| Dukamaje Formation | |
| Type: | Geological formation |
| Age: | Maastrichtian |
| Period: | Maastrichtian |
| Prilithology: | Mudstone, shale |
| Otherlithology: | Siltstone, marl, gypsum |
| Namedfor: | Dukamaje, Sokoto, Nigeria |
| Region: | Tahoua Sokoto |
| Country: |  Niger Nigeria |
| Coordinates: | 15.4°N 5.8°W |
| Paleocoordinates: | 5.1°N 0.6°W |
| Subunits: | Gypsiferous shale Member |
| Extent: | Iullemmeden Basin |
The Dukamaje Formation is a geological formation in Niger and Nigeria whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation.[1] A wealth of Mosasaur fossils have also been recovered from this formation, particularly from the area around Mt. Igdaman.[2]
| Mosasaurs of the Dukamaje Formation | |||
|---|---|---|---|
| Taxa | Presence | Description | Images |
Genus:
|
| Mid-sized globidensine mosasaur.[3] Originally described as a plioplatecarpine. Durophagous. | |
Genus:
|
| Large mosasaur of uncertain affiliations. High number of foramina on the snout and small eyes indicate a murky-water hunter.[4] | |
Genus:
|
| Represented here by four vertebrae, one from a juvenile. Fragmentary state makes identification difficult. | |
Genus:
|
| Mid-sized mosasaur. Represented here by four vertebrae. | |
Genus:
|
| Mid-sized plioplatecarpine mosasaur. Represented here by several vertebrae. | |
Genus:
|
| Mid-sized plioplatecarpine mosasaur. Represented here by a single fragmentary vertebrae. | |
Genus:
|
| Massive mosasaurine mosasaur. Represented here by a fragmentary tooth crown. The first example of Mosasaurus from Niger and Nigeria. | |