Jurassic floras of Argentina

QUATTROCCHIO, MIRTA E.; MARTÍNEZ, MARCELO A.; VOLKHEIMER, W.

Corrientes

Otro; Reunión Anual de Comunicaciones de la APA 50º Aniversario de Ameghiniana; 2007

UNNE

The objective is to present the integrated information about palynomorphs and megafloras of the Neuquén Basin (Argentina) and to review data about Jurassic megafloras of Patagonia. The composition of Jurassic palynofloras of the Neuquén Basin is summarized, the most characteristic terrestrial and aquatic morphospecies are illustrated and the palynozones established are represented on a table. From the Middle Callovian through the Late Jurassic the stratigraphic resolution of the dinoflagellate cysts is comparable to the detailed biostratigraphy based on ammonite faunas. The paleogeographic significance and the supraregional relations of the assemblages of dinoflagellate cysts are explained. The paleoenvironmental and paleoclimatic significance of the marine and continental palynobiota are considered and a model is presented which explains the relations between climate, relief and vegetation in the Middle Jurassic of the Neuquén Basin.