Abstract
� � � � � � � p� � � � w� � � � ��� � � An assemblage of dinoflagellate cysts is reported from the Lower Member (Pilmatué Member) of the Agrio Formation (late Valanginian-Hauterivian) of the southern Neuquén Basin, Argentina. Thirty species are recognized and the new w species Oligosphaeridium quattrocchioae and Muderongia sarjeantii described. The studied assemblage is compared w with other Early Cretaceous assemblages from central w western Argentina, Patagonia, the South Atlantic Malvinas Plateau, the Antarctic Peninsula and Australia. The marine dinoflagellate cyst assemblage of the Agrio Formation at the Estancia Santa Elena locality has cosmopolitan character, w with a p predominance of European and Tethyan species.
Highlights
The main objective of this paper is to present and illustrate new data on marine dinoflagellate cyst assemblages of the Lower Member (Pilmatué Member) of the Agrio F o r m a t i o n
The material studied is from outcrop samples of the Lower Member (Pilmatué Member) of the Agrio Formation, of which the lowermost 144m
The Agrio Formation was proposed by Weaver (1931), for the strata deposited on the top of the sandstones of the Early Cretaceous (Valanginian) Mulichinco Formation and beneath the Rayosa Formation
Summary
The main objective of this paper is to present and illustrate new data on marine dinoflagellate cyst assemblages of the Lower Member (Pilmatué Member) of the Agrio F o r m a t i o n. The Agrio Formation was proposed by Weaver (1931), for the strata deposited on the top of the sandstones of the Early Cretaceous (Valanginian) Mulichinco Formation and beneath the Rayosa Formation He divided the Agrio Formation into a lower part composed by “Marine Black Shales”, a middle part of sandstones resistant to erosion (the “Avilé Sandstone”) and an upper part composed of “Marine Black shales”, “Shallow Water Bivalve Beds” and “Gypsum” (Correlation Chart in Weaver, 1931). The latter two units became known as “Huitriniano” (Groeber, 1946) and as the “Huitrín Formation” (Digregorio, 1972).
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