Coli Toro Formation
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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. 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 |
|---|---|---|---|---|---|---|
| Hadrosauridae | Indeterminate | Cerro Yeso | Isolated caudal vertebrae | Indeterminated hadrosaurids, probably related to other south american Austrokritosaurians | ||
| Titanosauria | Indeterminate | Cerro Yeso | A tooth (MHJG-NCP, formerly 5/4/7-3) | Indeterminated Titanosaurian sauropod | ||
| Abelisauridae | Indeterminate | Estancia Yuquinche | A tooth (MHJG-NCP 299) | The first theropod from the Coli Toro Formation | ||
| Parankylosauria | 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 ? | Indeterminate | Cerro Yeso | A tooth (MHJG Pa 614 106) | A indeterminated crocodyliform tooth, probably belonging to the Notosuchian family Peirosauridae | ||
| Sulcusuchus | 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 | ||
| 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 |
| Genus | Species | Location | Stratigraphic Position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Metaceratodus? | Indeterminate | Cerro Yeso | Dental plates | A lungfish, if confirmed, also found in the La Colonia Formation | ||
| Osteichthyes | Indeterminate | Cerro Yeso | Vertebrae and ganoid scales |
See also
- Angostura Colorada Formation
- La Colonia Formation
- Los Alamitos Formation
- Allen Formation
- Jaguel Formation
- Chorrillo Formation
- Calafate Formation
- El Molino Formation
- Yacoraite Formation
- Vilquechico Formation
- Serra da Galga Formation
- List of dinosaur-bearing rock formations List of stratigraphic units with indeterminate dinosaur fossils
Bibliography
- Ottone, Eduardo G (2009), (PDF), Revista de la Asociación Geológica Argentina, 65: 373–386
- Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), , Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2
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Further reading
- R. M. Casamiquela. 1964. Sobre un dinosaurio hadrosáurido de la Argentina. Ameghiniana 3(9):285-312
- J. O'Gorman and Z. Gasparini. 2013. Revision of Sulcusuchus erraini (Sauropterygia, Polycotylidae) from the Upper Cretaceous of Patagonia, Argentina. Alcheringa 37(2):163-176