Abundant Trypanites isp. associated with Gastrochaenolites isp. and Petroxestes pera are evidenced in the first found hardground of the late Albian marine transgressive series, overlying the Continental Intercalaire in the Ouled Nail Range, eastern Saharan Atlas. This hardground is encrusted by oyster shells belonging to Ostrea falco Coquand. The studied hardground developed in warm environment and displays a lateral extension of at least 6 km. It is interpreted as an erosional transgressive surface. The ichnogenus Petroxestes is reported for the first time from Africa. This ichnoassemblage is attributed to the Trypanites ichnofacies.

丰富的锥虫isp。与Gastrochaenolites isp相关。Petroxestes pera和Petroxestes pera在第一次发现的阿尔比亚晚期海侵系列硬地中得到证明，该硬地覆盖在撒哈拉阿特拉斯东部 Ouled Nail 山脉的大陆 Intercalaire。这块坚硬的土地上覆盖着属于Ostrea falco Coquand 的牡蛎壳。研究的硬地在温暖的环境中发育，横向延伸至少 6 公里。它被解释为侵蚀海侵表面。该遗迹属Petroxestes报道首次从非洲。这种地层组合归因于锥虫类地层相。