Cerro del Pueblo Formation

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Cerro del Pueblo Formation
Stratigraphic range: Campanian ~73.6–72.7 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Difunta Group
Underlies	Cerro Huerta Formation
Overlies	Parras Shale
Thickness	160 m (520 ft)
Lithology
Primary	Mudstone, sandstone
Other	Siltstone, conglomerate, limestone
Location
Coordinates	26°06′N 101°06′W / 26.1°N 101.1°W / 26.1; -101.1
Approximate paleocoordinates	32°12′N 75°30′W / 32.2°N 75.5°W / 32.2; -75.5
Region	Coahuila
Country	Mexico
Extent	Parras Basin
Cerro del Pueblo Formation (Mexico) Show map of Mexico Cerro del Pueblo Formation (Coahuila) Show map of Coahuila

The Cerro del Pueblo Formation is a geological formation in Coahuila, Mexico, whose strata date back to the latest Campanian of the Late Cretaceous, just before the Campanian-Maastrichtian boundary. Dinosaur remains are among the fossils that have been recovered from the formation.^[1] The formation is believed to correlate with the Baculites reesidesi and Baculites jenseni ammonite zones, which dates it to 73.63-72.74 Ma.^[2]

The Cerro del Pueblo Formation includes marine, brackish, and non-marine environments, and was laid down in a coastal lowland environment, with Coahuila being on the edge of the Western Interior Seaway at the time. Fossils are abundant in the Cerro del Pueblo Formation, and include dinosaurs and other vertebrates, plants and seeds, and invertebrates including oysters, snails, and other molluscs. The formation is underlain by the Parras Shale and is overlain by the Cerro Huerta Formation.