Coli Toro Formation
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.
Fossil content
| Genus | Species | Location | Stratigraphic Position | Material | Notes | Images |
| Peirosauridae ? | Indeterminate | Cerro Yeso | A tooth | A indeterminated crocodyliform tooth, probably belonging to the Notosuchian family Peirosauridae | ||
| Sulcusuchus | S. erraini | Cerro Yeso and near Laguna Cari-Laufquén Grande | Teeth and a fragmentary mandibular ramus | The only named Polycotylid from the Southern Hemisphere, and the most recent one worldwide. Also found in La Colonia Formation | ||
| Testudines | Indeterminate | Cerro Yeso | Turtle plates are reportly commonly found in the Cerro Yeso locality | Perhaps related to the other Pleurodirans from neighbouring Maastrichtian formations |