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The upper Palaeozoic basins of central-western Argentina include continuous fossiliferous successions spanning the Carboniferous-Permian interval. The palynostratigraphic biozones comprise Late Mississippian, Pennsylvanian and Cisuralian assemblages. Recently, new palynofloras of the La Veteada Formation were referred to the Lopingian (late Permian). However, they are characterized by spores and tetrads of  Lundbladispora  spp. and  Densoisporites  spp., pollen grains of  Lunatisporites pellucidus ,  L. noviaulensis  and  Protohaploxypinus samoilovichii , and the alga  Syndesmorion stellatum , that distinguish the post-Permian recovery floras worldwide. A new uranium-lead chemical abrasion-isotope dilution-thermal ionization mass spectrometry (U-Pb CA-ID-TIMS) age confirms the Olenekian age of this stratigraphic unit and allows the identification of the first Early Triassic palynofloras in this region of western Gondwana. Comparison and correlation with similar assemblages from the southern and northern hemispheres supports the Early Triassic turnover with an increase of lycopsid cavate spores associated with some diagnostic species of taeniate and non-taeniate bisaccate pollen.

palynology

Age constraints of the  Guttulapollenites hannonicus–Cladaitina veteadensis  Biozone in Argentina reveal the first record of Early Triassic (Olenekian) palynofloras in Western Gondwana