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One of the most favourable periods for the expansion of rudists on the northern rim of the Aquitainebasin took place during the middle and the late Turonian within the Charentes and Périgord areas. This major period of rudist congregation development benefited from highly favourable conditions during the end of the first early Cenomanian - Late Turonian 2nd order sequence or “transgressive-regressive”...
This paper presents the first actual documentation of the Wenlock age of the Sharawra Member(Qalibah Formation) of north-western Saudi Arabia by a direct palynological evidence. The local chitinozoan biozones and three new chitinozoan species, Pseudoclathrochitina sharawraensis sp. nov., Ancyrochitina parafragilis sp. nov. et Anthochitina jawfensis sp. nov. are described herein. Eurypterid remains,...
Dans le Moyen Atlas méridional, au-dessus des Marnes à gypse cénomaniennes, les couches de base des calcaires de la Formation d'Amghourzif sont datées du Cénomanien supérieur non terminal par des foraminifères de la sous-famille des Rhapydionininae. Cet âge est confirmé par la mise en évidence, dans les couches sus-jacentes, d'ammonites de la zone à Vascoceras gr. cauvini et d'une association de foraminifères...
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