Abstract
A palynologic study of the Paleocene and Eocene of the Salta Group Basin, NW Argentina, provides climatic information for an area that was, during the Paleogene, located at a geographic latitude similar to the present one (between 23 and 26° S). During the Paleogene the mountain chain of the Andes did not exist. While the Early Paleocene (Danian) is characterized by equivalents of Ulmacean forests (Phyllostylon, an endemic species) that today can be found in warm and humid areas, the overlying Late Paleocene (Selandian) Mealla Formation documents somewhat less humid conditions inferred for the “Franja Gris” (= grey band) of the formation, which represents a calcareous pelite plain with shallow lacustrine to palustrine environments and warm climate. An analyzed section from the Late Paleocene (Thanetian) Maiz Gordo Formation is interpreted as dry conditions and a higher altitude montane plant community. The Eocene Lumbrera Formation is palynologically characterized by temperate humid montane paleocommunities.
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