Coli Toro Formation
Geologic formation in Argentina
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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.[1] The rocks of the formation were deposited in a marine environment, in opposition to the marginal underliying sedimentary environment.
| Coli Toro Formation | |
|---|---|
| Stratigraphic range: Maastrichtian-Danian | |
| Type | Formation |
| Overlies | Angostura Colorada Formation |
| Lithology | |
| Primary | Sandstone |
| Location | |
| Coordinates | 41.0°S 69.5°W |
| Approximate paleocoordinates | 43.6°S 55.4°W |
| Region | Río Negro Province |
| Country | Argentina |
| Extent | Neuquén Basin |
  Coli Toro Formation (Argentina) | |
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.[2] The formation partly overlies the Angostura Colorada Formation.[3]
Fossil content
| Genus | Species | Location | Stratigraphic Position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Hadrosauridae[4] | Indeterminate | Cerro Yeso | Isolated caudal vertebrae | Indeterminated hadrosaurids, probably related to other south american Austrokritosaurians | ||
| Titanosauria[4] | Indeterminate | Cerro Yeso | A tooth (MHJG-NCP, formerly 5/4/7-3) | Indeterminated Titanosaurian sauropod | ||
| Abelisauridae[4] | Indeterminate | Estancia Yuquinche | A tooth (MHJG-NCP 299) | The first theropod from the Coli Toro Formation | ||
| Parankylosauria[5] | Indeterminate | Bajo Colorado | Osteoderm associated to a cranial fragment (MJHG 77-33) and a rib piece (MJHG 271B-17) | The osteorderm is similar to the jugal-quadratojugal osteoderm of the La Colonia Parankylosaur, and the rib is T-shaped in cross view, as in other parankylosaurs and euankylosaurs
May also be from the Angostura Colorada Formation |
| Genus | Species | Location | Stratigraphic Position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Peirosauridae ?[4] | Indeterminate | Cerro Yeso | A tooth (MHJG Pa 614 106) | A indeterminated crocodyliform tooth, probably belonging to the Notosuchian family Peirosauridae | ||
| Sulcusuchus[4][6] | S. erraini | Cerro Yeso and near Laguna Cari-Laufquén Grande | Teeth (Cerro Yeso) and a fragmentary mandibular ramus (Laguna Cari-Laufquén Grande) | The only named Polycotylid from the Southern Hemisphere, and the most recent one worldwide. Also found in La Colonia Formation[7] | ||
| Testudines[4] | Indeterminate | Cerro Yeso | Turtle plates are reportly commonly found in the Cerro Yeso locality | Perhaps related to the other Pleurodirans from neighbouring Maastrichtian formations |
| Genus | Species | Location | Stratigraphic Position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Metaceratodus?[4] | Indeterminate | Cerro Yeso | Dental plates | A lungfish, if confirmed, also found in the La Colonia Formation | ||
| Osteichthyes[4] | Indeterminate | Cerro Yeso | Vertebrae and ganoid scales |
