New record of Pampahippus secundus (Mammalia, Notoungulata) from the Upper Lumbrera Formation, Eocene of northwestern Argentina

GARCÍA-LÓPEZ, DANIEL A.; DERACO, VIRGINIA; ROUGIER, GUILLERMO W.; DEL PAPA, CECILIA; BABOT, JUDITH; BERTELLI, SARA; HERRERA, CLAUDIA M.; GIANNINI, NORBERTO P.

JOURNAL OF VERTEBRATE PALEONTOLOGY

SOC VERTEBRATE PALEONTOLOGY

Año: 2019 vol. 39

0272-4634

The Paleogene record of notoungulates in northwestern Argentina (NWA) is relatively abundant, including 20 species distributed in 16 genera (Powell et al., 2011; Babot et al., 2017). Fourteen of those 16 genera are recorded only in NWA (Powell et al., 2011; Woodburne et al., 2014b), the exceptions being Colbertia, also present in Itaboraí, Brazil, and Pseudhyrax, a typotherianfound in the Argentinean Patagonia and central Chile (Paula Couto, 1952; Croft et al., 2003; Bergqvist et al., 2007). This fauna is not only restricted geographically but also temporally, given that only a few of these taxa have been recorded in more than one of the stratigraphic units cropping out in NWA (viz., Jujuy, Salta, Tucumán, and Catamarca provinces). Thus, most records correspond to single occurrences for each unit, preventing stratigraphic correlations, general comparisons for some fossil-bearing units, and the discovery of biogeographic patterns.