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Craven Basin
The Craven Basin is a sedimentary basin in northern England, having the shape of a southerly-tilted graben which was active during the Carboniferous period. It is one of a series of such basins which developed across northern England in this period separating upstanding blocks which were typically underlain by buoyant granites. The basin trends roughly east–west and is bounded by the Lake District block to the northwest, the Askrigg Block to the northeast and the Central Lancashire High to the south. One distinct section of the basin is a half graben which contains over 3km thickness of late Devonian to Courceyan strata and is referred to as the Bowland Sub-basin. These basins resulted from the crust of the region being subjected to a north–south lateral tension regime which began in the late Devonian and lasted through until the Visean. Fill The proven sedimentary fill in the Craven Basin starts with Courceyan age mudstones and limestones of the Chatburn Limestone Gro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sedimentary Basin
Sedimentary basins are region-scale depressions of the Earth's crust where subsidence has occurred and a thick sequence of sediments have accumulated to form a large three-dimensional body of sedimentary rock. They form when long-term subsidence creates a regional depression that provides Accommodation (geology), accommodation space for accumulation of sediments. Over millions or tens or hundreds of millions of years the deposition of sediment, primarily gravity-driven transportation of water-borne eroded material, acts to fill the depression. As the sediments are buried, they are subject to increasing pressure and begin the processes of compaction (geology), compaction and lithification that transform them into sedimentary rock. Sedimentary basins are created by deformation of Earth's lithosphere in diverse geological settings, usually as a result of plate tectonics, plate tectonic activity. Mechanisms of crustal deformation that lead to subsidence and sedimentary basin formati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chatburn Limestone Group
Chatburn is a village, civil parish and electoral ward in the Ribble Valley, East Lancashire, England. The population of the civil parish at the 2011 census was 1,102. Situated in a hollow between two ridges north-east of Clitheroe, just off the A59 road, relatively near Pendle Hill south-east of the village. Lanehead quarry is situated to the West at the termination of Chatburn Old Road. Ribble lane at 240 above sea level leads down to the River Ribble North of the village, the top of Downham road being 150 feet higher. The parish adjoins the Ribble Valley parishes of Grindleton, Sawley, Rimington, Downham, Worston, Clitheroe and West Bradford. History The village itself can be dated back to Anglo-Saxon times; it takes its name (as does the lowest Avenue) from one of the most distinguished characters of that time, St Chad, and having a brook (or burn) hence the name. The village sits outside the Forest of Bowland and was never considered part of the ancient Lordship of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of England
The geology of England is mainly sedimentary. The youngest rocks are in the south east around London, progressing in age in a north westerly direction.Southampton University retrieved 21/1/07 The marks the division between younger, softer and low-lying rocks in the south east and the generally older and harder rocks of the north and west which give rise to higher relief in those regions. The geology of England is recognisable in the landscape of its , the building materials of its towns and its regional |
Cracoe
Cracoe is a small village and civil parish in the Craven district of North Yorkshire, England. It is situated near to Rylstone and about 6 miles south-west of Grassington. Cracoe has an estimated population of 160 residents, measured at 178 in the 2011 census. Cracoe is a village which is also situated near Rylstone beneath Barden Fell and the twin skyline landmarks of Rylstone Cross and Cracoe Pinnacle in the Yorkshire Dales. Evidence of an army training camp can be seen on the south-east edge of the village. The circular earthworks visible from Fell Lane are searchlight battery emplacements. The village is located 5 and a half miles north-west of Skipton. The name of the village can be seen as famous in geological circles - for the nearby Cracoe Reef Knolls, a series of limestone hills which are geological remnants of an ancient coral reef. Cracoe can also be seen as a township in Burnsall parish. It has a post office under the Skipton area. The Parish covers roughly 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Settle, North Yorkshire
Settle is a market town and civil parish in the Craven district of North Yorkshire, England. Historically in the West Riding of Yorkshire, it is served by Settle railway station located near the town centre, and Giggleswick railway station which is a mile away. It is from Leeds Bradford Airport. The main road through Settle is the B6480, which links to the A65, connecting Settle to Leeds, Ilkley, Skipton and Kendal. The town had a population of 2,421 in the 2001 Census, increasing to 2,564 at the 2011 Census. History Settle is thought to have 7th-century Anglian origins, its name being the Angle word for settlement. Craven in the ''Domesday Book'' shows that until 1066 Bo was the lord of Settle but after the Harrying of the North (1069–1071) the land was granted to Roger de Poitou. In 1249 a market charter was granted to Henry de Percy, 7th feudal baron of Topcliffe by Henry III. A market square developed and the main route through the medieval town was aligned on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reef Knoll
A reef knoll is a land-based landform that comprises an immense pile of calcareous material that accumulated on a previously existing ancient sea floor. At the time of its accumulation it may have had enough structure from organisms such as sponges to have been free-standing and to withstand the sea currents as material accumulated, and was likely an atoll. Another possibility is the remains of deep water coral. Such structures are thus often fossil-rich. A bioherm is a sedimentary rocky landform enclosed or surrounded by rock of different origin. A biostrome is a distinctly bedded or broadly lenticular sedimentary rocky landform. Krumbein defines these terms as types of stromatolites: "Distinctly bedded, widely extensive, blanketlike build-ups are biostromes. Nodular, biscuit-like, dome-shaped or columnar stromatolites are also referred to as bioherms". England Examples on the Derbyshire/Staffordshire border include Thorpe Cloud and Bunster Hill in southern Dovedale, and also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Craven Fault System
The Craven Fault System is the name applied by geologists to the group of crustal faults in the Pennines that form the southern edge of the Askrigg Block and which partly bounds the Craven Basin. Sections of the system's component faults which include the North, Middle and South Craven faults and the Feizor FaultBritish Geological Survey 1:50,000 scale geological map (England and Wales) sheet 60 ''Settle'' are evident at the surface in the form of degraded faults scarps where Carboniferous Limestone abuts millstone grit. The fault system is approximately coincident with the southwestern edge of the Yorkshire Dales National Park and the northeastern edge of the Bowland Fells. Location The Craven Faults are major crustal fractures across the Pennines. These faults constitute a zone crossing the backbone of England from west to east commencing near Leck, Lancashire at then branching three ways: * The North Craven Fault extends about to . * The Mid Craven Fault extends about ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sandstone
Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface. Like uncemented sand, sandstone may be any color due to impurities within the minerals, but the most common colors are tan, brown, yellow, red, grey, pink, white, and black. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions. Rock formations that are primarily composed of sandstone usually allow the percolation of water and other fluids and are porous enough to store large quantities, making them valuable aquifers and petroleum reservoirs. Quartz-bearing sandstone can be changed into quartzite through metamorphism, usually related to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unconformity
An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval of time before deposition of the younger layer, but the term is used to describe any break in the sedimentary geologic record. The significance of angular unconformity (see below) was shown by James Hutton, who found examples of Hutton's Unconformity at Jedburgh in 1787 and at Siccar Point in 1788. The rocks above an unconformity are younger than the rocks beneath (unless the sequence has been overturned). An unconformity represents time during which no sediments were preserved in a region or were subsequently eroded before the next deposition. The local record for that time interval is missing and geologists must use other clues to discover that part of the geologic history of that area. The interval of geologic time not represented is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Craven Group
The Craven Group is a lithostratigraphical term referring to the succession of mudstone and limestone rock strata which occur in certain parts of northern and central England and northeast Wales in the United Kingdom within the Chadian to Yeadonian sub-Stages of the Carboniferous Period. Other lithologies including sandstones, siltstones and chert occur within the group. The Group is subdivided into numerous formations, some of which previously enjoyed group status. In stratigraphic order (uppermost/youngest at top), these are: *Bowland Shale Formation (mudstone and siltstone) *Pendleside Limestone Formation (interbedded limestone and mudstone, conglomerate) *Hodderense Limestone Formation *Hodder Mudstone Formation (limestone and mudstone) The Craven Group unconformably overlies the Bowland High Group and elsewhere the Clwyd Limestone Group. It is succeeded (overlain) by the Millstone Grit GroupBritish Geological Survey 1:625,000 scale geological map ''Bedrock geology: UK ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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