A. Map showing the paleogeographic extensions of the lake during the Oligocene and Miocene (adapted from Hugueney et al., 1999) of the Limagne Basin and localization of the visited sites during the m-fed fieldtrip (satellite images from © Microsoft Corporation – Imagery © Harris Corp, Earthstar Geographics LLC). B. Localization of the Chadrat outcrop. C. Jussat outcrop (ancient quarry). D. Grand Gandaillat quarry. E. Puy de la Poix outcrop. F. Saint Marguerite outcrop with the modern carbonate platform.