Vittatina palynology 10 Argentina 8 biostratigraphy 8 Lueckisporites 6 Lunatisporites 6 Permian 6 South America 6 Weylandites 6 biozonation 6 Bacteria (microorganisms) 4 Biostratigraphy 4 Carboniferous 4 Coniferophyta 4 Cordaitales 4 Invertebrata 4 La Rioja 4 La Rioja [Argentina] 4 La Veteada Formation 4 Palynology 4 Protohaploxypinus 4 Raistrickia 4 age determination 4 algae 4 chronostratigraphy 4 geochronology 4 geographical distribution 4 pollen 4 spore 4 Archaeosigillaria 2