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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Scripta Geologica. Special Issue

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Rawson, P. F. (1999). Long-distance correlations in the Valanginian-Hauterivian: Argentina - Western Mediterranean - NW Europe. Scripta Geologica. Special Issue, 3, 151–158.