Análisis Paleoambiental De Las Sedimentitas Del Daniano Del Sector Sur De Los Lagos Musters Y Colhué Huapi (Chubut, Argentina)

MATHEOS SERGIO D.; BREA MARIANA; ZUCOL ALEJANDRO L.; MERCEDES PRÁMPARO; ARI IGLESIAS; FISHER ALEJANDRA

Publicaciones XVI Congreso Geológico Argentino, La Plata

Asociación Geológica Argentina

Año: 2005; p. 83 - 90

The paleoecological and paleoenvironmental conditions which are shown were obtained by means of a multidisciplinary study carried out in the fossiliferous localities of Bosque José Ormaechea and Bosque Víctor Szlápelis from the south region of the Musters and Colhué Huapí lakes (Chubut, Argentina). The integral study of these fossiliferous localities was made on the basis of the presence of algae, briofites and fern spores, grains of pollen, dinocysts, phytoliths, stomatocysts, radiolarians, sponge spicules, central diatoms, foliar compressions and impressions, and permineralized by silicification woods. The integral study of the fossiliferous content along with the sedimentological characteristics in the southern area of the Musters and Colhué Huapi lakes, during the lower Paleocene, suggest that from a paleoenvironmental point of view the Salamanca Formation grades from coastal marine environments to fully restricted ones (lagoons or fresh water swamps). The fossiliferous content allows us to infer that they have developed in a stable environment of moderate-warm and humid weather, with dry summer and rainy spring like periods, where the rainfall does not seem to have acted as a limiting factor for the growth of the tafoflora. The temperature has not probably been lower than the freezing point owning to the absence of rings with cryogenic signs.