The lower Atdabanian Amouslek-Tazzemourt-Tiout
reef barrier.
Archaeocyathid-bioherm facies laterally grading into oolitic limestones.
Relatively diverse archaeocyathid assemblage.
Series of small kalyptrae (Individually up to 10 m) in open shelf shales. Tiout Member of Amouslek Fm.
Includes data from Tazemmourt section 30°23°N/
08°48°W.