Dukamaje Formation

Geological formation in Niger and Nigeria From Wikipedia, the free encyclopedia

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]

TypeGeological formation
Sub-unitsGypsiferous shale Member
PrimaryMudstone, shale
OtherSiltstone, marl, gypsum
Quick facts Type, Sub-units ...
Dukamaje Formation
Stratigraphic range: Maastrichtian[1]
TypeGeological formation
Sub-unitsGypsiferous shale Member
Lithology
PrimaryMudstone, shale
OtherSiltstone, marl, gypsum
Location
Coordinates15.4°N 5.8°E / 15.4; 5.8
Approximate paleocoordinates5.1°N 0.6°E / 5.1; 0.6
RegionTahoua
Sokoto
CountryNiger, Nigeria
ExtentIullemmeden Basin
Type section
Named forDukamaje, Sokoto, Nigeria
Dukamaje Formation is located in Niger
Dukamaje Formation
Dukamaje Formation (Niger)
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Fossil content

More information Dinosaurs of the Dukamaje Formation, Taxa ...
Dinosaurs of the Dukamaje Formation
Taxa Presence Description Images

Genus:

  1. ?B. ingens.[1]
  1. Geographically present in Département De Tahoua, Niger.[1]
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More information Mosasaurs of the Dukamaje Formation, Taxa ...
Mosasaurs of the Dukamaje Formation
Taxa Presence Description Images
Genus:
  1. I. aegyptiacus[2]
  1. Geographically present on Mt. Igdaman, near the village of Igdaman (or In Daman).[2]
 Mid-sized globidensine mosasaur.[3] Originally described as a plioplatecarpine. Durophagous.[2]
Goronyosaurus and juvenile elasmosaurs
Genus:
  1. G. nigeriensis
  2. G. sp.[2]
  1. Type locality unknown. From the portion of the Dukamaje Formation located in Nigeria.
  2. Geographically present on Mt. Igdaman. From the portion of the Dukamaje Formation located in Niger.[2]
 Large mosasaur of uncertain affiliations. High number of foramina on the snout and small eyes indicate a murky-water hunter.[4]
Genus:
  1. ?A. sp.[2]
  1. Geographically present on Mt. Igdaman.[2]
 Represented here by four vertebrae, one from a juvenile. Fragmentary state makes identification difficult.[2]
Genus:
  1. H. sp.[2]
  1. Geographically present on Mt. Igdaman.[2]
 Mid-sized mosasaur. Represented here by four vertebrae.[2]
Genus:
  1. P. sp.[2]
  1. Geographically present on Mt. Igdaman.[2]
 Mid-sized plioplatecarpine mosasaur. Represented here by several vertebrae.[2]
Genus:
  1. P. sp.[2]
  1. Geographically present on Mt. Igdaman.[2]
 Mid-sized plioplatecarpine mosasaur. Represented here by a single fragmentary vertebrae.[2]
Genus:
  1. cf. M. hoffmannii[2]
  1. Geographically present on Mt. Igdaman.[2]
 Massive mosasaurine mosasaur. Represented here by a fragmentary tooth crown. The first example of Mosasaurus from Niger and Nigeria.[2]
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Other reptiles
Fishes

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References

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