Echkar Formation

Echkar Formation
Stratigraphic range: Late Albian-Cenomanian
~
TypeGeological formation
Unit ofTegama Group
UnderliesFarak Formation
OverliesElrhaz Formation
Lithology
PrimarySandstone
OtherClaystone
Location
Coordinates17°54′N 5°36′E / 17.9°N 5.6°E / 17.9; 5.6
Approximate paleocoordinates2°48′N 0°24′E / 2.8°N 0.4°E / 2.8; 0.4
RegionAgadez Region
CountryNiger
ExtentIullemmeden Basin
Type section
Named forEchkar, Aderbissinat
Echkar Formation (Niger)

The Echkar Formation is a geological formation comprising sandstones and claystones in the Agadez Region of Niger, central Africa.

Description

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

[2]

Vertebrates

Fish

Fish of the Echkar Formation
Genus Species Material Notes Images
Ceratodus C. sp.
Lepidotes L. sp.
Onchopristis O. numida
Platyspondylus P. foureaui

Dinosaurs

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Ornithischians

Ornithischians of the Echkar Formation
Genus Species Material Notes Images
?Stegosauria indet. No genus given. May not actually belong to Stegosauria.

Sauropods

Sauropods of the Echkar Formation
Genus Species Material Notes Images
Aegyptosaurus A. baharijensis
Rebbachisaurus R. tamesnensis
R. sp.

Theropods

Theropods of the Echkar Formation
Genus Species Material Notes Images
Bahariasaurus B. ingens
Carcharodontosaurus[3] C. iguidensis[4]
Elaphrosaurus E. iguidiensis (=Theropoda indet.) Likely an indeterminate theropod.
Inosaurus I. tedreftensis
Rugops R. primus
Spinosaurus S. sp.[4] Teeth

Reptiles

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
Reptiles of the Echkar Formation
Genus Species Material Notes Images
Araripesuchus A. rattoides
Elosuchus E. sp.
Fortignathus F. felixi
Kaprosuchus K. saharicus
Laganosuchus L. thaumastos
Testudines indet. No genus given.

See also

References

  1. ^ 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.
  2. ^ In Abangarit-Tamesna at Fossilworks.org
  3. ^ 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.
  4. ^ a b 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

  • Young, Mark T.; Hastings, Alexander K.; Allain, Ronan; Smith, Thomas J. (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

  • 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
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