Dukamaje Formation
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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. A wealth of Mosasaur fossils have also been recovered from this formation, particularly from the area around Mt. Igdaman.
Fossil content
| Dinosaurs of the Dukamaje Formation | |||
|---|---|---|---|
| Taxa | Presence | Description | Images |
| Genus: ?Bahariasaurus ?B. ingens. | Geographically present in Département De Tahoua, Niger. |
| Mosasaurs of the Dukamaje Formation | |||
|---|---|---|---|
| Taxa | Presence | Description | Images |
| Genus: Igdamanosaurus I. aegyptiacus | Geographically present on Mt. Igdaman, near the village of Igdaman (or In Daman). | Mid-sized globidensine mosasaur. Originally described as a plioplatecarpine. Durophagous. | Goronyosaurus and juvenile elasmosaurs |
| Genus: Goronyosaurus G. nigeriensis G. sp. | Type locality unknown. From the portion of the Dukamaje Formation located in Nigeria. Geographically present on Mt. Igdaman. From the portion of the Dukamaje Formation located in Niger. | Large mosasaur of uncertain affiliations. High number of foramina on the snout and small eyes indicate a murky-water hunter. | |
| Genus: ?Angolasaurus ?A. sp. | Geographically present on Mt. Igdaman. | Represented here by four vertebrae, one from a juvenile. Fragmentary state makes identification difficult. | |
| Genus: Halisaurus H. sp. | Geographically present on Mt. Igdaman. | Mid-sized mosasaur. Represented here by four vertebrae. | |
| Genus: Plioplatecarpus P. sp. | Geographically present on Mt. Igdaman. | Mid-sized plioplatecarpine mosasaur. Represented here by several vertebrae. | |
| Genus: Platecarpus P. sp. | Geographically present on Mt. Igdaman. | Mid-sized plioplatecarpine mosasaur. Represented here by a single fragmentary vertebrae. | |
| Genus: Mosasaurus cf. M. hoffmannii | Geographically present on Mt. Igdaman. | Massive mosasaurine mosasaur. Represented here by a fragmentary tooth crown. The first example of Mosasaurus from Niger and Nigeria. |
Other reptiles
Fishes
- Asteracanthus aegyptiacus
- Igdabatis sigmodon
- Lamna nigeriana
- Schizorhiza stromeri
- Stephanodus lybicus
- Stratodus apicalis
- Ischyrhiza nigeriensis
- Ceratodus sp.
- Ginglymostoma sp.
- Pycnodus sp.
See also
- List of dinosaur-bearing rock formations
- Lists of fossiliferous stratigraphic units in Africa List of fossiliferous stratigraphic units in Niger
- Geology of Niger
- Geology of Nigeria
Further reading
- R. T. J. Moody and P. J. C. Suttcliffe. 1991. The Cretaceous deposits of the Iullemmeden Basin of Niger, central West Africa. Cretaceous Research 12:137-157