The Messinian shallow marine diatomaceous deposits (Tripoli Diatomite Formation) of the Lower Chelif basin (northwestern Algeria) display a moderate diversity and high abundance of decapod crustacean trace fossils, preserved mainly as endichnia, epichnia and hypichnia. These deposits consist of diatomites intercalated by diatomaceous marls and rarely micritic limestones, containing nine ichnospecies from seven ichnogenera, dominated by domichnion trace fossils (Diplocraterion isp., Ophiomorpha isp., O. nodosa, Palaeophycus isp., Planolites isp., cf. Skolithos isp., Spongeliomorpha isp., Thalassinoides isp. and T. suevicus). Two ichnofabrics have been identified, represented by the Ophiomorpha ichnofabric which characterises the diatomaceous deposits of the Djebel Murdjadjo carbonate platform, and the Thalassinoides ichnofabric in the Tessala–Beni Chougrane carbonate platform. The ichnological, palaeontological and sedimentological data confirm that the trace fossil bearing diatomaceous beds were deposited in a nearshore shallow sea under moderate-to high-energy conditions constituting a part of the Skolithos ichnofacies in the Djebel Murdjadjo carbonate platform, and the Cruziana ichnofacies in the Tessala–Beni Chougrane carbonate platform. The comparison between shallow- and deep-marine diatomites indicates a regressive sequence in the deep diatomites, with abundant Chondrites and Zoophycos at the base of the succession grading downward into Thalassinoides-dominated trace fossil assemblage in the uppermost part, which is similar to the shallow-tier trace fossils of the two carbonate platforms, represented by Ophiomorpha-dominated ichnoassemblage in the Djebel Murdjadjo carbonate platform, and by Thalassinoides-dominated ichnoassemblage in the Tessala–Beni Chougrane carbonate platform.

在墨西拿的下Chelif盆地（阿尔及利亚西北部）的浅海沉积硅藻土（硅藻土的黎波里形成）显示温和的多样性和高丰度十足甲壳动物的遗迹化石，保存主要表现为endichnia，epichnia和hypichnia。这些沉积物包括由硅藻土硅藻插的泥灰岩和泥晶很少灰岩，含七个ichnogenera，通过domichnion遗迹化石为主（9个ichnospecies Diplocraterion ISP， Ophiomorpha ISP， O.性多动脉炎， Palaeophycus ISP， Planolites ISP，参见Skolithos isp。， Spongeliomorpha isp。，Thalassinoides isp。和T. suevicus ）。已经确定了两种鱼鳞织物，以蛇纹石为代表，它代表了Djebel Murdjadjo碳酸盐台地的硅藻类沉积物，以及在Tessala-Beni Chougrane碳酸盐台地中的Thalassinoides ichnofabric。的ichnological，古生物和沉积数据证实，跟踪化石轴承硅藻土床分别构成的一部分中度至高能条件下沉积在近岸浅海Skolithos在Djebel Murdjadjo碳酸盐平台遗迹相，并且CruzianaTessala-Beni Chougrane碳酸盐台地的岩相。浅海和深海硅藻土的比较表明，深部硅藻土具有递减序列，在演替的基部有丰富的球粒陨石和动物藻类，在最下部逐渐分解为以Thalassinoides为主的痕迹化石组合，这与浅层硅藻土相似。在Djebel Murdjadjo碳酸盐台地中以Ophiomorpha为主的鱼鳞组合，以及在Tessala–Beni Chougrane碳酸盐台地中以Thalassinoides为主的鱼鳞组合代表了这两个碳酸盐台地的层状化石。