[5] The formation belongs to the Agua de la Peña Group of the Ischigualasto-Villa Unión Basin, where it is exposed in the Ischigualasto Provincial Park, a World Heritage Site in Argentina.

[6] The up to 1,000 metres (3,300 ft) thick formation of claystones, mudstones and sandstones was deposited in a deltaic to lacustrine environment during the first post-rift sequence in the basin.

[10][4] Tetrapod footprints are a conspicuous type of ichnofossils (trace fossils) found in the Los Rastros Formation, particularly at the Quebrada de Ischichuca locality near Cerro Bola.

[1][14] Another form of trackway consists of numerous non-overlapping sets of broad rounded depressions on a heavily trampled wackestone surface.

Other invertebrate fossils from the Los Rastros Formation include Lioestheria ("conchostracans" or clam shrimp) and Paleomutella (freshwater mussels).