Yamama Fm
Period:
Cretaceous
Age Interval:
Berriasian – Valanginian, Sa (1,2), Iq2, Qa1, Bn1
Province:
Saudi Arabia, Iraq, Qatar, Bahrain
Type Locality and Naming
Columns: Saudi Arabia Outcrop, Saudi Arabia Subsurface, Central Iraq, Qatar, Bahrain
Synonym:
Lithology and Thickness
Tan and brown calcarenite (part oolite), alternating with cream to light tan, soft, compact, fine-grained limestone; the base formed mainly of calcarenite commonly includes scattered heads of coral.
Lithology Pattern:
Oolitic limestone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Sulaiy Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Buwaib Fm
Regional extent
GeoJSON
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Fossils
Age
Berriasian – Valanginian
Age Span:
Beginning stage:
Berriasian
Fraction up in beginning stage:
0.8
Beginning date (Ma):
138.78
Ending stage:
Valanginian
Fraction up in the ending stage:
0.35
Ending date (Ma):
135.92
Depositional setting
Depositional pattern:
Additional Information
Compiler:
From Middle East Geological Timescale 2008 Al-Husseini, Journal of Middle East Petroleum Geosciences v 13, no. 4. Steineke et. al., 1958, Page 1308