The Coli Toro Formation is a Maastrichtian-Danian geological formation in Argentina. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus. The rocks of the formation were deposited in a marine environment, in opposition to the marginal underliying sedimentary environment.
The formation in later publications has been reassigned as the Coli Toro Member at the basal levels of the Los Alamitos Formation, containing fossil remains of Sulcusuchus erraini. The formation partly overlies the Angostura Colorada Formation.