The Berda Formation corresponds to an inner-shelf stratigraphic equivalent of the Campanian-Maastrichtian outer-shelf Abiod Formation of Tunisia. The present work aims to carry out a sedimentological study of the lower unit (Upper Campanian) of Berda Formation limestones in order to interpret the limestone depositional environment and the origin of the associated micrite particles. This work is based on the study of a geological section surveyed in the Jebel Berda, typic locality, completed by microscopic observation of thin sections that allowed us identifying different carbonate facies and interpreting their depositional environments. The micrite particles have been examined with the SEM. The mineralogical and geochemical proportions and the magnetic susceptibility of the Berda Formation limestone, have been evaluated using respectively XRD, Atomic Absorption Techniques and KLY-3 Kappabridge susceptometer. The studied succession of Berda Formation includes five carbonate facies that developed within different depositional environments (1) calcisphere-rich bioclastic mudstone-wackestone within a circalittoral environment, (2) echinoderm-rich bioclastic wackestone-packstone within a shallow-marine environment (3) bioclastic rudstone within an open-marine environment, (4) peloid-rich bioclastic grainstone within high energy littoral shallow-water marine environment and (5) bioclastic dolomicrite-dolomicrosparite within a continental to marine transition environment. The studied limestones are composed of two kinds of micrite particles, (1) irregularly shaped particles resulting from fossils and micro-fossils desintegration and (2) regularly shaped polyhedral particles resulting from inorganic chemical precipitation. The carbonate facies are arranged into shallowing-up parasequences. The sedimentary facies variation and carbonate accumulation are controlled by eustatic sea-level fluctuation. In this way the biodetrital micrite occurred mainly during the transgressive intervals whereas the inorganic chemical micrite is related to the regressive intervals.

Berda 地层相当于突尼斯坎帕尼亚-马斯特里赫特外陆架 Abiod 地层的内陆架地层。目前的工作旨在对 Berda 组石灰岩的下部单元（上坎帕阶）进行沉积学研究，以解释石灰岩沉积环境和相关泥晶颗粒的起源。这项工作基于对典型地区杰贝尔伯达 (Jebel Berda) 地质剖面的研究，通过对薄片的显微观察完成，使我们能够识别不同的碳酸盐岩相并解释其沉积环境。已用SEM检查了泥晶颗粒。矿物和地球化学比例以及磁化率Berda 地层石灰岩，已分别使用 XRD、原子吸收技术和 KLY-3 Kappabridge 磁化率计进行了评估。所研究的 Berda 组层序包括五个在不同沉积环境中发育的碳酸盐岩相 (1) 环流环境中富含钙球的生物碎屑泥岩-泥岩，(2) 浅海环境中富含棘皮动物的生物碎屑泥岩-泥岩 (3)开放海洋环境中的生物碎屑砂岩，（4）高能沿岸环境中富含球状体的生物碎屑颗粒岩浅水海洋环境和（5）大陆到海洋过渡环境中的生物碎屑白云岩-白云微晶石。所研究的石灰岩由两种泥晶颗粒组成，（1）由化石和微化石解体产生的不规则形状颗粒和（2）由无机化学沉淀产生的规则形状的多面体颗粒。碳酸盐岩相排列成上浅层序。沉积相变化和碳酸盐岩聚集受海平面波动控制。这样，生物碎屑泥晶主要出现在海进期，而无机化学泥晶则与海退期有关。