Fossil oyster shells (Deltoidium or Liostrea delta) from the Upper Jurassic period are commonly found on the seashore at Ringstead Bay in Dorset. Dating from over 135 million years ago, these fossils can easily be seen protruding from the grey sticky clay that forms low crumbling cliffs at the top of the shore. This clay is known as the Ringstead Waxy Clay. Sometimes the oyster shells wash out after heavy rains and winter weather. In the photograph below you can see some fossil oysters end-on in situ, with the edges of the shells visible in the clay as it dries out in the early spring sunshine.
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