Pectinids are the most abundant and widely distributed taxa in the Tertiary marine beds of Patagonia. Along with other very common molluscan species, they characterize five assemblages, from oldest to youngest: 1) the Oligocene Panopea sierranaParinomya patagonensis Assemblage; 2) the Late Oligocene–Early Miocene Jorgechlamys centralisReticulochlamys borjasensis Assemblage; 3) the Early Miocene Reticulochlamys zinsmeisteriStruthiolarella patagoniensisPleuromeris cruzensis Assemblage; 4) the Early Miocene Pseudoportlandia glabraAntimelatoma quemadensis Assemblage; and 5) the latest Early Miocene–earliest Middle Miocene Nodipecten sp.–Venericor abasolensisGlycymerita camaronesia Assemblage. A brief analysis of the origin and composition of these Tertiary Patagonian molluscan faunas is provided. Striking compositional changes occurred through time, recorded mainly in the Late Paleocene, Late Eocene, Late Oligocene–Early Miocene, and Late Miocene.

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