Abstract The lower Maastrichtian deposits of the Mateur-Beja area in northern Tunisia are mainly composed of fine-grained marl and limestone alternations occasionally interbedded by coarse-grained calcarenites and gravel deposits. In the coarse-grained intervals sedimentary structures are indicative of storm-induced high-energy currents in an outer ramp to slope setting and of local reworking by bottom currents in the basin. In deeper environments, fine-grained sediments accumulated mainly while settling from storm-induced suspensions. The lower Maastrichtian deposits contain abundant Zoophycos exhibiting two main morphotypes, skirt-shaped Zoophycos in deposits around storm-wave base and tongue-shaped Zoophycos in somewhat deeper sediments. The types differ in burrow architecture, morphology of lobes, and size of structural elements. These differences are attributed to different behavioral programs modulated by the availability of benthic food that decreased seaward. Storm-affected environments seem to be a prerequisite for these Zoophycos-producers to choose their habitat.

中文翻译：

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受风暴影响环境中的动物藻：来自 Mateur-Beja 地区（突尼斯北部）马斯特里赫特下层沉积物的案例研究

摘要 突尼斯北部Mateur-Beja地区下马斯特里赫特矿床主要由细粒泥灰岩和石灰岩交替组成，偶尔夹杂粗粒方解石和砾石矿床。在粗粒层段中，沉积结构表明在外部斜坡到斜坡设置中风暴引起的高能流以及盆地底部流的局部改造。在更深的环境中，细粒沉积物主要在风暴引起的悬浮物沉淀时积累。下马斯特里赫特沉积物含有丰富的动物藻，表现出两种主要的形态类型，风暴波基部周围沉积物中的裙状藻藻和稍深沉积物中的舌状藻藻。这些类型在洞穴结构、裂片的形态和结构元素的大小方面有所不同。这些差异归因于由向海减少的底栖食物的可用性调节的不同行为程序。受风暴影响的环境似乎是这些 Zoophycos 生产者选择栖息地的先决条件。