INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
SEM studies of Early Cretaceous species of Classopollis Pflug, 1953 emend. Srivastava 1976 from Patagonia, Argentina
VOLKHEIMER, W; SCAFATI, L; MELENDI, D L; D`ANGELO, JOSÉ A
Congreso; 8th European Palaeobotany - Palynology Conference; 2010
The numerous formspecies of the pollen genus Classopollis, representing the conifer family Cheirolepidiaceae, are the dominant group of palynomorphs present in many palynologic assemblages of Jurassic and Cretaceous age in Patagonia. Earlier studies on Mesozoic assemblages of Classopollis in Argentina were carried out principally in the Neuquén Basin. The present contribution is conducted on several hundreds of specimens obtained from a unique thin stratigraphic level from the Early Cretaceous (Valanginian) of Central Chubut (Patagonia), representing a brief moment in the geologic history and thus being particularly adequate for taxonomic study. A morphologic study of different types of Classopollis based on sculptural characteristics, from the Valanginian of the Cañadón Calcáreo Formation, was performed using scanning electron microscopy. Seven morphotypes could be distinguished and compared with preexisting taxa known from literature.