Les milieux urgoniens cantabriques

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Abstract
Rudistid-bearing limestones resembling those characterized by a Urgonian facies which were deposited in lower and middle Cretaceous seas of the Mediterranean region occur in northern Spain, where they are intercalated in a thick sequence of Aptian to Albian formations. In the Cantabrian basin of northern Spain frequent invasions of terrigenous material at irregular intervals interrupted development of the Urgonian reefs.

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