Shishtu Fm
Period:
Carboniferous, Devonian
Age Interval:
Frasnian – Visean, Ir2
Province:
Iran
Lithology and Thickness
Dark-green shales interbedded with quartzitic sandstone and fossiliferous limestone. Contains "cephalopod beds," which are layers of oolitic limestone and iron-oolite.
Lithology Pattern:
Limestone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Bahram Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Sardar Fm
Regional extent
GeoJSON
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Fossils
Contains "cephalopod beds
Age
Frasnian – Visean
Age Span:
Beginning stage:
Frasnian
Fraction up in beginning stage:
0.7
Beginning date (Ma):
373.44
Ending stage:
Visean
Fraction up in the ending stage:
0.3
Ending date (Ma):
341.81
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Middle East Geological Timescale 2008 Al-Husseini, Journal of Middle East Petroleum Geosciences v 13, no. 4