Cerro Carnerero Formation

Cerro Carnerero Formation
Stratigraphic range: Toarcian-Bajocian ~180–170 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Lonco Trapial Group
Underlies	Cañadón Puelman Formation
Overlies	Los Tobianos Formation
Thickness	440 m (1,440 ft)
Lithology
Primary	Claystone, tuff
Other	Conglomerate
Location
Coordinates	44.0°S 69.5°W / -44.0; -69.5
Approximate paleocoordinates	41.8°S 28.5°W / -41.8; -28.5
Region	Chubut Province
Country	Argentina
Extent	Golfo San Jorge Basin
Type section
Named for	Cerro Carnerero
Named by	Herbst
Year defined	1966
Cerro Carnerero Formation (Argentina)

The Cerro Carnerero Formation is a geological formation of the Golfo San Jorge Basin in Chubut Province, Patagonia, Argentina.[1]

Description

The claystones and tuffs of the approximately 440 metres (1,440 ft) thick formation,[2] belonging to the Lonco Trapial Group,[3] were deposited in a fluvial environment.[4]

The formation dates back to the Middle Jurassic (Toarcian stage) and has preserved fossils of Cladophlebis oblonga,[5] and Amygdalodon patagonicus.[6]

The fossiliferous beds rest on Liassic beds with Harpoceras subplanatum, and below the Middle to Upper Jurassic Porphyritic Series. Called the "Cerro Carnerero" beds, Rauhut, 2008, assigned the Cerro Carnerero to the Toarcian to Bajocian.[7]

Lithology

The formation comprises sandy tuffs and bluish gray claystones, which form part of a continental sedimentary series mixed with porphyritic conglomerates with partly encrusted round pebbles, and bluish gray clays with sandy intercalations and clays in lesser amounts.[7]

Fossil content

Vertebrate fauna

Dinosaurs
Taxa	Presence	Notes	Images
Genus: Amygdalodon A. patagonicus	Chubut Province	"Partial skeleton"[6][8]

Arthropods

• Estheria sp.[7]

See also

• List of dinosaur-bearing rock formations
• Cañadón Asfalto Formation
• Posidonia Shale

References

1. Cañadón Puelman at Fossilworks.org
2. Cortés, 1986, p.50
3. Cortés, 1986, p.49
4. Cortés, 1986, p.53
5. Cortés, 1986, p.52
6. Weishampel et al., 2004, p.542
7. Cañadón Puelman, East Slope, Sierra Pampa de Agnía at Fossilworks.org
8. "Table 13.1," in Weishampel et al., 2004, p.263

Bibliography

• Cortés, José María (1986), Estratigrafía y tectónica de la región central de la Provincia de Chubut, República Argentina (PhD thesis) (PDF), Universidad de Buenos Aires, pp. 1–242, retrieved 2019-02-16
• Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21

Further reading

• Cabrera, Á (1947), "Un saurópodo nuevo del Jurásico de Patagonia", Instituto del Museo de la Universidad Nacional de la Plata, Notas del Mueso de la Plata, Paleontología, 12: 1–17