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The Mio–Pliocene Pisco Formation, Peru, is a world renowned Konservat-Lagerstätte. Beside\udits potential in preserving important information on the history of the Pacific Ocean during the Miocene, the\udPisco Fm. provides palaeontologists with the unique opportunity to study in detail the evolution of marine\udvertebrate fauna during the Neogene. Because diatomites are one of the main lithologies of the Pisco Fm.,\udprevious authors have hypothesised exceptionally high sedimentation rates related to the deposition of diatom\udfrustules as the main cause leading to the formation of the Lagerstätte. However, sedimentation rates were\udnever calculated. With the perspective to build a solid stratigraphic framework for the whole Pisco Fm., we\udstarted to investigate two important fossiliferous sites: Cerro Colorado and Cerro Los Quesos. Within these\udtwo areas, measurement of multiple stratigraphic sections combined with extensive field mapping of a number\udof distinct marker beds was carried out, which allowed a high-resolution correlation and creation of a\udlocal lithostratigraphic framework. Integrated tephrostratigraphy, 40Ar/39Ar dating and diatom biostratigraphy\udpermitted an accurate chronostratigraphy to be established. Both biostratigraphic and radiometric ages converge\udto indicate a late Miocene age for the two sites, amending previous attribution of Cerro Colorado and\udCerro Los Quesos to the middle Miocene. Age models for the site of Cerro Los Quesos reveal that sedimentation\udrates are high but in line with those of high-productivity environments, thus invalidating the hypothesis\udof exceptional sedimentation rates as the main cause for the formation of the Lagerstätte. These results are\udextremely important also in the perspective of building a complete stratigraphic framework for the Pisco Fm

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Biostratigraphy, geochronology and sedimentation rates of the upper Miocene Pisco Formation at two important marine vertebrate fossil-bearing sites of southern Peru