferous means " coal -bearing", from the Latin carbō (" coal ") and ferō ("bear, carry"), and refers to

10395-492: Was Laurussia. These two continents slowly collided to form the core of Pangea. To the north of Laurussia lay Siberia and Amuria . To the east of Siberia, Kazakhstania , North China and South China formed the northern margin of the Paleo-Tethys, with Annamia laying to the south. The Central Pangean Mountains were formed during the Variscan - Alleghanian - Ouachita orogeny. Today their remains stretch over 10,000 km from

10500-506: Was complete by the Tournaisian, but subduction of the Ural Ocean between Kazakhstania and Laurussia continued until the Bashkirian when the ocean finally closed and continental collision began. Significant strike-slip movement along this zone indicates the collision was oblique. Deformation continued into the Permian and during the late Carboniferous and Permian the region was extensively intruded by granites . The Laurussian continent

10605-625: Was formed by the collision between Laurentia , Baltica and Avalonia during the Devonian. At the beginning of the Carboniferous, some models show it at the equator, whilst others place it further south. In either case, the continent drifted northwards, reaching low latitudes in the northern hemisphere by the end of the Period. The Central Pangean Mountain drew in moist air from the Paleo-Tethys Ocean resulting in heavy precipitation and

10710-646: Was lock away in glaciers. Falling sea levels exposed large tracts of the continental shelves across which river systems eroded channels and valleys and vegetation broke down the surface to form soils . The non-marine sediments deposited on this erosional surface form the base of the cyclothem. As sea levels began to rise, the rivers flowed through increasingly water-logged landscapes of swamps and lakes. Peat mires developed in these wet and oxygen-poor conditions, leading to coal formation. With continuing sea level rise, coastlines migrated landward and deltas , lagoons and esturaries developed; their sediments deposited over

10815-508: Was mined all around Burnley, mostly from shafts. By 1800, more than a dozen pits had been sunk in central Burnley. The arrival of the Leeds and Liverpool Canal was a catalyst for industrialisation as was the coming of the Lancashire and Yorkshire Railway line through Burnley to Colne in 1848. In the 1840s some old small pits such as Cleggs Pit and Habergham closed and larger collieries were sunk at Bank House Colliery, Whittlefield Colliery and

10920-578: Was proposed by Russian stratigrapher Sofia Semikhatova in 1934. It was named after Bashkiria , the then Russian name of the republic of Bashkortostan in the southern Ural Mountains of Russia. The GSSP for the base of the Pennsylvanian Subsystem and Bashkirian Stage is located at Arrow Canyon in Nevada , US and was ratified in 1996. It is defined by the first appearance of the conodont Declinognathodus noduliferus . Arrow Canyon lay in

11025-459: Was triggered by tectonic factors with increased weathering of the growing Central Pangean Mountains and the influence of the mountains on precipitation and surface water flow. Closure of the oceanic gateway between the Rheic and Tethys oceans in the early Bashkirian also contributed to climate cooling by changing ocean circulation and heat flow patterns. Warmer periods with reduced ice volume within

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