Reef growth probably starting in Hettangian

Stylophyllopsis spp. (2 species)
Archaeosmilia subrecta
Coryphyllia subregularis
Thamnasteriamorpha dronovi


Abstract of ref 322:
The Liassic Madreporaria from Morocco, collected in the reef and subreef formations of the High and Middle-Atlas are described in the present Monograph. 40 new species are found among the 69 species described. These species belong to 43 genera already known and to 11 new genera. The 10 genera already present in the Triassic do not persist beyond the Domerian. The twenty-five genera which were previously known in the Dogger, the Malm and even the Cretaceous and which appear in the Middle or in the Upper Liassic are not present earlier than the Pliensbachian. This stratigraphical range allows to distinguish three biozones in the Liassic of Morocco: -The Lower Liassic (Hettangien and Sinemurian stages) is characterized by triassic genera and liassic ones which do not do up the Dogger. In the Middle Liassic (Pliensbachian or Carixian and Domerian) are found both triassic and liassic genera and genera which just appear and which live up to the Dogger, the Malm and even to the Cretaceous. In the Upper Liassic (Toarcian and Aalenian) all the triassic genera are disappeared, the genera are very similar to those of the middle Jurassic but essentially liassic genera are still present in this level. The presence in this fauna of triassic genera created by CUIF and of forms till known from the Bajocian to Senonian allows the author to lay a new taxonomy which assembles the    classification of CUIF (1976) respecting the triassic Scleractinia and the oldest classifications of VAUGHAN & WELLS (1943), WELLS (1956) and Alloiteau (1952 and 1957) till now used for the mesozoic Madreporaria. This new taxonomy is based both on skeleton microstructures (CUIF) and on other anatomic characters which are the evidence of an evolution in the microstructure and in the arrangement of the trabeculae. 