Fossils of the Trigonia clavellata Formation 3 – Fossil seashells, mainly bivalves such as Myophorella clavellata, embedded in strata forming a rock pavement belonging to the Clavellata Formation or Beds, that are part of the Jurassic Period Corallian Formation at Ringstead Bay in Dorset, England.
Jessica's Nature Blog 
Should we find the same fossils in France, by Portal Boulogne?
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I am sorry but I do not know the answer, Diederik.
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