Argentina 16 Palaeophycus trace fossil 14 ichnology 12 Cruziana 8 Lockeia 8 Neuquen Basin 8 South America 8 Thalassinoides 8 trackway 8 Arthropoda 6 Bivalvia 6 Diplocraterion 6 Ichnology 6 Skolithos 6 Vertebrata 6 paleogeography 6 sandstone 6 Asteriacites 4 Bergaueria 4 Carboniferous 4 Cretaceous 4 Diplichnites 4 Gondwana 4 Helminthopsis (trace fossil) 4 Ichnofacies 4 Jurassic 4 Marine 4 Neuquén 4 Palaeophycus tubularis 4