Acritarches du Cambrien moyen de la vallée de Tacheddirt (Haut-Atlas, Maroc) dans le cadre d'une nouvelle zonation du Cambrien
Vanguestaine, M.; Van Looy, J. (1983). Acritarches du Cambrien moyen de la vallée de Tacheddirt (Haut-Atlas, Maroc) dans le cadre d'une nouvelle zonation du Cambrien. Ann. Soc. géol. Belg. (1968) 106(1): 69-85
In: Annales de la Société géologique de Belgique. Vaillant-Carmanne: Liège. ISSN 0037-9395, meer
The limestones and siltstones which crop out in the Tacheddirt Valley of the High Atlas Mountains (Morocco), have provided 13 acritarch localities yielding 16 species, including two new ones, viz. Multiplicisphaeridium chakor and Timofeevia tacheddirtensis. Two different associations have been distinguished. The older one is the most diversified and is characterised by the constant presence of Cristallinium cambriense (Slavikova) Vanguestaine, 1978, Eliasum llaniscum Fombella, 1978 and Timofeevia lancarae (Cramer & Diez) Vanguestaine, 1978. The younger one is only composed of sphaeromorphs and Micrhystridium. Trilobite remains reported in the present paper date the older association as the Paradoxides oelandicus "stage" or early Paradoxides paradoxissimus "stage" of the Middle Cambrian. The younger assemblage is also associated locally with Middle Cambrian trilobites.A biostratigraphic zonation for the entire Cambrian shows that 7 acritarch Zones or Superzones may be distinguished. This zonation allows the rocks at Tacheddirt to be assigned biostratigraphically. The chronostratigraphic implications are dealt with in the conclusions.
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