Abstract Nearctic ungulates such as artiodactyls, perissodactyls, and proboscideans arrived in South America during the Great American Biotic Interchange. Among them are camelids, cervids, tayassuids, equids, tapirids gomphotherids. A historical collection of from Pleistocene deposits Pampean region Argentina is here studied described. The consists specimens collected by Santiago Roth nineteent...

Abstract Continental reconstructions became a geological problem after the rise of continental drift. With plate tectonics, it easy to make once ocean-floor magnetic anomaly stripes available. However, for times before medial Jurassic, must depend on palaeomagnetism, palaeoclimatology and palaeobiogeography. All three methods give rough latitudinal control, whereas obtaining longitudinal contro...