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Revista de la Asociación Geológica Argentina

Print version ISSN 0004-4822On-line version ISSN 1851-8249


CASADIO, Silvio  and  GRIFFIN, Miguel. Sedimentology and paleontology of amiocene marine succession first noticed by Darwin at Puerto Deseado (PortDesire). Rev. Asoc. Geol. Argent. [online]. 2009, vol.64, n.1, pp.83-89. ISSN 0004-4822.

Rocksexposed just south of Puerto Deseado (Port Desire), Santa Cruz Province, weresurveyed by Darwin during his journey on board HMS Beagle. The fossil molluskscollected there were studied later by Sowerby, who described four species basedon the material from "Port Desire". Sedimentological andstratigraphical observations suggest that the marine rocks cropping out atDarwin's locality should be assigned to the Monte León Formation (earlyMiocene). The rocks were deposited in subtidal environments, most precisely inan offshore environment near fair weather wave base at the bottom to a lowershoreface at the top of the section.

Keywords : Darwin; Early Miocene; Monte León Formation; Sedimentology; Paleontology.

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