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Cenozoic
Mesozoic
Late Paleozoic
Early Paleozoic
Neoproterozoic


Information provided by geoscience team at Ahmadu Bello University, Zaria, Nigeria --see About

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In Kraf Formation
Click to display on map of the Ancient World at:
In Kraf Fm base reconstruction

In Kraf Fm


Period: 
Ordovician

Age Interval: 
Tremadocian.


Province: 
Illizi Basin

Type Locality and Naming

Synonym: Unit III-1 in Illizi Basin (Benvegnù, 2020)

References: Benvegnù, 2020


Lithology and Thickness

It is made up of shallow-marine sandstone and maximum flooding shales with dark gray silty sequences containing trace fossils representing a marine transgressive unit (Benvegnù, 2020).


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

It conformably overlies the Hassi Leila Fm.

Upper contact

It is conformably overlain by the Hamra Fm.

Regional extent

Illize Basin of SE Algeria


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[7.82,29],[8.33,29.15],[8.78,29.13],[9.38,28.9],[9.38,28.08],[9.2,27.76],[9.32,27.57],[9.23,27.3],[9.03,27.06],[8.55,26.85],[8.25,27.02],[7.98,27.01],[7.69,26.81],[7.42,26.83],[7.07,27.35],[6.78,27.6],[6.59,27.43],[6.45,27.42],[6.2,27.78],[5.99,28.41],[6.33,28.67],[6.52,28.95],[6.58,28.74],[6.69,28.73],[6.86,28.91],[7.33,29.05],[7.63,29.13],[7.82,29]]]]}}

Fossils

Trace fossils.


Age 


Age Span: 

    Beginning stage: 
Tremadocian

    Fraction up in beginning stage: 
0.00

    Beginning date (Ma): 
486.85

    Ending stage: 
Tremadocian.

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):