Ojinaga Formation

Ojinaga Formation
Stratigraphic range: Turonian PreꞒ Ꞓ O S D C P T J K Pg N ↓ Mesozoic
Skull of Tylosaurus cf. (kansasensis) nepaeolicus (SGM-M1) from Ojinaga Municipality, Chihuahua, México.
Type	Geological formation
Sub-units	Nogal Formation, Picacho Formation
Underlies	San Carlos Formation
Overlies	Aurora Limestone, Buda Formation
Area	USA  Mexico
Thickness	148 m. - 1395 m.[1]
Lithology
Primary	Limestone
Other	Shale, Sandstone
Location
Region	South North America
Type section
Named for	Ojinaga Municipality
Named by	R.H. Burrows[2]

The Ojinaga Formation is a Mesozoic geologic formation. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[3]

Vertebrate paleofauna

• Tylosaurus cf. (kansasensis) nepaeolicus[4]

Invertebrate paleofauna

• Inoceramus sp.[5]
• Globochaete alpina[5]
• Favusella iltermanne[5]
• Hedbergella sp.[5]
• Sacoccoma sp.[5]
• Rotalipora sp.[5]
• Heterohelix sp.[5]
• Leoblichaella cf. bentonensis[5]
• Clavihedbergella sp.[5]
• Mammites nodosides[6]
• Collignomiceras chispaense[6]
• Pryonocycloceras gabrielensis[6]
• Texanites stangeri[6]
• Texanites densicostatus[6]
• Submortoniceras tequesquitense[6]
• Inoceramus undulatuplicatus[6]
• Placenticeras planum[7]
• Eutrephoceras dekayi[7]
• Eutrephoceras alcesense[7]
• Baculites sp.[7]
• Exogyra poderosa[7]
• Exogyra erraticostata[7]

See also

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with indeterminate dinosaur fossils

Footnotes

1. Wolleben, J.A., 1965, Nomenclatura litoestratigráfica de las unidades del Cretácico Superior en el Oeste de Texas y el Noreste de Chihuahua: Boletín del Instituto de Geología, 38(2), 65-74.
2. Burrows, R.H., 1910. Geology of Northern Mexico Geological Society of American Bulletin, 7(1), 85–103. https://doi.org/10.18268/BSGM1910v7n1a12
3. Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
4. Abelaid Loera Flores (2013). "Occurrence of a tylosaurine mosasaur (Mosasauridae; Russellosaurina) from the Turonian of Chihuahua State, Mexico" (PDF). Boletín de la Sociedad Geológica Mexicana. 65 (1): 99–107. doi:10.18268/BSGM2013v65n1a8.
5. Castillo-Madrid, A., 1982, Reconocimiento geológico de una porción de los estados de Chihuahua y Coahuila: México, D.F., Universidad Nacional Autónoma de México, tesis profesional, 160 p.
6. Cabrera, F., Narváez, G., Chávez, J.M., Alcántara, J., Gómez, F., 1984, Exploración carbonífera en la Cuenca de Ojinaga, Chihuahua: Informe inédito 45, 20 p.
7. Westgate, J., Brown, R., Pittman, J., Cope, D., Kalb, J., 2006, First occurrences of Deinosuchus in Mexico, en 66th Annual Meeting Society of Vertebrate Paleontology, Ontario, Canada: Journal of Vertebrate Paleontology, 26(3), p. 138.

References

• Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.

External links