Cerro Carnerero Formation
The Cerro Carnerero Formation is a geological formation of the Golfo San Jorge Basin in Chubut Province, Patagonia, Argentina. Description The claystones and tuffs of the approximately thick formation, belonging to the Lonco Trapial Group, were deposited in a fluvial environment. The formation dates back to the Middle Jurassic (Toarcian stage) and has preserved fossils of Cladophlebis oblonga, and Amygdalodon patagonicus. The fossiliferous beds rest on Liassic beds with Harpoceras subplanatum, and below the Middle to Upper Jurassic Porphyritic Series. Called the "Cerro Carnerero" beds, Rauhut, 2008, assigned the Cerro Carnerero to the Toarcian to Bajocian. Lithology The formation comprises sandy tuffs and bluish gray claystones, which form part of a continental sedimentary series mixed with porphyritic conglomerates with partly encrusted round pebbles, and bluish gray clays with sandy intercalations and clays in lesser amounts. Fossil content Vertebrate fauna Arthropods Estheria sp. See also List of dinosaur-bearing rock formations Cañadón Asfalto Formation Posidonia Shale References Bibliography Further reading Geologic formations of Argentina Jurassic System of South America Jurassic Argentina Bajocian Stage Toarcian Stage Shale formations Tuff formations Fluvial deposits Formations Fossiliferous stratigraphic units of South America Paleontology in Argentina Geology of Chubut Province