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Remains of marine reptiles have been found in the Vaca Muerta Formation, at Trincajuera Creek (Neuquén province, Argentina) in uppermost Tithonian levels. A new specimen of the turtle [Neusticemys neuquina (Fernandez & De La Fuente,, 1988)] and a pliosaurid, are described. The Vaca Muerta organic-rich shales and marls represent the basinal sedimentary record of the Tithonian transgression in the...
The new genus Cieneguiticeras, assigned to the family Oppeliidae, is described on the basis of Andean lower-middle Tithonian ammonites from Arroyo Cieneguita, west-central part of the Neuquén-Mendoza Basin, Argentina. The macroconchs are closely homoeomorphic with Neochetoceras Spath and the microconchs have a ‘glochiceratid’-type morphology. The stratigraphic range of Cieneguiticeras nov. gen. includes...
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