KOSSMATICERATIDAE (AMMONITINA) Y NOMENCLATURA ESTRATIGRÁFICA DEL CRETÁCICO TARDÍO EN LAGO ARGENTINO, SANTA CRUZ, ARGENTINA

A. C. Riccardi

Abstract


LATE CRETACEOUS KOSSMATICERATIDAE (AMMONITINA) AND STRATIGRAPHIC NOMENCLATURE IN ARGENTINO LAKE, SANTA CRUZ, ARGENTINA.- Outcrops located on the banks of the Calafate creek, southern margin of Argentino lake have yielded: Kossmaticeras (Karapadites) centinelaense Blasco et al., K. (Natalites) cf. hauthali (Paulcke), Neograhamites morenoi sp. nov. These fossils indicate an early (middle) Campanian age for the upper part of the pelitic sequence, i.e. Cerro Toro Formation, immediately below the Maastrichtian (?) Anita Formation. In relation to the already known ammonite faunas from Patagonia, this one is older that those containing Maorites Marshall and Hoplitoplacenticeras Paulcke, and younger than that bearing Anapachydiscus Yabe and Shimizu.

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