In the Sudislavsky district of Kostroma Region, scientists have discovered marine fauna fossils of the Cretaceous period of the Mesozoic era, dating back about 80 million years BCE. Among them are ammonite molluscs (genus Polyptychites), bivalve molluscs, brachiopods, belemnites and the bones of marine vertebrates. All the molluscs have been sent for detailed studies, after which they will find a place in Kostroma’s museums.



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