El Gallo Formation | |
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Stratigraphic range: Coniacian-Maastrichtian | |
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 |
Approximate paleocoordinates | 35°30′N 85°48′W / 35.5°N 85.8°W |
Region | Baja California |
Country | 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]
Crurotarsans of the El Gallo Formation | ||||||
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Genus | Species | Location | Member | Abundance | Notes | Images |
Brachychampsa | [3] | |||||
Leidyosuchus |
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 | ||||||
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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 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 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] |
An indeterminate albanerpetontid is known from the formation.[11]