First Devonian palynological assemblage from the Zenta Range, eastern Cordillera, northwestern Argentina

NOETINGER, S.; DI PASQUO, M. M.

REVISTA BRASILEIRA DE PALEONTOLOGIA

SOC BRASILEIRA PALEONTOLOGIA

Año: 2010 vol. 13 p. 13 - 20

1519-7530

This study presents the first Devonian palynological record in the Zenta Range in Eastern Cordillera, Argentina. Two associations were recognized on the basis of differences in palynomorphs and palynofacies. The palynoassemblage AL1, from the lower part of the outcrop, is characterized by chitinozoans, such as Cingulochitina sp. cf. C. serrata and Hoegisphaera sp. cf. H. glabra, accompanied by a few species of phytoplankton, which suggests the Lochkovian s. l., and palynofacies indicate a marine paleoenvironment. The appearance of Diboliporites farraginis in the palynoassemblage AL2 suggests a Middle Devonian. The concurrence of some fresh or brackish water taxa, sporomorphs and very few acritarchs, denotes littoral conditions in this part of the succession. The transgression for the Early Devonian is recorded in AL1.