Ojinaga Formation
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Sub-unitsNogal Formation, Picacho Formation
UnderliesSan Carlos Formation
OverliesAurora Limestone, Buda Formation
| Ojinaga Formation | |
|---|---|
| Stratigraphic range: Mesozoic | |
 Skull of Tylosaurus cf. (kansasensis) nepaeolicus (SGM-M1) from Ojinaga Municipality, Chihuahua, Mexico | |
| Type | Geological formation |
| Sub-units | Nogal Formation, Picacho Formation |
| Underlies | San Carlos Formation |
| Overlies | Aurora Limestone, Buda Formation |
| Thickness | 148–1395 m[1] |
| Lithology | |
| Primary | Limestone |
| Other | Shale, Sandstone |
| Location | |
| Region | South North America |
| Country | United States, Mexico |
| 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]
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]
