Two reef cycles: Lower Stromatactis mud mound with stromatoporoids on top 
seperated by Calceola marls from second/third reef cycle with:
Top
coral-stromatopora biostrome	
Stromatoporoid bindstone
Tabulate (platy and stick) and rugose coral framestone
Stromatoporoid bindstone
Base

From Copper:
A spectacular Middle and late Givetian coral- stromatoporoid patch reef belt, paralleling the Precambrian basement some 50-100km to the south, is known to extend for c. 300km in the Tindouf basin of northern Saharawi Arab Democratic Republic (='Spanish Sahara': Hazzard,1961; Dumestre & Illing,1967), These tabular to mounded reefs were up to c. 2km across, and tens of meters thick, capped by a rich shallow water coral and stromatoporoid fauna, in the region from Uein Terguet to Gor Loutad. 
Stromatactis mudmounds with auloporids and thamnoporids, like those of the Kess-Kess of the Tafilalt, are also known at Uein Terguet, where they appear to initiate reef growth in the 'first cycle' (Dumestre & Illing, 1967). 