Lake Pebas : a palaeoecological reconstruction of a Miocene , long-lived lake complex in western Amazonia

In 1869, the American palaeontologist W.M. Gabb reported on a remarkable fossil molluscan fauna from Pebas in Peruvian Amazonia. All but one of the species described by Gabb were new, and the assemblage bore but little resemblance to any modem South American fauna. Almost all species were extinct, but the exquisite preservation of the fauna led Gabb to believe that the fossils were ofrelatively recent age. Gabb described several taxa whose relatives at present occur in settings with fluctuating salinities, others that are marine, and still others with a freshwater affinity. The question arose in what kind of environment the Pebas molluscs had lived, and given the inferred presence of marine taxa (the gastropod genera Turbonilla and Mesalia and the bivalve Corbula),

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