Argentina South America Western Hemisphere 196 World 196 Buenos Aires [Argentina] 189 article 152 Patagonia 127 Animals 106 taxonomy 103 Neuquen Basin 95 Mendoza 94 Cretaceous 89 morphology 83 Andes 82 nonhuman 69 Jurassic 64 Sierras Pampeanas 60 abundance 60 paleoenvironment 60 Brazil 58 Rodentia 58 Aves 56 rodent 56 paleomagnetism 54 Atlantic Ocean 53 animal 53 new record 51 Bivalvia 50 geographical distribution 50 tectonic setting 49