Abstract
Abstract. GYMNOSPERM FLORA FROM THE NIRIHUAU FORMATION (LATE OLIGOCENE-EARLY MIOCENE), RIO NEGRO PROVINCE, ARGENTINA. The Cenozoic paleofloras in the area of San Carlos de Bariloche, Argentina are located mainly along the Nirihuau and Pichileufu rivers, and belong to several stratigraphic units. Of these, the flora of Pico Quemado is situated in the most basal part of the Nirihuau Formation and is probably late Oligocene-early Miocene in age. It is described herein, gymnospermous foliar impressions and compressions of Araucaria nathorstii Dusen (section Araucaria) and an ovuliferous scale of Araucariaceae; the latter constitutes the first evidence of reproductive structures belonging to section Araucaria for the Cenozoic of South America. Foliar impressions and compressions of Podocarpaceae are also present. Among them, the presence of podocarps with bilateral leaves related to Dacrycarpus de Laubenfels, previously known from Eocene outcrops of Chile, Argentina and Antarctica, allows extending their recor...
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