The Cenomanian Smail Marl Formation in the Bellezma and Aures mountains of northeastern Algeria is well exposed and rich in macroinvertebrates, including cephalopods. Twenty-five ammonite species and two nautiloid species from the Thénièt El Manchar, Djebel Metrassi and Djebel Bouarif sections are described and seven assemblage zones proposed as provisional working units: Mantelliceras mantelli–Sharpeiceras laticlavium Assemblage Zone (lower Cenomanian), Mantelliceras dixoni Assemblage Zone (uppermost lower Cenomanian), Cunningtoniceras inerme Assemblage Zone (lower middle Cenomanian), Acanthoceras rhotomagense and Acanthoceras cf. rhotomagense Assemblage Zone (middle middle Cenomanian), Acanthoceras amphibolum Assemblage Zone (upper middle Cenomanian), Acanthoceras jukesbrownei Assemblage Zone (uppermost middle Cenomanian), and Neolobites vibrayeanus Assemblage Zone (lower upper Cenomanian). The lower Cenomanian Mantelliceras mantelli–Sharpeiceras laticlavium Zone is subdivided into the Submantelliceras aumalense, Sharpeiceras schlueteri and Mantelliceras saxbii subzones. The base of the middle Cenomanian is marked by the disappearance of species of Mantelliceras and the appearance of the scleractinian coral Aspidiscus cristatus (Lamarck, 1801), associated with Cunningtoniceras inerme (Pervinquière, 1907). The middle Cenomanian contains abundant A. cristatus and species of Acanthoceras, i.e., A. cf. rhotomagense (Defrance in Brongniart, 1822), A. jukesbrownei (Spath, 1926) and A. amphibolum Morrow, 1935. An ammonite zonal scheme is then applied to the Cenomanian exposed in the Bellezma-Aures mountains located on the southern Tethys margin in Algeria.

阿尔及利亚东北部Bellezma和Aures山区的Cenomanian Smail Marl地层非常暴露，并且富含大型无脊椎动物，包括头足类。描述了ThéniètEl Manchar，Djebel Metrassi和Djebel Bouarif部分的25种am石物种和2种鹦鹉螺类物种，并提出了七个作为临时工作单位的组合区：Mantelliceras mantelli-Sharpeiceras laticlavium组合区（下Cenomanian），Mantelliceras dixoni组合区（Mantelliceras dixoni组合区）最上层的下Cenomanian），Cunningtoniceras inerme集合带（下中层Cenomanian），棘皮棘皮棘皮棘和棘皮棘皮组织cf. 变质磁集合带（中西诺曼期中期），Acanthoceras amphibolum组合区（西诺曼尼亚中上层），acanthoceras jukesbrownei组合区（西诺曼尼亚中上层）和Neolobites vibrayeanus组合区（Cenomanian下部上层）。下森诺曼Mantelliceras mantelli-Sharpeiceras laticlavium区被细分为Submantelliceras aumalense，Sharpeiceras schlueteri和Mantelliceras saxbii子区。切诺曼底中部的底部以Mantelliceras物种的消失和巩膜珊瑚Aspdiscus cristatus（Lamarck，1801）的出现为标志，与Cunningtoniceras inerme（Pervinquière，1907）有关。中西诺曼尼亚州含有丰富的A. cristatus和Acanthoceras属，即A. cf。 rhotomagense（Defrance in Brongniart，1822），A。jukesbrownei（Spath，1926）和A. amphibolum Morrow，1935 。然后，对位于阿尔及利亚特提斯南部边缘的贝列兹玛-奥勒斯山脉中暴露的切诺曼尼亚人采用一种亚美尼亚地带方案。