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Gryphaea

Gryphaea, also known as Devil's toenails are a type of extinct oyster. They are bivalves fossils from the Jurassic period.

They lived on the sea bed in shallow waters, possibly in large colonies like oysters.

They are common in many parts of Great Britain.

Warwickshire page (http://www2.warwickshire.gov.uk/Web/corporate/pages.nsf/Links/87FA197B61F6D3EF80256B87003A681D)

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