View source for Ojinaga Formation

{{Infobox rockunit
| name           = Ojinaga Formation
| image          = SGM-M1.jpg
| caption        = Skull of ''[[Tylosaurus|Tylosaurus cf. (kansasensis) nepaeolicus]]'' (SGM-M1) from [[Ojinaga Municipality]], [[Chihuahua (state)|Chihuahua]], [[México]].
| type           = [[Geological formation]]
| period         = Cretaceous
| age            = {{fossil range|Turonian}} [[Mesozoic]]
| prilithology   = [[Limestone]]
| otherlithology = [[Shale]], [[Sandstone]]
| namedfor       = [[Ojinaga Municipality]]
| namedby        = R.H. Burrows<ref>Burrows, R.H., 1910. Geology of Northern Mexico Geological Society of American Bulletin, 7(1), 85–103. https://doi.org/10.18268/BSGM1910v7n1a12</ref>
| region         = South [[North America]]
| country        =
| coordinates    =
| unitof         =
| subunits       = [[Nogal Formation]], [[Picacho Formation]]
| underlies      = [[San Carlos Formation]]
| overlies       = [[Aurora Limestone]], [[Buda Formation]]
| thickness      = 148 m. - 1395 m.<ref>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.</ref>
| extent         =
| area           = {{Flag|USA}}<br />{{flag|Mexico}}
| map            =
| map_caption    =
}}

The '''Ojinaga Formation''' is a [[Mesozoic]] geologic [[Formation (geology)|formation]]. [[Dinosaur]] remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific [[genus]].<ref name="dinosaurdistribution">Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.</ref>

==Vertebrate paleofauna==
* ''[[Tylosaurus|Tylosaurus cf. (kansasensis) nepaeolicus]]''<ref name=Flores>{{cite journal|author=Abelaid Loera Flores|title=Occurrence of a tylosaurine mosasaur (Mosasauridae; Russellosaurina) from the Turonian of Chihuahua State, Mexico|year=2013|journal=Boletín de la Sociedad Geológica Mexicana|volume=65|issue=1|pages=99–107|doi=10.18268/BSGM2013v65n1a8|url=https://boletinsgm.igeolcu.unam.mx/bsgm/vols/epoca04/6501/Loera%20PROOF.pdf|doi-access=free}}</ref>

==Invertebrate paleofauna==
* ''[[Inoceramus|Inoceramus sp.]]''<ref name=Castillo>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.</ref>
* ''[[Globochaete|Globochaete alpina]]''<ref name=Castillo></ref>
* ''[[Favusella|Favusella iltermanne]]''<ref name=Castillo></ref>
* ''[[Hedbergella]] sp.''<ref name=Castillo></ref>
* ''[[Sacoccoma]] sp.''<ref name=Castillo></ref>
* ''[[Rotalipora|Rotalipora sp.]]''<ref name=Castillo></ref>
* ''[[Heterohelix|Heterohelix sp.]]''<ref name=Castillo></ref>
* ''[[Leoblichaella|Leoblichaella cf. bentonensis]]''<ref name=Castillo></ref>
* ''[[Clavihedbergella|Clavihedbergella sp.]]''<ref name=Castillo></ref>
* ''[[Mammites nodosides]]''<ref name=Cabrera>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.</ref>
* ''[[Collignomiceras|Collignomiceras chispaense]]''<ref name=Cabrera></ref>
* ''[[Pryonocycloceras|Pryonocycloceras gabrielensis]]''<ref name=Cabrera></ref>
* ''[[Texanites|Texanites stangeri]]''<ref name=Cabrera></ref>
* ''[[Texanites|Texanites densicostatus]]''<ref name=Cabrera></ref>
* ''[[Submortoniceras|Submortoniceras tequesquitense]]''<ref name=Cabrera></ref>
* ''[[Inoceramus|Inoceramus undulatuplicatus]]''<ref name=Cabrera></ref>
* ''[[Placenticeras|Placenticeras planum]]''<ref name=Westgate>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.</ref>
* ''[[Eutrephoceras|Eutrephoceras dekayi]]''<ref name=Westgate></ref>
* ''[[Eutrephoceras|Eutrephoceras alcesense]]''<ref name=Westgate></ref>
* ''[[Baculites|Baculites sp.]]''<ref name=Westgate></ref>
* ''[[Exogyra|Exogyra poderosa]]''<ref name=Westgate></ref>
* ''[[Exogyra|Exogyra erraticostata]]''<ref name=Westgate></ref>

==See also==
{{Portal|Earth sciences|Paleontology|Dinosaurs||}}
* [[List of dinosaur-bearing rock formations]]
** [[List of stratigraphic units with indeterminate dinosaur fossils]]

==Footnotes==
{{Reflist}}

==References==
* Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp.&nbsp;{{ISBN|0-520-24209-2}}.

== External links ==
{{Commonscat|Ojinaga Formation}}

[[Category:Cretaceous geology of Texas]]

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{{Mexico-geologic-formation-stub}}