Niur Fm
Period:
Silurian, Devonian
Age Interval:
Rhuddanian – Lochkovian, Ir2
Province:
Iran
Lithology and Thickness
Dark brown coral limestone with minor shale intercalations and thick dolomite at the base. Upper limit is light colored quartzite. Some areas are sandier than others, but is characterized by its coral-rich limestones. This formation has many diabase-dykes, olivine-basalt in nature.
Lithology Pattern:
Reef limestone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Mila Gr
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Padeha Fm
Regional extent
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[61.07,35.84],[58.39,36.41],[56.7,36.89],[52.28,35.24],[47.8,37.03],[46.8,36.19],[47.13,34.95],[56.38,28.87],[58.49,28.24],[56.51,34.87],[58.44,35.43],[61,34.96],[61.07,35.84]]]]}}
Fossils
Age
Rhuddanian – Lochkovian
Age Span:
Beginning stage:
Rhuddanian
Fraction up in beginning stage:
0.4
Beginning date (Ma):
442.04
Ending stage:
Lochkovian
Fraction up in the ending stage:
0.5
Ending date (Ma):
415.70
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Middle East Geological Timescale 2008 Al-Husseini, Journal of Middle East Petroleum Geosciences v 13, no. 4