Ora Fm
Period:
Devonian, Carboniferous
Age Interval:
Eifelian – Tournaisian, Iq3, Sa4
Province:
Iraq, Saudi Arabia
Type Locality and Naming
Column: Rutba Uplift (W Iraq), Column: NW Saudi Arabia
Synonym:
Lithology and Thickness
Comprises black micaceous and calcareous shale with olive green silty marl and lenses of detrital limestone. Fine-grained sandstone beds occur intermittently throughout the formation
Lithology Pattern:
Continental marl
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Tawil Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Harur Fm
Regional extent
GeoJSON
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Fossils
Age
Eifelian – Tournaisian
Age Span:
Beginning stage:
Eifelian
Fraction up in beginning stage:
0.7
Beginning date (Ma):
388.00
Ending stage:
Tournaisian
Fraction up in the ending stage:
0.1
Ending date (Ma):
358.04
Depositional setting
Depositional pattern:
Additional Information
Compiler:
From S. Z. Jassim and J. C. Goff, Geology of Iraq, 2006. pg 92, Fig. 8-1: "Stratigraphic correlation of megasequences AP1 to AP5 for Iraq and surrounding countries."