El Gallo Formation

El Gallo Formation Stratigraphic range: Late Cretaceous
Type	Geological formation
Location
Region	North America

The El Gallo Formation is a geological formation in Mexico whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.^[1]

Vertebrate paleofauna

Crurotarsans

Crurotarsans of the El Gallo Formation
Genus	Species	Location	Member	Abundance	Notes
Brachychampsa	[2]
Leidyosuchus

Dinosaurs

Dinosaur eggs are known from the formation.^[3] Alexornis antecedens actually comes from the La Bocana Roja Formation.

Dinosaurs of the El Gallo Formation
Genus	Species	Location	Member	Abundance	Notes	Images
Ankylosauridae[4]	Indeterminate[4]
Lambeosaurus[5]	L. laticaudus[5]
Magnapaulia	M. laticaudus
Saurornitholestes[6]	Indeterminate[6]
Troodon[6]	T. formosus[6]

Lepidosaurs

Lepidosaurs of the El Gallo Formation
Genus	Species	Location	Member	Abundance	Notes
Paraglyphanodon[7]	Indeterminate[7]				Probably a juvenile Polyglyphanodon.[3]
Polyglyphanodon[3]	P. bajaensis[3]

Mammals

Mammals of the El Gallo Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes
Mesodma[8]	M. formosa[8]
Pediomys[3]	Indeterminate[3]
Stygimys[7]	Indeterminate[7]

See also

• List of dinosaur-bearing rock formations

Footnotes

1. "El Gallo Formation." Weishampel, et al. (2004). Pg. 587-8.
2. "Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 277
3. "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
4. Listed as "cf. Euoplocephalus sp." in "4.5 Estado de Baja California Norte, Mexico; 1. El Gallo Formation," in Weishampel, et al. (2004). Pages 587-588.
5. "Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 260
6. "4.5 Estado de Baja California Norte, Mexico; 1. El Gallo Formation," in Weishampel, et al. (2004). Pages 587-588.
7. Listed as "cf. Paraglyphanodon" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
8. Listed as "Mesodma cf. M. formosa" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.

References

• Hilton, Richard P. 2003. Dinosaurs and Other Mesozoic Reptiles of California. Berkeley: University of California Press. 318 pp.
• Sullivan, R.M., and Lucas, S.G. 2006. "The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America." New Mexico Museum of Natural History and Science, Bulletin 35:7-29.
• Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.