INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
Tetrapod and invertebrate trace fossils from aeolian deposits of the lower Permian of centralwestern Argentina
KRAPOVICKAS, V.; MARSICANO, C.A.; MANCUSO, A.C.; DE LA FUENTE, M.; OTTONE, E.G.
TAYLOR & FRANCIS
Lugar: Londres; Año: 2015 vol. 27 p. 827 - 827
Abundant tetrapod footprints are described from the Early Permian Yacimiento Los Reyunos Formation including both collected and in situ specimens. The slabs come from several quarries at the Sierra Pintada and Sierra de las Peñas area, south-west of Mendoza, Argentina. The trace fossil assemblage, which constitutes one of the oldest known from Gondwana, comprises excellent-preserved tetrapod tracks (Chelichnus duncani, Chelichnus gigas, and "pear-like" footprints) and invertebrate simple subhorizontal (Palaeophycus tubularis) and vertical (Skolithos isp.) burrows formed in a eolian dune field. The analysis of the tetrapod track producers indicates the presence of at least three different taxa of sprawling to semi-erect therapsids, thus suggesting the presence of members of this clade, or closest relatives, in the Early Permian of southern Gondwana. Moreover, a series of measurements and simple indexes were developed to estimate body proportions and locomotion styles of the putative trackmakers. The new assemblage, analyzed in the context of other known Permian assemblages from Pangea, is one the few known in Gondwana to be present in an eolian environment. The valuation of the assemblage, in the light of eolian ichnofacies (Chelichnus, Octopodichnus and, Entradichnus), shows that it has common elements with the Chelichnus and Entradichnus ichnofacies.