New palynological records from the glaciomarine deposits of the El Paso Formation (late Serpukhovian-Bashkirian) in Argentine Precordillera: Biostratigraphical implications

VERGEL, M.M.; CISTERNA, G.A.; STERRENS, A.

AMEGHINIANA

ASOCIACION PALEONTOLOGICA ARGENTINA

Lugar: Buenos Aires; Año: 2015 vol. 52 p. 613 - 624

0002-7014

New palynological information from El Paso Formation cropping out at the southern Sierra de Barreal (Calingasta-Uspallata Basin), San Juan province, Argentina is presented. The palynologic assemblages were recovered from the middle to upper part of the section. Abundant trilete (75?90%) and hilate (1?5%) spore species are documented, such as Calamospora hartungiana Schopf in Schopf, Wilson and Bentall, Punctatisporites spp., Grossusporites microgranulatus (Menéndez and Azcuy) Pérez Loinaze and Césari, Cyclogranisporites rinconadensis Césari and Limarino, Apiculatisporis variornatus di Pasquo, Azcuy and Souza, Anapiculatisporites sp. cf. A. conccinus Playford, Lophotriletes intermedius Azcuy, Verrucosisporites chiqueritensis Ottone, V. cortaderensis Perez Loinaze, Raistrickia spp., Tricidarisporites gutii Césari and Limarino, Spinozonotriletes hirsutus Azcuy, Ahrensisporites sp. cf. A. cristatus Playford and Powis, Densosporites sp., Cristatisporites spp., Indotriradites volkheimeri (Azcuy) Perez Loinaze, Vallatisporites ciliaris (Luber) Sullivan, Spelaeotriletes triangulus Neves and Owens and Psomospora detecta Playford and Helby. Also, subordinate pollen grains (1.5?20%): Circumplicatipollis plicatus Ottone and Azcuy, Costatascyclus crenatus Felix and Burbridge emend. Urban, Plicatipollenites sp. cf. P. malabarensis (Potonié and Sah) Foster, Potonieisporites spp., Divarisaccus sp. cf. D. stringoplicatus Ottone. Acritarchs (Baltisphaeridium sp., Cymatiogalea sp., Gorgonisphaeridium spp., Verhyachium sp.) and Zygnematalean algae (Tetraporina sp., Brazilea scisa (Balme and Hennelly) Foster) are present with less of 2.5%.<!--[endif]--> The spores Retusotriletes incohatus Sullivan, Reticulatisporites sp. and Auroraspora sp. and some acritarchs have been considered reworking material. We propose a late Serpukhovian?Bashkirian age, and a correlation with the Subzone A of the Raistrickia densa-Convolutispora muriornata (DM) Biozone to the El Paso assemblages.<!--[if !supportAnnotations]--> <!--[if !supportAnnotations]--><!--[endif]-->