Ojinaga Formation Explained

Ojinaga Formation
Type:	Geological formation
Period:	Cretaceous
Age:	Mesozoic
Prilithology:	Limestone
Otherlithology:	Shale, Sandstone
Namedfor:	Ojinaga Municipality
Namedby:	R.H. Burrows^[1]
Region:	South North America
Subunits:	Nogal Formation, Picacho Formation
Underlies:	San Carlos Formation
Overlies:	Aurora Limestone, Buda Formation
Thickness:	148 m. - 1395 m.^[2]
Area:	Mexico

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

See also

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

References

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

Notes and References

1. Burrows, R.H., 1910. Geology of Northern Mexico Geological Society of American Bulletin, 7(1), 85–103. https://doi.org/10.18268/BSGM1910v7n1a12
2. 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.
3. Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
4. Abelaid Loera Flores. Occurrence of a tylosaurine mosasaur (Mosasauridae; Russellosaurina) from the Turonian of Chihuahua State, Mexico. 2013. Boletín de la Sociedad Geológica Mexicana. 65. 1. 99–107. 10.18268/BSGM2013v65n1a8. free.
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.