Tanuma Fm
Period:
Cretaceous
Age Interval:
Coniacian – Santonian, Iq2
Province:
Iraq
Type Locality and Naming
Column: Central Iraq
Synonym:
Lithology and Thickness
Comprises black, fissile (locally pyritic) shale with streaks of grey, macrocrystalline clayey and detrital limestones (sometimes glauconitic), with an oolitic limestone layer at the top. 30m at type section.
Lithology Pattern:
Shallow-marine marl
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Khasib Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Sa'di Fm
Regional extent
GeoJSON
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Fossils
Age
Coniacian – Santonian
Age Span:
Beginning stage:
Coniacian
Fraction up in beginning stage:
0.9
Beginning date (Ma):
86.07
Ending stage:
Santonian
Fraction up in the ending stage:
0.1
Ending date (Ma):
85.50
Depositional setting
Depositional pattern:
Additional Information
Compiler:
From S. Z. Jassim and J. C. Goff, Geology of Iraq, 2006. pg 141, Fig. 12-1: "Stratigraphic correlation of formations of the Late Early Turonian-Danian Megasequence"