Entrampamientos en la Formacion Lujan (Pleistoceno tardio). Analisis tafonornico de un especimen de Hippidion Owen de la cuenca del rio Salado (provincia de Buenos Aires, Argentina)

摘要

MIRING IN THE LUJAN FORMATION (LATE PLEISTOCENE). TAPHONOMIC ANALYSIS OF A SPECIMEN OF HIPP-DION OWEN FROM THE SALADO RIVER BASIN (BUENOS AIRES PROVINCE, ARGENTINA). The interesting finding ofa Hippidion specimen in sediments referred to the Guerrero Member of the Lujan Formation (latePleistocene) in northeast Buenos Aires Province is reported. Preliminary considerations indicate that thebearing level represents a deposition environment similar to existing poorly-drained flood plains.Analysis of several taphonomic characteristics (e.g. position, degree of articulation, soft tissue molds)allows considering that the specimen was incorporated through swamp-miring that also led to its death.Available palaeoautoecological information for this taxon allows the possibility that the accumulation en-vironment of this specimen was a habitat used regularly by the taxon. Reconstruction of the taphonomicpath of this specimen admits the assumption that at least some parts of the floodplain could have workedas swamp-miring sites. The occurrence of this taphonomic mode in the Salado River Basin is particularlyrelevant because it accounts for the relative abundance of relatively complete and well-articulated skele-tons, and it also evidences possible taphonomic bias related to the frequency of use of this environmentby each taxon.