Echkar Formation
| Echkar Formation | |
|---|---|
| Stratigraphic range: Late Albian-Cenomanian ~ | |
| Type | Geological formation |
| Unit of | Tegama Group |
| Underlies | Farak Formation |
| Overlies | Elrhaz Formation |
| Lithology | |
| Primary | Sandstone |
| Other | Claystone |
| Location | |
| Coordinates | 17°54′N 5°36′E / 17.9°N 5.6°E |
| Approximate paleocoordinates | 2°48′N 0°24′E / 2.8°N 0.4°E |
| Region | Agadez Region |
| Country |  Niger |
| Extent | Iullemmeden Basin |
| Type section | |
| Named for | Echkar, Aderbissinat |
  Echkar Formation (Niger) | |
The Echkar Formation is a geological formation comprising sandstones and claystones in the Agadez Region of Niger, central Africa.
Description[edit]
Its strata date back to the Late Albian to Late Cretaceous (Cenomanian stages, about 100-95 million years ago). Dinosaur remains are among the fossils that have been recovered from the formation.[1]
Fossil content[edit]
Vertebrates[edit]
| Archosaurs | ||||
|---|---|---|---|---|
| Genus | Species | Material | Notes | Images |
| Aegyptosaurus | A. baharijensis | 
| ||
| Araripesuchus | A. rattoides |  | ||
| Bahariasaurus | B. ingens | 
| ||
| Carcharodontosaurus[3] | C. iguidensis[4] C. saharicus[2] |
 | ||
| Ceratodus | C. sp. | 
| ||
| Elaphrosaurus | E. iguidiensis (=Theropoda indet.) | Likely an indeterminate theropod. | 
| |
| Elosuchus | E. sp. | 
| ||
| Fortignathus | F. felixi | |||
| Inosaurus | I. tedreftensis | |||
| Kaprosuchus | K. saharicus |  | ||
| Laganosuchus | L. thaumastos |  | ||
| Lepidotes | L. sp. | 
| ||
| Onchopristis | O. numida | 
| ||
| Platyspondylus | P. foureaui | |||
| Rebbachisaurus | R. tamesnensis R. sp.[citation needed] |
| ||
| Rugops | R. primus | .png) | ||
| Spinosaurus | S. aegyptiacus |  | ||
| ?Stegosauria indet. | No genus given. May not actually belong to Stegosauria. | |||
| Testudines indet. | No genus given. | |||
See also[edit]
- List of dinosaur-bearing rock formations
- Lists of fossiliferous stratigraphic units in Africa
- Geology of Niger
References[edit]
- ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Early Cretaceous, Africa)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 571-573. ISBN 0-520-24209-2.
- ^ a b In Abangarit-Tamesna at Fossilworks.org
- ^ Brusatte, S. and Sereno, P.C. (2005). "A new species of Carcharodontosaurus (Dinosauria: Theropoda) from the Cenomanian of Niger and its implications for allosauroid phylogeny." Journal of Vertebrate Paleontology, 25: 40A.
- ^ Brusatte, S.L. and Sereno, P.C. (2007). "A new species of Carcharodontosaurus (dinosauria: theropoda) from the Cenomanian of Niger and a revision of the genus." Journal of Vertebrate Paleontology, 27(4)
Bibliography[edit]
- Young, Mark T.; Alexander K. Hastings; Ronan Allain, and Thomas J. Smith. 2017. Revision of the enigmatic crocodyliform Elosuchus felixi de Lapparent de Broin, 2002 from the Lower–Upper Cretaceous boundary of Niger: potential evidence for an early origin of the clade Dyrosauridae. Zoological Journal of the Linnean Society 179. 377–403. .
Further reading[edit]
- A. F. d. Lapparent. 1953. Gisements de Dinosauriens dans le "Continental intercalaire" d'In Abangarit (Sahara méridional) [Dinosaur localities in the "Continental Intercalaire" of In Abangarit (southern Sahara)]. Comptes Rendus de l'Académie des Sciences à Paris 236:1905-1906
- P. C. Sereno, J. A. Wilson, and J. L. Conrad. 2004. New dinosaurs link southern landmasses in the mid-Cretaceous. Proceedings of the Royal Society of London B 271(1546):1325-1330