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
TypeFormation
Sub-unitsLa Negra Member
Lithology
PrimaryLime mudstone
Location
Coordinates20.8°N 99.3°W / 20.8; -99.3
Approximate paleocoordinates18.9°N 64.5°W / 18.9; -64.5
RegionHidalgo
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

See also

References

  1. El Doctor Formation at Fossilworks.org
  2. Feldmann et al., 2007
  3. Fielitz & González Rodríguez, 2010
  4. 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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