Quistes de dinoflagelados del Cretácico Inferior de la Plataforma Continental Argentina: resultados bioestratigráficos

Resumen

Palynological assemblages from offshore Argentinaare especially rich in organic walled dinoflagellate cysts. The assemblages proceed from fifteen sidewall core samples of the GHF2x-1, GIA5x-1, GGH6x-1, GHJ10x-1, GOC5x-1, and GSJ2x-1 wells, drilled on the continental shelf . Twenty nine dinoflagellate cyst species were identified. The most diagnostic and stratigraphically significant species are Muderongia australis Helby emend. Monteil, Muderongia tetracantha (Gocht) Alberti emend. Monteil, Odontochitina operculata (Wetzel) Deflandre & Cookson, Chlamydophorella ambigua (Deflandre) Stover & Helby, Dingodinium cerviculum (Cookson & Eisenack) emend. Khowaja-Ateequzzaman et al., Belodinium dysculum (Cookson & Eisenack) emend. Stover & Helby and Herendeenia postprojecta Stover & Helby, which indicate a late Barremian-early Aptian age. The dinocyst assemblages from the six studied wells have been compared with the Lower Cretaceous Australian assemblages and correlated with the upper part of the Muderongia australis Zone Helby et al. and the lower part of the Odontochitina operculata Zone Helby et al.