Rare ammonite species are reported from the Inferior Oolite Formation of Dorset. In the Aalenian the ammonite Shahrudites is described from the Scissum Zone for the first time and Malladaites is recorded from the Murchisonae Zone. Tmetoceras regleyi occurs in the Scissum and Murchisonae zones and Tmetoceras henriquesae is described from the Concavum Zone. In the Lower Bajocian, specimens of Zurcheria are presented from the Discites Zone. A revised zonal scheme is used for the Aalenian Stage and two new biohorizons are introduced. The Leioceras subglabrum biohorizon is erected in the Opalinum Subzone and Leioceras evolutum in the Bifidatum Subzone.

据报道，多塞特郡的下级鲕粒岩组有罕见的菊石物种。在阿连期的菊Shahrudites从Scissum区描述首次和Malladaites从Murchisonae区记录。Tmetoceras regleyi出现在 Scissum 和 Murchisonae 区，Tmetoceras henriquesae来自 Concavum 区。在下 Bajocian 中，Zurcheria 的标本来自 Discites 区。Aalenian 阶段使用了修改后的地带方案，并引入了两个新的生物地平线。该Leioceras subglabrum biohorizo​​n在Opalinum亚带竖立Leioceras evolutum在Bifidatum亚带。