El Gallo Formation

{{Infobox rockunit

| name = El Gallo Formation

| image =

| caption =

| type = Geological formation

| age =
{{fossil range|Santonian|Maastrichtian}}

| period = Santonian-Maastrichtian

| prilithology = Mudstone, sandstone

| otherlithology = Siltstone

| namedfor =

| namedby =

| region = {{Flag|Baja California}}

| country = {{MEX}}

| coordinates = {{coord|30.1|N|115.8|W|display=inline,title}}

| paleocoordinates = {{coord|35.5|N|85.8|W|display=inline}}

| unitof =

| subunits = El Disecado Member

| underlies =

| overlies =

| thickness = up to ca. {{convert|1150|m|ft|abbr=on}} (El Disecado Member)

| extent =

| area =

| map = {{Location map+ | Mexico

| relief = 1

| width = 250

| float = center

| places =

{{Location map~ | Mexico

| lat_deg = 30.1

| lon_deg = -115.8

| mark = Lightgreen pog.svg

| marksize = 10

}}

| map_caption =

}}

File:North america 75mya.png

The El Gallo Formation is a geological formation in Mexico whose strata date back to the Late Cretaceous, from the Santonian to the Maastrichtian.{{Cite journal | last1 = Kane | first1 = I. A. | last2 = Hodgson | first2 = D. M. | last3 = Hubbard | first3 = S. M. | last4 = McArthur | first4 = A. D. | last5 = Poyatos-Moré | first5 = M. | last6 = Soutter | first6 = E. L. | last7 = Flint | first7 = S. S. | last8 = Matthews | first8 = W. |url=https://thesedimentaryrecord.scholasticahq.com/article/37652-deep-water-tectono-stratigraphy-at-a-plate-boundary-constrained-by-large-n-detrital-zircon-and-micropaleontological-approaches-peninsular-ranges-fore | title = Deep-water Tectono-Stratigraphy at a Plate Boundary Constrained by Large N-Detrital Zircon and Micropaleontological Approaches: Peninsular Ranges Forearc, Baja California, Mexico | doi = 10.2110/001c.37652 | journal = The Sedimentary Record | volume = 20 | issue = 1 | year = 2022 | s2cid = 59406495 }} 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 =

colspan="7" align="center" \| Crurotarsans of the El Gallo Formation
class="wikitable" align="center"
Genus	Species	Location	Member	Abundance	Notes	Images
Brachychampsa \| "Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 277 \| \| \| \| \|
Leidyosuchus \| \| \| \| \| \|

= Dinosaurs =

Indeterminate theropod, coelurosaur, dromaeosaurid, tyrannosaurid, hadrosaurid, and ankylosaurid remains are known from the formation.{{Cite journal|last1=Ramírez-Velasco|first1=A. A.|last2=Hernández-Rivera|first2=R.|date=2015|title=Diversity of late cretaceous dinosaurs from Mexico|url=http://revistas.igme.es/Boletin/2015/126_1/8-Articulo%204.pdf|journal=Boletín Geológico y Minero|volume=126|issue=1|pages=63–108|access-date=2020-10-02|archive-date=2022-02-25|archive-url=https://web.archive.org/web/20220225104044/https://revistas.igme.es/Boletin/2015/126_1/8-Articulo%204.pdf|url-status=dead}} Dinosaur eggs are known from the formation."El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16. Alexornis antecedens actually comes from the La Bocana Roja Formation. An indeterminate hadrosaurine is known from the formation.{{Cite journal|last1=Cabrera Hernandez|first1=Jonathan S.|last2=Hernandez Rivera|first2=René|last3=Montellano|first3=Marisol|date=2018|title=FOSSIL EGGSHELLS AND TWO PERINATAL DINOSAURS FROM THE EL GALLO FORMATION (LATE CRETACEOUS), EL ROSARIO, BAJA CALIFORNIA, MEXICO|url=http://vertpaleo.org/Annual-Meeting/Annual-Meeting-Home/SVP-2018-program-book-V4-FINAL-with-covers-9-24-18.aspx|journal=Journal of Vertebrate Paleontology, Program and Abstracts|volume=38|access-date=2020-10-14|archive-date=2018-10-22|archive-url=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|url-status=dead}} Potential Hypacrosaurus remains have been unearthed here.{{Cite journal |last=Morris |first=William J. |date=1967 |title=Baja California: Late Cretaceous Dinosaurs |url=https://www.jstor.org/stable/1720983 |journal=Science |volume=155 |issue=3769 |pages=1539–1541 |issn=0036-8075}}{{Cite journal |last=Morris |first=William J. |date=1973 |title=A Review of Pacific Coast Hadrosaurs |url=https://www.jstor.org/stable/1303203 |journal=Journal of Paleontology |volume=47 |issue=3 |pages=551–561 |issn=0022-3360}}

colspan="7" align="center" \| Dinosaurs of the El Gallo Formation
class="wikitable" align="center"
Genus	Species	Location	Member	Abundance	Notes	Images
cf. Chirostenotes \|C. sp. \| \| \| \| \|
Gryposaurus \|Indeterminate \| \| \| \| \|
style="background:#f3e9f3;" \| Lambeosaurus"Appendix: Summary of the Mesozoic Reptilian Fossils of California," in Hilton (2003) p. 260 \| style="background:#fbdddb;" \| L. laticaudus \| style="background:#fbdddb;" \| \| style="background:#fbdddb;" \| \| style="background:#fbdddb;" \| \| style="background:#fbdddb;" \| \|
Magnapaulia \| M. laticaudus \| \| \| \| \|
Saurornitholestinae \|Indeterminate \| \| \| \| \|
cf. Troodon"4.5 Estado de Baja California Norte, Mexico; 1. El Gallo Formation," in Weishampel, et al. (2004). Pages 587-588. \| T. formosus \| \| \| \| \|
Tyrannosauridae \|Indeterminate \| \| \| \|Possibly represents a new taxon. \|

= Lepidosaurs =

colspan="7" align="center" \| Lepidosaurs of the El Gallo Formation
class="wikitable" align="center"
Genus	Species	Location	Member	Abundance	Notes	Images
ParaglyphanodonListed as "cf. Paraglyphanodon" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16. \| Indeterminate \| \| \| \| Probably a juvenile Polyglyphanodon. \|
Polyglyphanodon \| P. bajaensis \| \| \| \| \|

= Mammals =

colspan="7" align="center" \| Mammals of the El Gallo Formation
class="wikitable" align="center"
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
MesodmaListed as "Mesodma cf. M. formosa" in "El Gallo Formation, Baja California Del Norte, Mexico," in Sullivan and Lucas (2006). Page 16. \| M. formosa \| \| \| \| \|
Pediomys \| Indeterminate \| \| \| \| \|
Stygimys \| Indeterminate \| \| \| \| \|

= Amphibians =

An indeterminate albanerpetontid is known from the formation.{{Cite journal|last1=Romo de Vivar Martínez|first1=Paulo R.|last2=Montellano Ballesteros|first2=Marisol|last3=García Alcántara|first3=Dalia|last4=Romo de Vivar Martínez|first4=Paulo R.|last5=Montellano Ballesteros|first5=Marisol|last6=García Alcántara|first6=Dalia|date=December 2016|title=Primer registro de la Familia Albanerpetontidae (Lissamphibia) en la formación El Gallo (Campaniano, Cretácico Superior), Baja California, México|url=http://www.scielo.org.mx/scielo.php?script=sci_abstract&pid=S1405-33222016000300571&lng=es&nrm=iso&tlng=es|journal=Boletín de la Sociedad Geológica Mexicana|language=es|volume=68|issue=3|pages=571–580|doi=10.18268/BSGM2016v68n3a11 |issn=1405-3322}}

References

= Bibliography =

Sullivan, R.M., and Lucas, S.G. 2006. "[https://nmgs.nmt.edu/publications/guidebooks/downloads/54/54_p0369_p0377.pdf 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
{{citation |last1=Weishampel |first1=David B. |author2-link=Peter Dodson |last2=Dodson |first2=Peter |author3-link=Halszka Osmólska |last3=Osmólska |first3=Halszka |year=2004 |title=The Dinosauria, 2nd edition |url=https://books.google.com/books?id=vtZFDb_iw40C |publisher=Berkeley: University of California Press |pages=1–880 |accessdate=2019-02-21 |isbn=0-520-24209-2 |author1-link=David B. Weishampel }}
Hilton, Richard P. 2003. Dinosaurs and Other Mesozoic Reptiles of California. Berkeley: University of California Press. 318 pp.