LOS ARRECIFES DE LA FORMACION COTIDIANO (JURASICO SUPERIOR) EN LA CORDILLERA PATAGONICA y SU SIGNIFICADO PALEOCLIMATICO

Victor Ramos

Abstract


The biohermal limestones of Cotidiano Fm. (Late Jurassic) of the Austral Basin are described. The reefs were found in the Patagonian Cordillera in the province of Chubut. The reef frame is formed by stromatoporaids associated with crinoids, hexacorals and pelecypods, constituting typical stromatoporaid-coral patch-reefs. Palaeoclirnatic evidences from Middle to Late Jurassic rocks as well as the palaeolatitudes obtained fram palaeomagnetic data, show the location of the arid subtropical zone which was extended further south than 40° latitude at that time.

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