Despite the considerable differences in faunas from three widely separated areas in the Early Cretaceous world (Argentina, the Mediterranean area and NW Europe) eight genera are common to all three: Valanginites, Olcostephanus, Karakaschiceras, Neohoploceras, Neocomites, Oosterella, Spitidiscus, and Crioceratites. Across two well-marked intervals (mid Valanginian and mid Hauterivian) the faunas are sufficiently close to allow correlation across the whole area. These represent intervals of global sealevel rise.

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Journal Scripta Geologica. Special Issue
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Rawson, P.F. (1999). [Proceedings of the 4th International Workshop of the Lower Cretaceous Cephalopod Team (IGCP-Project 362) / Peter F. Rawson and Philip J. Hoedemaeker (editors)]: Long-distance correlations in the Valanginian-Hauterivian; Argentina-western Mediterranean-NW Europe. Scripta Geologica. Special Issue, 3(8), 151–158.