Naokelekan Fm
Period:
Jurassic
Age Interval:
Toarcian – Kimmeridgian, Iq4
Province:
Iraq
Type Locality and Naming
Column: N Iraq
Synonym:
Lithology and Thickness
Comprises three units: 1) a lower unit of laminated clayey bituminous limestone alternating with a bituminous shale and fine-grained limestone, 2) a middle unit consisting of thin-bedded fossiliferous, dolomitic limestone referred to as "Mottled Beds" and 3) an upper unit (mostly obscured at type section), of thin-bedded, highly bituminous dolomite and limestone with beds of black shale ("coal horizons") in the lower part.
Lithology Pattern:
Dolomitic limestone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Sargelu Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Basarin Fm
Regional extent
GeoJSON
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Fossils
Age
Toarcian – Kimmeridgian
Age Span:
Beginning stage:
Toarcian
Fraction up in beginning stage:
0.9
Beginning date (Ma):
175.65
Ending stage:
Kimmeridgian
Fraction up in the ending stage:
0.5
Ending date (Ma):
152.01
Depositional setting
Depositional pattern:
Additional Information
Compiler:
From S. Z. Jassim and J. C. Goff, Geology of Iraq, 2006. pg 117, Fig. 10-1: "Stratigraphic correlation of Megasequence AP7."