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Stratigraphic range: Hauterivian-Barremian, 136–125Ma
|Unit of||Wealden Group|
|Underlies||Atherfield Clay Formation|
|Overlies||Tunbridge Wells Sand Formation|
|Thickness||up to 460 m|
Weald Clay or the Weald Clay Formation is a Lower Cretaceous sedimentary rock underlying areas of South East England. It is part of the Wealden Group of rocks. The clay is named after the Weald, an area of Sussex and Kent. It varies from orange and grey in colour and is used in brickmaking.
The un-weathered form is blue/grey, and the yellow/orange is the weathered form; they have quite different physical properties. Blue looks superficially like a soft slate, is quite dry and hard and will support the weight of buildings quite easily. Because it is quite impermeable, and so dry, it does not get broken by tree roots. It is typically found at 750mm down below a layer of yellow clay. Yellow, found on the surface, absorbs water quite readily so becomes very soft in the winter.
The two different types make quite different bricks.
|Dinosaurs reported from the Weald Clay|
Multiple partial skulls, one of which had an associated postcranial skeleton.
"Vertebrae, partial fore and hindlimbs, osteoderms."
- "Wealden Clay Formation". The BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 14 December 2014.
- "Table 4.1," in Weishampel, et al. (2004). Page 72.
- "Table 17.1," in Weishampel, et al. (2004). Page 367.
- Galton, P.M., 2009, "Notes on Neocomian (Late Cretaceous) ornithopod dinosaurs from England - Hypsilophodon, Valdosaurus, "Camptosaurus", "Iguanodon" - and referred specimens from Romania and elsewhere", Revue de Paléobiologie 28(1): 211-273
- Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.
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