The Norwich Crag Formation is a stratigraphic unit of the British Pleistocene Epoch. It is the second youngest unit of the Crag Group, a sequence of four geological formations spanning the Pliocene to Lower Pleistocene transition in East Anglia. It was deposited between approximately 2.4 and 1.8 million years ago, during the Gelasian Stage.
The Norwich Crag is a marginal facies of the thicker, much better developed sedimentary sequence in the southern North Sea basin. It outcrops in the eastern half of the counties of Norfolk and Suffolk, and is also represented in Essex and Hertfordshire. It was deposited in a near-shore environment, and comprises a range of sands, silty clays and flint-rich gravels representing various transgressive and regressive marine episodes. It rests in some places on the Red Crag Formation and in others unconformably on Coralline Crag, Palaeogene formations and Chalk Group bedrock. It is overlain by the Wroxham Crag Formation, and unconformably by the Kesgrave Catchment Subgroup (part of the Dunwich Group) and Mid Pleistocene glacigenic deposits.
Norwich Crag fossil fauna and flora have been studied since the 19th century for information about environmental conditions during the early Pleistocene. They provide evidence for a general climatic cooling trend from the Pliocene to the Pleistocene.
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The NorwichCragFormation is a stratigraphic unit of the British Pleistocene Epoch. It is the second youngest unit of the Crag Group, a sequence of four...
The Red CragFormation is a geological formation in England. It outcrops in south-eastern Suffolk and north-eastern Essex. The name derives from its iron-stained...
rock Crag Group, a geological group outcropping in East Anglia, UK Coralline CragFormationNorwichCragFormation Red CragFormation Wroxham Crag Formation...
discoveries of eoliths in the early 20th century – in the Red CragFormation and NorwichCragFormation of East Anglia by J. Reid Moir and E. Ray Lankester and...
dinoflagellates to be constructed for horizons of the Red Crag and NorwichCragFormations, and for these formations to be thus correlated with strata of equivalent...
constituent formations of the Crag Group are the Coralline Crag (mid to late Pliocene); the Red Crag (late Pliocene / early Pleistocene); the NorwichCrag (early...
The Coralline CragFormation is a geological formation in England. It is a series of marine deposits found near the North Sea coast of Suffolk and characterised...
foundation comprises NorwichCragFormation and Red CragFormation bedrock of Pleistocene age above Eocene London Clay. The Crag deposits predominantly...
tooth and a right inner ear periotic bone from the English Red CragFormation of the Crag Group, dating to the Early Pleistocene, was referred by English...
regionally important geological site. The cliffs are formed of NorwichCragFormation. The layers of large flint cobbles are known locally as the "Westleton...
nationally important for its exposures of the Lower Pleistocene NorwichCragFormation, its vegetated shingle features, saline lagoons, flood-plain fens...
Lower Pleistocene. Bramerton Common Pit is the type site of the NorwichCragFormation and Blakes Pit is the type site of the Bramertonian Stage. Both...
Anglian Stage resting on a bedrock of Cretaceous chalk and the NorwichCragFormation. Chalk was deposited 75 million years ago, when the area was part...
Arthur R. Sweet (2013). "First mammals from the Paleocene Porcupine Hills Formation of southwestern Alberta, Canada". Canadian Journal of Earth Sciences....
Lynn and West Norfolk Borough Council, North Norfolk District Council, Norwich City Council and South Norfolk District Council. The county is bounded...
Cawston and Norwich to the Suffolk border east of Diss. The sequence is divided into the Red Crag, NorwichCrag and Wroxham Cragformations. Some of the...
The Cromer Forest-bed Formation, sometimes known as the Cromer Forest Bed, is a geological formation in Norfolk, England. It consists of river gravels...
Sciences 1975 "Norwich" England and Wales map sheet 161 Solid and Drift edition 1:50,000 Keyworth, Nottingham IGS British Geological Survey. "Crag Group". BGS...
Northumberland and Cumbria, but also feature further south, for example at Creswell Crags. With the arrival of Roman culture in the 1st century, various forms of...
Brimham Rocks, once known as Brimham Crags, is a 183.9-hectare (454-acre) biological Site of Special Scientific Interest (SSSI) and Geological Conservation...
Suffolk. The Suffolk coastline is a complex habitat, formed by London clay and crag underlain by chalk and therefore susceptible to erosion. It contains several...
Weardale Railway to Frosterley, with a Branch terminating at or near Bishopley Crag in Stan hope in Weardale, all in the County of Durham. (Repealed by Stockton...
ringing had developed rapidly in the nineteenth century helped by the formation of the many local ringing associations which had sprung up. However, the...
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