New trilobite material and the first graptolites from outcrop are described from the Am5 member of the Amdeh Formation near Al Fleij in northeast Oman. The sediments in which these faunas occur are interpreted as distal-shelf deposits with storm beds packed with brachiopods and orthoconic nautiloids. The deposits and its faunas are considered of late Darriwilian age and younger than the shallower-water Am5 deposits known from other outcrops. No palynomorphs could be recovered to confirm this due to the increased burial temperature the Al Fleij area has experienced.

The trilobites are of considerable palaeo-biogeographic interest as few faunas of this age are known from the Arabian Plate, though their preservation precludes the establishment of new species. They include Isabelinia aff. glabrata, Liomegalaspides sp., Neseuretus tristani, Neseuretinus sp. and the deeper-water forms, Cyclopyge cf. C. bohemica, Arthrorhachis sp. and Brachypleura sp. The graptolites are pendent Didymograptus spp. of later Darriwilian type.

Rare elements of the conodonts Nordiora, Amorphognathus and Microzarkodina have been recovered from shell beds that occur interbedded with the faunas. They too indicate a late Darriwilian age and differ from richer, restricted, shallow-water faunas known from the Am5 at other locations, and the more cosmopolitan shelf fauna from the Ayim Member of the Rann Formation of the United Arab Emirates.

A coarser, 80 m-thick, terrestrial sequence containing igneous pebbles, included in the Am5 in the 1980s, is shown from the occurrence of fossil plants to be of Permian age and probably equivalent to the Basal Saiq Clastics of Jabal al Akhdar.

新的三叶虫材料和露头的第一批笔石是在阿曼东北部 Al Fleij 附近 Amdeh 组的 Am5 层中描述的。这些动物群所在的沉积物被解释为远端陆架沉积物，其中的风暴床充满了腕足动物和正交鹦鹉螺动物。这些沉积物及其动物群被认为是达里威尔时代晚期，并且比其他露头已知的浅水 Am5 沉积物更年轻。由于 Al Fleij 地区埋藏温度升高，无法找到孢粉形态来证实这一点。

三叶虫具有相当大的古生物地理学意义，因为阿拉伯板块中很少有这个时代的动物群，尽管它们的保存阻碍了新物种的建立。其中包括伊莎贝丽尼亚aff。glabrata、Liomegalaspides sp. 、Neseuretus tristani、Neseuretinus sp. 。和深水形式，Cyclopyge cf. 波希米亚梭菌,节节虫sp. 和Brachypleura sp。笔石是悬垂的Didymograptus spp。后来的达里维尔类型。

牙形刺属Nordiora、Amorphognathus和Microzarkodina的稀有元素已从与动物群互层的贝壳床中回收。它们也表明达里维尔时代晚期，与其他地点的 Am5 地区已知的更丰富、受限制的浅水动物群以及来自阿拉伯联合酋长国兰恩组 Ayim 段的更为国际化的陆架动物群不同。

一个较粗糙的、80 米厚的陆地序列包含火成卵石，包括在 1980 年代的 Am5 中，从植物化石的出现情况来看，它属于二叠纪时代，可能相当于 Jabal al Akhdar 的 Basal Saiq Clastics。