| Computer Code: |
LOCR |
Preferred Map Code: |
LCRE |
| Status Code: |
Full |
| Age range: |
Early Cretaceous Epoch (KL)
— Early Cretaceous Epoch (KL) |
| Lithological Description: |
The unit comprises a succession of sedimentary rocks dominated by mudstone or clay and sandstone, with subordinate amounts of calcareous mudstone and argillaceous limestone, and at the top in Yorkshire, Lincolnshire and the southern North Sea, chalk.
This chronostratigraphic unit does not appear on BGS geological maps, including the 1:625 000 scale Bedrock Geology UK North and South maps (BGS 2007a, b) where formal lithostratigraphical units represent strata of this age. It appears in the UK3D fence diagram model which was developed from the digital 1:625 000 scale map data, where onshore in the UK it forms subcrops in Yorkshire and Lincolnshire comprising two named standalone lithostratigraphic formations (the Speeton Clay and Hunstanton formations). Offshore in the North Sea it comprises the Cromer Knoll Group, also concealed, and around south-west England it comprises sedimentary rocks at outcrop and concealed, that are correlated with onshore Purbeck and Wealden groups and Gault Clay and Upper Greensand formations, all of Lower Cretaceous (Berriasian to Albian) age. It comprises a succession of sedimentary rocks dominated by mudstone or clay and sandstone, with subordinate amounts of calcareous mudstone and argillaceous limestone, and at the top in Yorkshire, Lincolnshire and the southern North Sea, chalk. More information about the above Lower Cretaceous rocks can be found in the BGS Regional Guide for Eastern England (Kent, 1980), and the BGS Offshore Regional Reports for the southern North Sea (Cameron et al., 1992), Moray Firth (Andrews et al., 1990), western English Channel (Evans, 1990) and Cardigan Bay and the Bristol Channel (Tappin et al., 1994). |
| Definition of Lower Boundary: |
none recorded or not applicable
|
| Definition of Upper Boundary: |
none recorded or not applicable
|
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
Onshore in the UK3D model, the unit occurs in eastern North Yorkshire, the East Riding of Yorkshire and north Lincolnshire, almost entirely concealed beneath Upper Cretaceous rocks. Offshore in the UK3D model the unit occurs close to the north coast of the Moray Firth, and very locally in the Bristol Channel and Western Approaches. |
| Parent Unit: |
Not Applicable (-)
|
| Previous Name(s): |
Lower Cretaceous Rocks [Obsolete Code Due To Duplication: Use LOCR]
(LCRE)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Tappin, D R, Chadwick, R A, Jackson, A A, Wingfield, R T R and Smith, N J P. 1994. United Kingdom offshore regional report; the geology of Cardigan Bay and Bristol Channel. (London: HMSO for the British Geological Survey.) |
| National Bedrock Fence Diagram of the United Kingdom - UK3D_v2015 doi:10.5285/ 54057516-dec9-48b7-a717-0c341a3846dc |
| Evans, C D R. 1990. The geology of the western English Channel and its western approaches. British Geological Survey United Kingdom offshore regional report. |
| BGS 1:625 000 scale Bedrock Geology UK North and South geological maps (BGS 2007a, b) |
| Andrews, I J, Long, D, Richards, P C, Thomson, A R, Brown, S, Chesher, J A, and McCormac, M. 1990. The geology of the Moray Firth. (London: British Geological Survey.) |
| Cameron, T D J, Crosby, A, Balson, P S, Jeffery, D H, Lott, G K, Bulat, J, and Harrison, D J. 1992. The geology of the southern North Sea. United Kingdom offshore regional report. (London: HMSO for the British Geological Survey.) |
| Kent, P E. 1980. Eastern England from the Tees to The Wash (Second). British Regional Geology. (London: HMSO for British Geological Survey.) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E089
S013
|
