The late Paleozoic El Imperial Formation, western Argentina: Glacial to post-glacial transition and stratigraphic correlations with arc-related basins in southwestern Gondwana

► The middle unit of the El Imperial Formation records Pennsylvanian glaciation. ► Facies are restricted marine, deltaic, glacially-influenced, and post-glacial marine. ► Depositional events correlate with the Río Blanco and Calingasta-Uspallata Basins.