page_title: Oxford Clay
section_title: Saurischians
hierarchical_section_title: Oxford Clay / Palaeontology / Saurischians
caption_attribution_description: English: Life restoration of Cetiosauriscus stewarti, based on historic photographs and drawings of the mounted skeleton.
context_page_description: The Oxford Clay is a Jurassic marine sedimentary rock formation underlying much of southeast England, from as far west as Dorset and as far north as Yorkshire. The Oxford Clay Formation dates to the Jurassic, specifically, the Callovian and Oxfordian ages, and comprises two main facies. The lower facies comprises the Peterborough Member, a fossiliferous organic-rich mudstone. This facies and its rocks are commonly known as lower Oxford Clay. The upper facies comprises the middle Oxford Clay, the Stewartby Member, and the upper Oxford Clay, the Weymouth Member. The upper facies is a fossil poor assemblage of calcareous mudstones.
  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.
  Equivalent Callovo-Oxfordian Clay units like the Marnes de Dives also occur in the Paris Basin and it is a potential host to dispose of high-level radioactive waste in France.
caption: Cetiosauriscus
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