Hasawnah Fm
Period:
Ordovician, Cambrian
Age Interval:
Fortunian – Tremadocian, Lb2
Province:
Libya
Lithology and Thickness
Subdivided into three units: a lower layer with a basal conglomerate of quartz pebbles (2m thick) overlain by massive banks of cross-bedded sandstone (fluvial and deltaic), a middle fine-grained siltstone layer (intertidal and subtidal), and an upper unit of massive cross-bedded quartz sanstone (offshore bars).
Lithology Pattern:
Sandstone
Relationships and Distribution
Lower contact
This is the oldest unit in the Fezzan Basin
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Hawaz Fm
Regional extent
GeoJSON
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Fossils
Age
Fortunian – Tremadocian
Age Span:
Beginning stage:
Fortunian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
538.80
Ending stage:
Tremadocian
Fraction up in the ending stage:
1.0
Ending date (Ma):
477.08
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Chart derived from: USGS Correlation Chart and Columnar Section for Rocks in Libya, 1963. Descriptions from: Hallet, Don: Petroleum Geology of Libya, 2002.