PREVOSTI Francisco Juan
congresos y reuniones científicas
EVOLUTIONARY DYNAMICS OF NEOGENE VERTEBRATE ASSEMBLAGES IN SOUTHERN SOUTH AMERICA
FRANCISCO J. PREVOSTI; ROMANO, CRISTO O.; ANALÍA FORASIEPI; PARDIÑAS, ULYSES F. J.
Jornada; XXXIV Jornadas Argentinas de Paleontología de Vertebrados; 2022
The vertebrate fossil record of the Pampean Region of Argentina occupies a major place in South American vertebratepaleontology. The abundance of fossils and paleontological sites has long been the main basis for constructing thechronostratigraphical/geochronological scale for the late NeogeneQuaternary of South America and for understandingmajor patterns of vertebrate evolution, including the Great American Biotic Interchange. However, few independentlyderived dates are available for constraining this record. In this contribution, we present new 40Ar/39Ar dates on escorias(likely the product of meteoric impacts) from Central Argentina and statistically-based biochronological analyses that helpto calibrate late MiocenePliocene Pampean faunal successions. These results give a better calibration of important firstappearances of allochthonous taxa in South America, including one of the oldest records for procyonids (late Miocene),cricetids (late Miocene), and tayassuids (middle Pliocene). These results also constrain, to ca. 3 Ma, the last appearancesof the autochthonous sparassodonts, as well as South American terror birds of large/middle body size. The South Americanfaunal turnover during the late Neogene, including late Pliocene extinctions, is interpreted as a consequence of knock-oneffects from global climatic changes and the initiation of the icehouse climate regime.