Earth:Dukamaje Formation
From HandWiki
| Dukamaje Formation Stratigraphic range: Maastrichtian[1] | |
|---|---|
| Type | Geological formation |
| Sub-units | Gypsiferous shale Member |
| Lithology | |
| Primary | Mudstone, shale |
| Other | Siltstone, marl, gypsum |
| Location | |
| Coordinates | [ ⚑ ] : 15°24′N 5°48′E / 15.4°N 5.8°E |
| Paleocoordinates | [ ⚑ ] 5°06′N 0°36′E / 5.1°N 0.6°E |
| Region | Tahoua Sokoto |
| Country |  Niger Nigeria |
| Extent | Iullemmeden Basin |
| Type section | |
| Named for | Dukamaje, Sokoto, Nigeria |
  Dukamaje Formation (Niger) | |
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]
Fossil content
| Dinosaurs of the Dukamaje Formation | ||||
|---|---|---|---|---|
| Taxa | Presence | Description | Images | |
|
Genus:
|
|
|||
| Mosasaurs of the Dukamaje Formation | |||
|---|---|---|---|
| Taxa | Presence | Description | Images |
Genus:
|
|
Mid-sized globidensine mosasaur.[3] Originally described as a plioplatecarpine. Durophagous.[2] | |
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.[2] | |
Genus:
|
|
Mid-sized mosasaur. Represented here by four vertebrae.[2] | |
Genus:
|
|
Mid-sized plioplatecarpine mosasaur. Represented here by several vertebrae.[2] | |
Genus:
|
|
Mid-sized plioplatecarpine mosasaur. Represented here by a single fragmentary vertebrae.[2] | |
Genus:
|
|
Massive mosasaurine mosasaur. Represented here by a fragmentary tooth crown. The first example of Mosasaurus from Niger and Nigeria.[2] | |
- Other reptiles
- Fishes
- Asteracanthus aegyptiacus[7]
- 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
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, Africa)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 604-605. ISBN:0-520-24209-2.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 2.26 2.27 Lingham-Soliar, Theagarten (1991). "Mosasaurs from the upper Cretaceous of Niger". Palaeontology 34: 653–670.
- ↑ Lindgren, Johan (2005). "Dental and vertebral morphology of the enigmatic mosasaur Dollosaurus (Reptilia, Mosasauridae) from the lower Campanian (Upper Cretaceous) of southern Sweden". Bulletin of the Geological Society of Denmark 52: 17–25. doi:10.37570/bgsd-2005-52-03.
- ↑ "Tongues, venom glands, and the changing face of Goronyosaurus". Tetrapod Zoology. http://scienceblogs.com/tetrapodzoology/2009/04/13/tongues-venom-goronyosaurus/.
- ↑ Gilbedi Hills, Rima River at Fossilworks.org
- ↑ Mont Igdaman (bed 25) at Fossilworks.org
- ↑ In Touhout (bed 4) at Fossilworks.org
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
 |  |
