Palynology of the San Telmo Formation at the San Antonio range, Salta Province, Argentina

New palynological information recovered from the middle part of the San Telmo Formation, upper part of the Mandiyuti Group, at the San Antonio range, Argentinean portion of the Tarija basin, is presented. Sixty five species of indigenous palynomorphs were identified, together with reworked specimens from the Upper Devonian and also Lower Carboniferous levels. The age of the indigenous assemblage is Late Carboniferous (approximate to Stephanian) and it can be correlated with a similar assemblage, from the outcrop of the Carapari river at the Aguarague range. The age and correlation of the Mandiyuti Group is extensively discussed in order to reject a Early Carboniferous age suggested by some authors.