Kimmeridge Clay | |
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Stratigraphic range: | |
![]() Grey cliffs of Upper Kimmeridge Clay above the beach at Egmont Bight | |
Type | Geological formation |
Unit of | Ancholme Group (onshore), Humber Group (offshore) |
Sub-units | Birch Sandstone Member Burns Sandstone Member Claymore Sandstone Member Dirk Sandstone Member Magnus Sandstone Member Ptarmigan Sandstone Member Ribble Sandstone Member |
Underlies | Portland Sand Formation, Speeton Clay Formation, Spilsby Sandstone |
Overlies | Ampthill Clay, Corallian Group |
Lithology | |
Primary | Mudstone |
Other | Siltstone, Sandstone, Conglomerate |
Location | |
Region | England (surface) North Sea (subsurface) |
Country | United Kingdom |
Type section | |
Named for | Kimmeridge Bay |
Location | Type section - North Sea well 47/15- 1 at 885-919 m depth Type area - coastal outcrops from Black Head, Weymouth to Chapman's Pool |
The Kimmeridge Clay is a sedimentary deposit of fossiliferous marine clay which is of Late Jurassic to lowermost Cretaceous age and occurs in southern and eastern England and in the North Sea.[1] This rock formation is the major source rock for North Sea oil. The fossil fauna of the Kimmeridge Clay includes turtles, crocodiles, sauropods, plesiosaurs, pliosaurs and ichthyosaurs, as well as a number of invertebrate species.
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