CRONOESTRATIGRAFÍA DEL PALEOZOICO SUPERIOR DE AMÉRICA DEL SUR: SEGUNDA ETAPA DE TRABAJO HACIA UNA NUEVA PROPUESTA

AZCUY, C.; BERI ÁNGELES; BERNARDES DE OLIVEIRA MARY E; CARRIZO HUGO A; DI PASQUO MERCEDES; DÍAZ SARAVIA PAMELA; GONZÁLEZ CARLOS R; IANNUZZI ROBERTO; LEMOS VALESCA B; MELO JOSÉ H; PAGANI MARÍA A; ROHN ROSEMARIE; AMENÁBAR CECILIA R; SABATTINI NORA; SOUZA PAULO A; TABOADA ARTURO C; VERGEL MARÍA M

San Miguel de Tucumán

Jornada; 2ª Jornadas Geológicas de la Fundación Miguel Lillo; 2008

Dirección de Geología de la Fundación Miguel Lillo

ABSTRACT: CHRONOSTRATIGRAPHY OF THE UPPER PALEOZOIC OF SOUTH AMERICA: SECOND WORK STEP TOWARD A NEW PROPOSAL. Researches on fossil assemblages from different areas of the South American Gondwana, allow confirm an uncommon paleontological record when compared to those of the northern hemisphere. Nevertheless, the South American chronostratigraphical terminology mostly follows schemes defined in Western Europe, Russia and North America, where most Upper Paleozoic international stratotypes was defined. The aim to establish a regional chronostratigraphic scheme to the Upper Paleozoic of South America was preliminary presented in recent publications by a working group of Latin-American authors (Azcuy et al. 2007a,b). An update paleontological record with discussions of biozonations, lithostratigraphic and biostratigraphic correlations, and recent radiometric data of different South American basins were included in the mentioned contributions. The second step of the working group, focus the following main objectives: a) to review and update litho- and biostratigraphical information from southern South American basins; b) to discuss and compare distinctive paleontological assemblages and its evolution’s rate to be used in intrabasinal and regional correlations; c) to review and analyze diastrophism, paleogeographical and paleoclimatological events in southwestern Gondwana; d) to select potential stratigraphic sections with precise biozonations based in diverse paleontological records, to be recognised as regional stages of southern South America.