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Mammals from the Casa Grande Formation Eocene, Province of Jujuy, Argentina Los mamaiferos de la Formacion Casa Grande Eoceno de la Provincia de Jujuy, Argentina



Mammals from the Casa Grande Formation Eocene, Province of Jujuy, Argentina Los mamaiferos de la Formacion Casa Grande Eoceno de la Provincia de Jujuy, Argentina



Ameghiniana, 323: 301-309



In this paper the fossil mammalian fauna from the paleogene Casa Grande Formation (Jujuy Province, Argentina) is presented. Martinmiguelia fernandezi gen. et sp.nov. (Leontiniidae, Notoungulata) is here described, based on cranial and mandibular remains. Its distinctive characters suggest that it is the most generalized Leontiniid known, adding new evidence on the early history of this group. Also other notoungulate remains pertaining to the family Isotemnidae are described, being represented by isolated upper teeth, and an incomplete lower jaw. Due to the incompleteness of these materials they are refered provisionably as Isotemnidae, indeterminate species A and B. The mammal fauna of the Casa Grande Formation, even fragmentary as it is, contributes to a better understanding of the evolutionary history of the Eogene Ungulate mammals from Northern Argentina. Also a tentative correlation is proposed between the Casa Grande Formation of Jujuy Province and the Geste Formation of Antofagasta de la Sierra at Catamarca Province. The Casa Grande Formation is here referred to the Mustersan Age (Middle Eocene).

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