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Cretaceous unknown


Gen. et sp. indet.

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This is a Late Cretaceous limestone from Poland. It contains a greenish glauconitic blob, on which - in one place - ornamentation is visible in a form of ribs, apparently meeting distally  in pairs to form a V shape. First thoughts: poorly preserved inoceramid or ammonoid, Rhizocorallium-type burrow... Or... is it something more interesting??? Ideas!

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