Corallian Group
Corallian Group | |
---|---|
Ma | |
Type | Group |
Sub-units | |
Underlies | Oxford Clay Formation, West Walton Formation |
Thickness | 100 m (330 ft) |
Lithology | |
Primary | limestone, marl, sandstone, siltstone, mudstone. |
Location | |
Region | England |
Country | United Kingdom |
Extent | Dorset to Oxfordshire, North Yorkshire |
The Corallian Group or Corallian Limestone is a
A ridge of Corallian Limestone rises above the
Hilly outcrops above this corallian ridge, composed of Lower Greensand, occur at Badbury Hill, Faringdon (Folly Hill) and Boars Hill.
Softer sandy deposits occur within the Corallian, found for example at Faringdon, Shellingford and Hatford in Oxfordshire, where the sands and gravels are extensively quarried.
The Corallian Limestone aquifer is present at outcrop in Yorkshire and in the Cotswolds.[2] In Yorkshire it consists of limestones and grits up to about 110 m thick, thinning to about 20 m towards the south of the region, where the limestones are progressively replaced by clay. It is typically well jointed and gives rise to numerous springs. Here it yields up to 15 L/sec. In the Cotswolds the aquifer is up to 40 m thick, give yields of 5 to 10 L/sec, with water quality becoming increasingly saline down dip as the aquifer becomes confined in the Wessex Basin.
In England, Corallian Limestone is to be found in Dorset,[3] Wiltshire, Oxfordshire, Buckinghamshire, Cambridgeshire, Lincolnshire and Yorkshire.
The most noted scholar of the Corallian strata of England was the geologist W.J. Arkell (1904–1958).
See also
References
- ^ "Corallian Group". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 14 December 2014.
- ^ "The Corallian Limestone as an aquifer". British Geological Survey. Retrieved 9 December 2016.
- ^ "Fifehead Wood Management Plan 2010 - 2015" (PDF). Woodland Trust. p. 6. Retrieved 10 April 2013.[permanent dead link]
External links
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.