El Gallo Formation

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El Gallo Formation
Stratigraphic range:
Santonian–Maastrichtian
Type Geological formation
Sub-unitsEl Disecado Member
Thicknessup to ca. 1,150 m (3,770 ft) (El Disecado Member)
Lithology
Primary Mudstone, sandstone
Other Siltstone
Location
Coordinates 30°06′N115°48′W / 30.1°N 115.8°W / 30.1; -115.8
Approximate paleocoordinates 35°30′N85°48′W / 35.5°N 85.8°W / 35.5; -85.8
Region Baja California
Country Mexico
Mexico topographic map-blank 2.svg
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El Gallo Formation (Mexico)
Paleogeography of the Campanian, showcasing what North America was like during the time range the formation spans North america 75mya.png
Paleogeography of the Campanian, showcasing what North America was like during the time range the formation spans

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]

Contents

Vertebrate paleofauna

Crurotarsans

Crurotarsans of the El Gallo Formation
GenusSpeciesLocationMemberAbundanceNotesImages
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] Potential Hypacrosaurus remains have been unearthed here. [7] [8]

Dinosaurs of the El Gallo Formation
GenusSpeciesLocationMemberAbundanceNotesImages
cf. Chirostenotes [4] C. sp.
Gryposaurus [6] Indeterminate
Lambeosaurus [9] L. laticaudus [9]
Magnapaulia M. laticaudus
Saurornitholestinae [4] Indeterminate
cf. Troodon [10] T. formosus [10]
Tyrannosauridae [4] IndeterminatePossibly represents a new taxon. [4]

Lepidosaurs

Lepidosaurs of the El Gallo Formation
GenusSpeciesLocationMemberAbundanceNotesImages
Paraglyphanodon [11] Indeterminate [11] Probably a juvenile Polyglyphanodon . [5]
Polyglyphanodon [5] P. bajaensis [5]

Mammals

Mammals of the El Gallo Formation
GenusSpeciesLocationStratigraphic positionAbundanceNotesImages
Mesodma [12] M. formosa [12]
Pediomys [5] Indeterminate [5]
Stygimys [11] Indeterminate [11]

Amphibians

An indeterminate albanerpetontid is known from the formation. [13]

See also

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. (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.
  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. 1 2 3 4 5 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.
  5. 1 2 3 4 5 6 "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
  6. 1 2 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.
  7. Morris, William J. (1967). "Baja California: Late Cretaceous Dinosaurs". Science. 155 (3769): 1539–1541. ISSN   0036-8075.
  8. Morris, William J. (1973). "A Review of Pacific Coast Hadrosaurs". Journal of Paleontology. 47 (3): 551–561. ISSN   0022-3360.
  9. 1 2 "Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 260
  10. 1 2 "4.5 Estado de Baja California Norte, Mexico; 1. El Gallo Formation," in Weishampel, et al. (2004). Pages 587-588.
  11. 1 2 3 4 Listed as "cf. Paraglyphanodon" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
  12. 1 2 Listed as "Mesodma cf. M. formosa" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16.
  13. 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. doi: 10.18268/BSGM2016v68n3a11 . ISSN   1405-3322.

Bibliography

Further reading