The El Gallo Formation is a geological formation in Mexico whose strata date back to the Late Cretaceous, from the Santonian to the Maastrichtian.

[1] Dinosaur remains are among the fossils that have been recovered from the formation.

[2] Indeterminate theropod, coelurosaur, dromaeosaurid, tyrannosaurid, hadrosaurid, and ankylosaurid remains are known from the formation.

[5] Alexornis antecedens actually comes from the La Bocana Roja Formation.

An indeterminate hadrosaurine is known from the formation.