Tiourarén Formation
Geological Formation / From Wikipedia, the free encyclopedia
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The Tiourarén Formation is a geological formation in the Agadez Region of Niger whose strata were originally thought to be Early Cretaceous. However, re-interpretation of the sediments showed that they are probably Middle or Late Jurassic (Bathonian-Oxfordian) in age.[1][2] Other works suggested it reaches the Barremian.[3] It is the uppermost unit of the Irhazer Group. Dinosaur remains & other vertebrates are among the fossils that have been recovered from the formation.[4] Originally part of the "Argiles de l'Ihrazer", the Tiouaren Formation primarily comprises reddish to purple siltstones with occasional marls, limestones, and scarce channel sandstones.[1]
Tiourarén Formation | |
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Stratigraphic range: Middle or Late Jurassic 170–145 Ma (Suggested post Bathonian, reaching either Oxfordian or even Barremian) | |
Type | Geological formation |
Unit of | Irhazer Group |
Underlies | Tazolé Formation (Tegama Group) |
Overlies | Irhazer Shale |
Thickness | ~350 m (1,150 ft) |
Lithology | |
Primary | Siltstone, mudstone |
Other | Sandstone, marl, limestone |
Location | |
Coordinates | 16.5°N 7.8°E / 16.5; 7.8 |
Approximate paleocoordinates | 8.2°N 2.5°E / 8.2; 2.5 |
Region | Agadez |
Country | Niger |
Extent | Iullemmeden Basin |
Type section | |
Named for | Tiourarén hill, Agadez |
Named by | Moody R.T.J. & Sutcliffe P.J.C. |