Gnishik Formation
Permian geologic formation in Transcaucasia / From Wikipedia, the free encyclopedia
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The Gnishik Formation is a geologic formation in Armenia, Azerbaijan and Iran. It preserves fossils dated to the Wordian age of the Permian period.[1]
Quick Facts Type, Underlies ...
Gnishik Formation | |
---|---|
Stratigraphic range: Wordian (late Murgabian) ~268–265 Ma | |
Type | Formation |
Underlies | Arpa Formation (Armenia) Khachik Formations (Iran) |
Overlies | Asni Formation (Armenia) Dorud Formation (Iran) |
Thickness | 300 m (980 ft) (Armenia) 670 m (2,200 ft) (Iran) |
Lithology | |
Primary | Limestone |
Other | Shale |
Location | |
Coordinates | 39.0°N 45.0°E / 39.0; 45.0 |
Approximate paleocoordinates | 9.1°S 41.4°E / -9.1; 41.4 |
Region | Transcaucasia |
Country | Armenia Azerbaijan Iran |
Extent | Alborz Mountains |
Type section | |
Named for | Gnishik River |
Named by | Arakelyan |
Year defined | 1964 |
Close
The thin-bedded limestones of the formation reach a thickness of 670 metres (2,200 ft) in the Julfa section of northwestern Iran and 300 metres (980 ft) in the Arpa River valley of Armenia. The sediments were deposited in an open marine setting at the northern edge of the Paleo-Tethys Ocean.
The coral Wentzellophyllum gnishikense was named after the formation.