Fossil Rastellum Bivalve. Cretaceous Period, c.120 million years B.P.. A polished fossil Rastellum bivalve. 98 grams, 79 mm (3 1/8 in.) From the Marovoay, Mahajanga district, Madagascar. Private Shropshire, UK, collection. Also known as ‘fossil aliens’, due to their unique shape and resemblance to depictions in films. [No Reserve]

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