El Gallo Formation

El Gallo Formation
Stratigraphic range: Coniacian-Maastrichtian 86.8–71.9 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Sub-units	El Disecado Member
Thickness	up to ca. 1,150 m (3,770 ft) (El Disecado Member)
Lithology
Primary	Mudstone, sandstone
Other	Siltstone
Location
Coordinates	30°06′N 115°48′W / 30.1°N 115.8°W / 30.1; -115.8
Approximate paleocoordinates	35°30′N 85°48′W / 35.5°N 85.8°W / 35.5; -85.8
Region	Baja California
Country	Mexico
El Gallo Formation (Mexico)

The El Gallo Formation is a geological formation in Mexico whose strata date back to the Late Cretaceous, Coniacian to Maastrichtian epoch, specifically dated to 86.8 ± 1.8 Ma and 71.9 ± 1.7 Ma.^[1] Dinosaur remains are among the fossils that have been recovered from the formation.^[2]

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Vertebrate paleofauna

Crurotarsans

Crurotarsans of the El Gallo Formation
Genus	Species	Location	Member	Abundance	Notes	Images
Brachychampsa	^[3]
Leidyosuchus

Dinosaurs

Indeterminate theropod, coelurosaur, dromaeosaurid, tyrannosaurid, hadrosaurid, and ankylosaurid remains are known from the formation.^[4] Dinosaur eggs are known from the formation.^[5] Alexornis antecedens actually comes from the La Bocana Roja Formation. An indeterminate hadrosaurine is known from the formation.^[6]

Dinosaurs of the El Gallo Formation
Genus	Species	Location	Member	Abundance	Notes	Images
cf. Chirostenotes^[4]	C. sp.
Gryposaurus^[6]	Indeterminate
Lambeosaurus^[7]	L. laticaudus^[7]
Magnapaulia	M. laticaudus
Saurornitholestinae^[4]	Indeterminate
cf. Troodon^[8]	T. formosus^[8]
Tyrannosauridae^[4]	Indeterminate				Possibly represents a new taxon.^[4]

Lepidosaurs

Lepidosaurs of the El Gallo Formation
Genus	Species	Location	Member	Abundance	Notes	Images
Paraglyphanodon^[9]	Indeterminate^[9]				Probably a juvenile Polyglyphanodon.^[5]
Polyglyphanodon^[5]	P. bajaensis^[5]

Mammals

Mammals of the El Gallo Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Mesodma^[10]	M. formosa^[10]
Pediomys^[5]	Indeterminate^[5]
Stygimys^[9]	Indeterminate^[9]

Amphibians

An indeterminate albanerpetontid is known from the formation.^[11]

References

^ Kane, I. A.; Hodgson, D. M.; Hubbard, S. M.; McArthur, A. D.; Poyatos-Moré, M.; Soutter, E. L.; Flint, S. S.; Matthews, W. (2022). "Deep-water Tectono-Stratigraphy at a Plate Boundary Constrained by Large N-Detrital Zircon and Micropaleontological Approaches: Peninsular Ranges Forearc, Baja California, Mexico". The Sedimentary Record. 20 (1). doi:10.2110/001c.37652. S2CID 59406495.
^ "El Gallo Formation." Weishampel et al., 2004, pp.587-588
^ "Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 277
^ ^a ^b ^c ^d ^e Ramírez-Velasco, A. A.; Hernández-Rivera, R. (2015). "Diversity of late cretaceous dinosaurs from Mexico" (PDF). Boletín Geológico y Minero. 126 (1): 63–108. Archived from the original (PDF) on 2022-02-25. Retrieved 2020-10-02.
^ ^a ^b ^c ^d ^e ^f "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
^ ^a ^b Cabrera Hernandez, Jonathan S.; Hernandez Rivera, René; Montellano, Marisol (2018). "FOSSIL EGGSHELLS AND TWO PERINATAL DINOSAURS FROM THE EL GALLO FORMATION (LATE CRETACEOUS), EL ROSARIO, BAJA CALIFORNIA, MEXICO". Journal of Vertebrate Paleontology, Program and Abstracts. 38. Archived from the original on 2018-10-22. Retrieved 2020-10-14.
^ ^a ^b "Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 260
^ ^a ^b "4.5 Estado de Baja California Norte, Mexico; 1. El Gallo Formation," in Weishampel, et al. (2004). Pages 587-588.
^ ^a ^b ^c ^d Listed as "cf. Paraglyphanodon" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
^ ^a ^b Listed as "Mesodma cf. M. formosa" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
^ Romo de Vivar Martínez, Paulo R.; Montellano Ballesteros, Marisol; García Alcántara, Dalia; Romo de Vivar Martínez, Paulo R.; Montellano Ballesteros, Marisol; García Alcántara, Dalia (December 2016). "Primer registro de la Familia Albanerpetontidae (Lissamphibia) en la formación El Gallo (Campaniano, Cretácico Superior), Baja California, México". Boletín de la Sociedad Geológica Mexicana (in Spanish). 68 (3): 571–580. ISSN 1405-3322.

Bibliography

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.; Peter Dodson, and Halszka Osmólska (eds.). 2004. The Dinosauria, 2nd edition, 1–880. Berkeley: University of California Press. Accessed 2019-02-21. ISBN 0-520-24209-2
Hilton, Richard P. 2003. Dinosaurs and Other Mesozoic Reptiles of California. Berkeley: University of California Press. 318 pp.

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