The El Gallo Formation is a geological

formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondar ...

in Mexico whose strata date back to the

Late Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the ...

Campanian The Campanian is the fifth of six ages of the Late Cretaceous Epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian s ...

epoch, specifically dated to 75.21 ± 0.07 Ma and 74.55 ± 0.09 Ma.El Gallo Formation
at

Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...

.org Dinosaur remains are among the fossils that have been recovered from the formation."El Gallo Formation." Weishampel et al., 2004, pp.587-588

Vertebrate paleofauna

Crurotarsans

Dinosaurs

Indeterminate theropod, coelurosaur, dromaeosaurid, tyrannosaurid, hadrosaurid, and ankylosaurid remains are known from the formation. Dinosaur eggs are known from the formation."El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16. ''

Alexornis antecedens ''Alexornis'' is a genus of enantiornithine birds from the Bocana Roja Formation of Baja California, Mexico.Tykoski, R. S., & Fiorillo, A. R. (2010). An enantiornithine bird from the lower middle Cenomanian of Texas. ''Journal of Vertebrate Pal ...

'' actually comes from the

La Bocana Roja Formation La Bocana Roja Formation is a geological formation in Baja California, Mexico whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.Weishampel, David B; et al. (2004). "Di ...

. An indeterminate hadrosaurine is known from the formation.

Lepidosaurs

Mammals

Amphibians

An indeterminate

albanerpetontid The Albanerpetontidae are an extinct family of small amphibians, native to the Northern Hemisphere during the Mesozoic and Cenozoic. The only members of the order Allocaudata, they are thought to be allied with living amphibians belonging to Lissa ...

is known from the formation.

References

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 * {{ISBN, 0-520-24209-2 * Hilton, Richard P. 2003. Dinosaurs and Other Mesozoic Reptiles of California. Berkeley: University of California Press. 318 pp.

* M. L. Chavarria-Arellano, T. R. Simões, and M. Montellano-Ballesteros. 2018. New data on the Late Cretaceous lizard Dicothodon bajaensis (Squamata, Borioteiioidea) from Baja California, Mexico reveals an unusual tooth replacement pattern in squamates. Anais da Academia Brasileira de Ciências * O. A. López Conde, J. Sterli, M. L. Chavarría Arellano, D. B. Brinkman, and M. Montellano Ballesteros. 2018. Turtles from the Late Cretaceous (Campanian) of El Gallo Formation, Baja California, Mexico. South American Journal of Earth Sciences 88:693-699 * B. R. Peecook, J. A. Wilson, R. Hernandez-Rivera, M. Montellano-Ballesteros, and G. P. Wilson. 2014. First tyrannosaurid remains from the Upper Cretaceous "El Gallo" Formation of Baja California, Mexico. Acta Palaeontologica Polonica 59(1):71-80 * A. A. Ramírez Velasco, R. Hernández Rivera, and R. Servin Pichardo. 2014. The hadrosaurian record from Mexico. In D. A. Eberth & D. C. Evans (ed.), Hadrosaurs 340-360 * H. E. Rivera Sylva, K. Carpenter, and F. J. Aranda Manteca. 2011. Late Cretaceous nodosaurids (Ankylosauria: Ornithischia) from Mexico. Revista Mexicana de Ciencias Geológicas 28(3):371-378 * W. J. Morris. 1973. Mesozoic and Tertiary vertebrates in Baja California. National Geographic Society Research Reports (1966) 7:197-209 * A. Silva Bárcenas. 1969. Localidades de vertebrados fósiles en la Republica Méxicana ertebrate fossil localities in the Mexican Republic Universidad Nacional Autónoma de México, Instituto de Geología, Paleontología Mexicana 28:1-34 * W. Langston and M. H. Oakes. 1954. Hadrosaurs in Baja California. Bulletin of the Geological Society of America 65(12):1344 Geologic formations of Mexico Upper Cretaceous Series of North America Cretaceous Mexico Campanian Stage Mudstone formations Sandstone formations Fluvial deposits Tidal deposits Ooliferous formations Fossiliferous stratigraphic units of North America Paleontology in Mexico Formations