El Gallo Formation Explained

El Gallo Formation
Type:Geological formation
Age:
Period:Santonian-Maastrichtian
Prilithology:Mudstone, sandstone
Otherlithology:Siltstone
Coordinates:30.1°N -115.8°W
Paleocoordinates:35.5°N -85.8°W
Subunits:El Disecado Member
Thickness:up to ca. 1150m (3,770feet) (El Disecado Member)

The El Gallo Formation is a geological formation in Mexico whose strata date back to the Late Cretaceous, from the Santonian to the Maastrichtian.[1] Dinosaur remains are among the fossils that have been recovered from the formation.[2]

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. ChirostenotesC. sp.
GryposaurusIndeterminate
Lambeosaurus[7] L. laticaudus
MagnapauliaM. laticaudus
SaurornitholestinaeIndeterminate
cf. Troodon[8] T. formosus
TyrannosauridaeIndeterminatePossibly represents a new taxon.

Lepidosaurs

Lepidosaurs of the El Gallo Formation
Genus Species Location Member Abundance Notes Images
Paraglyphanodon[9] IndeterminateProbably a juvenile Polyglyphanodon.
PolyglyphanodonP. bajaensis

Mammals

Mammals of the El Gallo Formation
Genus Species Location Stratigraphic position Abundance Notes Images
Mesodma[10] M. formosa
PediomysIndeterminate
StygimysIndeterminate

Amphibians

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

See also

References

Bibliography

Further reading

Notes and References

  1. Kane . I. A. . Hodgson . D. M. . Hubbard . S. M. . McArthur . A. D. . Poyatos-Moré . M. . Soutter . E. L. . Flint . S. S. . Matthews . W. . Deep-water Tectono-Stratigraphy at a Plate Boundary Constrained by Large N-Detrital Zircon and Micropaleontological Approaches: Peninsular Ranges Forearc, Baja California, Mexico . 10.2110/001c.37652 . The Sedimentary Record . 20 . 1 . 2022 . 59406495 .
  2. "El Gallo Formation." Weishampel et al., 2004, pp.587-588
  3. "Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 277
  4. Ramírez-Velasco. A. A.. Hernández-Rivera. R.. 2015. Diversity of late cretaceous dinosaurs from Mexico. Boletín Geológico y Minero. 126. 1. 63–108. 2020-10-02. 2022-02-25. https://web.archive.org/web/20220225104044/https://revistas.igme.es/Boletin/2015/126_1/8-Articulo%204.pdf. dead.
  5. "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
  6. 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. 2020-10-14. 2018-10-22. https://web.archive.org/web/20181022033509/http://vertpaleo.org/Annual-Meeting/Annual-Meeting-Home/SVP-2018-program-book-V4-FINAL-with-covers-9-24-18.aspx. dead.
  7. "Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 260
  8. "4.5 Estado de Baja California Norte, Mexico; 1. El Gallo Formation," in Weishampel, et al. (2004). Pages 587-588.
  9. Listed as "cf. Paraglyphanodon" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
  10. Listed as "Mesodma cf. M. formosa" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
  11. 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. es. 68. 3. 571–580. 10.18268/BSGM2016v68n3a11 . 1405-3322.