El Gallo Formation
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| El Gallo Formation | |
|---|---|
| Stratigraphic range: | |
 Afloramiento de la formación El Gallo | |
| 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 |
  El Gallo Formation (Mexico) | |
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]
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] Potential Hypacrosaurus remains have been unearthed here.[7][8]
| Dinosaurs of the El Gallo Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Member | Abundance | Notes | Images |
| 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] | Indeterminate | Possibly represents a new taxon.[4] | ||||
| Maniraptora[11] | Maniraptora indet. | |||||
| Troodontidae[11] | Troodontidae indet. | |||||
| Dromaeosauridae[11] | Dromaeosauridae indet. | |||||
| Theropoda[11] | Theropoda indet. | |||||
Lepidosaurs
The diversity of lipodosaurs in El Gallo fomation is scarce. However, the Polyglyohanodontian Dicothon bajaensis is by far the lizard with an important fossil record for this formation [12][13].
| Lepidosaurs of the El Gallo Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Member | Abundance | Notes | Images |
| Dicothodon | bajaensis | |||||
| Paraglyphanodon[14] | Indeterminate[14] | Probably a juvenile Polyglyphanodon.[5] | ||||
Mammals
| Mammals of the El Gallo Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Cimolodon[15] | C. desosai | |||||
| Mesodma[16] | M. formosa[16] | |||||
| Pediomys[5] | Indeterminate[5] | |||||
| Stygimys[14] | Indeterminate[14] | |||||
Amphibians
An indeterminate albanerpetontid is known from the formation.[17]