Albian dinoflagellate cysts from the Kachaike Formation, Austral Basin, Southwest Argentina

M.V. GULER ; S. ARCHANGELSKY

Revista del Museo Argentino de Ciencias Naturales, n.s.

Museo Argentino de Ciencias Naturales, "Bernardino Rivadavia"

Lugar: Buenos Aires; Año: 2006 vol. 8 p. 179 - 184

1514-5158

The palynological assemblages of the Kachaike Formation at the Bajo Comisión section, Austral Basin, Argentina, are mainly composed by pteridophyte and bryophyte spores, gymnosperm and angiosperm pollen, dinoflagellate cysts and other marine and freshwater algae. This study presents the dinoflagellate cyst assemblages recovered from the lower part of the section.  The biostratigraphic index dinoflagellate cysts taxa suggest an early Albian age for the lower part of the Kachaike Formation and the assemblages are attributed to the Muderongia tetracantha Interval Zone (Helby). The dominance of well preserved pollen and spores together with the presence of dinoflagellate cysts, suggest that the lower levels of the Bajo Comisión section were deposited in marine shallow waters, in agreement with the sedimentary facies.