Oxford Clay is a Jurassic marine sedimentary rock underlying much of South East England, from as far west as Dorset and as far north as Yorkshire. The Oxford Clay is argillaceous (consists of clay) and is of Callovian to lower Oxfordian age.
Oxford Clay appears at the surface around Oxford, Peterborough and Weymouth and is exposed in many quarries around these areas. The top of the Lower Oxford Clay shows a lithological change, where fissile shale changes to grey mudstone. The Middle and Upper Oxford Clays differ slightly, as they are separated by an argillaceous limestone in the South Midlands.
Palaeontology
The Oxford Clay is well know for its rich fossil record of fish and invertebrates. Many of the fossils are well preserved, occasionally some are found exceptionally well preserved. Vertebrates which would have lived in the Oxford Clay Sea include; Ichthyosaurs, Cephalopods such as Belemnites, Gryphaea, Bivalves and a variety of Gastropods.
Uses
Oxford clay has a porous consistency and is soft and is often used in the making of roads. It is also the source of the Fletton stock brick of which much of London is built. For brick making, the Oxford Clay has the advantage of containing carbon which provides part of the fuel required in firing it so reducing the requirement for an external fuel source.
See also
- Clay
- London Clay
- Weald Clay
- Cheltenham Clay
- List of fossil sites (with link directory)
References
- Fossils Of The Oxford Clay - David M.Martill and John D.Hudson
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