Echkar Formation
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The Echkar Formation is a geological
formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondar ...
comprising
sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) ...
s and
claystone Mudrocks are a class of fine-grained siliciclastic sedimentary rocks. The varying types of mudrocks include siltstone, claystone, mudstone, slate, and shale. Most of the particles of which the stone is composed are less than and are too sm ...
s in the
Agadez Region Agadez Region is one of the seven regions of Niger. At , it covers more than half of Niger's land area, and is the largest region in the country, as well as the largest African state subdivision. The capital of the department is Agadez. Histo ...
of
Niger ) , official_languages = , languages_type = National languagesAfrica Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...
.


Description

Its strata date back to the Late Albian to
Late Cretaceous The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''creta'', the ...
(
Cenomanian The Cenomanian is, in the ICS' geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the s ...
stages, about 100-95 million years ago). Dinosaur remains are among the fossils that have been recovered from the formation.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. .


Fossil content

In Abangarit-Tamesna
at
Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...
.org


Vertebrates


See also

*
List of dinosaur-bearing rock formations This list of dinosaur-bearing rock formations is a list of geologic formations in which dinosaur fossils have been documented. Containing body fossils * List of stratigraphic units with dinosaur body fossils ** List of stratigraphic units with few ...
*
Lists of fossiliferous stratigraphic units in Africa These lists of fossiliferous stratigraphic units in Africa enumerate the rock layers which preserve the fossilized remains of ancient life in Africa by the modern countries wherein they are found. Geographical atlas C ...
**
List of fossiliferous stratigraphic units in Niger This is a list of fossiliferous stratigraphic units in Niger. __NOTOC__ List of fossiliferous stratigraphic units See also * Lists of fossiliferous stratigraphic units in Africa ** List of fossiliferous stratigraphic units in Mali * Geol ...
*
Geology of Niger The geology of Niger comprises very ancient igneous and metamorphic crystalline basement rocks in the west, more than 2.2 billion years old formed in the late Archean and Proterozoic eons of the Precambrian. The Volta Basin, Air Massif and the Iu ...


References


Bibliography

* {{cite LSA , last=Young , first=Mark T. , last2=Hastings , first2=Alexander K. , last3=Allain , first3=Ronan , last4=Smith , first4=Thomas J. , year=2017 , title=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 , journal=
Zoological Journal of the Linnean Society The ''Zoological Journal of the Linnean Society'' is a monthly peer-reviewed scientific journal covering zoology published by Oxford University Press on behalf of the Linnean Society. The editor-in-chief is Maarten Christenhusz (Linnean Society). ...
, volume=179 , pages=377–403


Further reading

* A. F. d. Lapparent. 1953. Gisements de Dinosauriens dans le "Continental intercalaire" d'In Abangarit (Sahara méridional) inosaur 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 Geologic formations of Niger Lower Cretaceous Series of Africa Upper Cretaceous Series of Africa Cretaceous Niger Albian Stage Cenomanian Stage Sandstone formations Shale formations Fluvial deposits Lacustrine deposits Paleontology in Niger Formations