El Doctor Formation
The El Doctor Formation is a geologic formation in Mexico. It preserves fossils dating back to the Albian and Cenomanian stages of the Cretaceous period.[1]
| El Doctor Formation Stratigraphic range: Albian-Cenomanian ~112–95 Ma | |
|---|---|
| Type | Formation |
| Sub-units | La Negra Member |
| Lithology | |
| Primary | Lime mudstone |
| Location | |
| Coordinates | 20.8°N 99.3°W |
| Approximate paleocoordinates | 18.9°N 64.5°W |
| Region | Hidalgo |
| Country |  Mexico |
  El Doctor Formation (Mexico)  El Doctor Formation (Hidalgo) | |
Description
The light grey micritic limestone sequence with intercalated black chert lenses was deposited in an open marine basin with a hypersaline and/or poorly oxygenated bottom.[1]
Fossil content
The formation has provided the following fossils:[1][2]
- Fish
- Crustaceans
- Aeger hidalguensis
- Polzia eldoctorensis[4]
- Victoriacaris muhiensis[4]
- Palinurus sp.
References
- El Doctor Formation at Fossilworks.org
- Feldmann et al., 2007
- Fielitz & González Rodríguez, 2010
- Hegna et al., 2014
Bibliography
- Hegna, T. A.; F. J. Vega, and K. A. González Rodríguez. 2014. First Mesozoic thylacocephalans (Arthropoda, Crustacea; Cretaceous) in the western hemisphere: new discoveries from the Muhi Quarry Lagerstätte. Journal of Paleontology 88. 606–616.
- Fielitz, C., and K. A. González Rodríguez. 2010. A New Species of Enchodus (Aulopiformes: Enchodontidae) from the Cretaceous (Albian to Cenomanian) of Zimapán, Hidalgo, México. Journal of Vertebrate Paleontology 30. 1343–1351.
- Feldmann, R. M.; F. J. Vega; L. Martínez López; K. A. González Rodrigues; O. González León, and M. Rosario Fernández-Barajas. 2007. Crustacea from the Muhi Quarry (Albian-Cenomanian), and a review of Aptian Mecochiridae (Astacidea) From Mexico. Annals of Carnegie Museum 76. 145–156.
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