Amij Fm
Period:
Jurassic
Age Interval:
Toarcian, Iq3
Province:
Iraq
Type Locality and Naming
Column: Rutba Uplift (W Iraq)
Synonym:
Lithology and Thickness
Comprises a lower clastic unit and an upper carbonate unit. The lower clastic unit consists of 20-30m of cross-bedded and cross-laminated (herring-bone), ripple marked (oscillation ripples) fine grained quartzitic sandstone and siltstone with lamination produced by concentration of heavy minerals such as zircon and ilmenite. The upper carbonate unit is composed of white to yellowish clayey dolomite and dolomitic limestone.
Lithology Pattern:
Sandy limestone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Hussainiyat Fm
Upper contact
Regionally, the schematic strat column indicates an unconformity, then overlain by the Muhaiwir Fm
Regional extent
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[39.46,32.74],[39.29,32.46],[39.43,32.14],[39.97,32.04],[40.05,32.1],[40.04,32.34],[39.95,32.64],[39.46,32.74]]]]}}
Fossils
Age
Late Toarcian
Age Span:
Beginning stage:
Toarcian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
179.45
Ending stage:
Toarcian
Fraction up in the ending stage:
0.7
Ending date (Ma):
177.55
Depositional setting
Depositional pattern:
Additional Information
Compiler:
From S. Z. Jassim and J. C. Goff, Geology of Iraq, 2006. pg 105, Fig. 9-1: "Stratigraphic correlation of the Late Permian-Liassic Megasequence (AP6)."