Systematics A description of the upper Cenomanian rudist fauna from the western Saharan Atlas, Guir basin and Tinrhert Hamada (Saharan platform) in southern Algeria is presented here. The present study is documented from seven measured stratigraphic sections. The rudist-bearing limestones show different types of diagenetic alteration (e.g., silicification, dissolution and dolomitisation). The rudist fauna consists of canaliculate rudists (Caprinula boissyi, C. sharpei), radiolitids (Sauvagesia sharpei, S. nicaisei, Durania blayaci, D. arnaudi) and requieniids (Apricardia sp.) indicating a late Cenomanian age. The rudist-bearing limestones document in term of biotic zonation and the local environment change an ecologic succession of three rudist biofacies: (B1) caprinulid biofacies, (B2) radiolitid biofacies and (B3) Apricardia biofacies. These are compared to the Cenomanian rudist-bearing successions from around the Mediterranean Tethys, whereas are emphasized and the palaeobiogeographic similarities with the western Mediterranean province are emphasized.

中文翻译：

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来自阿尔及利亚南部的上晚期森诺曼阶 rudists：系统学描述、生物地层学、古生态学和古生物地理学

系统学 此处介绍了来自阿尔及利亚南部的西撒哈拉阿特拉斯、吉尔盆地和 Tinrhert Hamada（撒哈拉地台）的上森诺曼尼亚原始动物群的描述。本研究记录了七个测量的地层剖面。含原石的石灰岩显示出不同类型的成岩作用（如硅化、溶解和白云石化）。rudist 动物群包括canaliculate rudists (Caprinula boissyi, C.sharpei), radiolitids (Sauvagesiasharpei, S.nicaisei, Durania blayaci, D. arnaudi) 和requieniids (Apricardia sp.) 表明晚 Cenomanian 时代。含砂岩的石灰岩在生物分带和当地环境方面改变了三个砂岩生物相的生态演替：（B1）山羊生物相，（B2）放射性生物相和（B3）Apricardia 生物相。