El Gallo Formation

The El Gallo Formation is a geological formation in Mexico whose strata date back to the Late Cretaceous, Campanian epoch, specifically dated to 75.21 ± 0.07 Ma and 74.55 ± 0.09 Ma. Dinosaur remains are among the fossils that have been recovered from the formation.
Vertebrate paleofauna.
Dinosaurs.
Indeterminate theropod, coelurosaur, dromaeosaurid, tyrannosaurid, hadrosaurid, and ankylosaurid remains are known from the formation. Dinosaur eggs are known from the formation. "Alexornis antecedens" actually comes from the La Bocana Roja Formation. An indeterminate hadrosaurine is known from the formation.
Amphibians.
An indeterminate albanerpetontid is known from the formation.