Middle Miocene trace fossils from the Tenes area (NW Algeria) and their palaeoenvironmental implications

IF 1.4 4区地球科学 Q3 BIODIVERSITY CONSERVATION

Palaeobiodiversity and Palaeoenvironments Pub Date : 2023-12-16 DOI:10.1007/s12549-023-00594-y

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Abstract

The Miocene succession (Allala River Sandstones and Tenes Blue Marls Formation) that crops out in the Tenes area, situated in the northeast of the Lower Chelif Basin in NW-Algeria, contains a low-diversity assemblage of trace fossils. Fifteen (15) ichnogenera were identified: Arenicolites, Beaconites, Cylindrichnus, Diplocraterion, Macaronichnus, Ophiomorpha, Palaeophycus, Parahaentzschelinia, Planolites, Rosselia, Skolithos, Taenidium, Teichichnus, Thalassinoides and Zoophycos. Ethologically, these ichnogenera chiefly display dwelling and feeding activities. The presence of thick, deep-tier, scattered, mainly vertical dwelling burrows attributed to the Skolithos ichnofacies indicates high energy conditions, normal oxygenation and soft substrate. Moreover, elements of the Cruziana ichnofacies show more varied behavioural strategies and higher inchnodiversity with the dominance of horizontal burrows of deposit-feeders. This ichnological study supports the palaeoenvironmental interpretation based on sedimentological analysis of a wave-dominated siliciclastic platform (backshore to offshore), allowing a more precise zonation of the shoreface zone (middle/upper and lower shoreface). In addition, this study allows evaluation of variable degrees of storm influence in response to the contrasting palaeogeomorphology of the coastline.

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特内斯地区（阿尔及利亚西北部）中新世痕量化石及其对古环境的影响

摘要位于阿尔及利亚西北部下切里夫盆地东北部的特内斯地区的中新世演替（阿拉拉河砂岩和特内斯蓝泥灰岩地层）中，痕量化石的多样性较低。已确定 15 个生物属：Arenicolites、Beaconites、Cylindrichnus、Diplocraterion、Macaronichnus、Ophiomorpha、Palaeophycus、Parahaentzschelinia、Planolites、Rosselia、Skolithos、Taenidium、Teichichnus、Thalassinoides 和 Zoophycos。从伦理学角度看，这些偶人属主要表现为居住和觅食活动。Skolithos 拟生动物具有厚实、深层、分散、主要垂直居住的洞穴，这表明它们具有高能量条件、正常的含氧量和松软的基质。此外，克鲁兹亚纳生物群（Cruziana ichnofacies）的元素显示出更多样的行为策略和更高的技术多样性，以沉积物取食者的水平洞穴为主。该水螅学研究支持基于对以波浪为主的硅质碎屑岩平台（从后岸到近海）的沉积学分析所做的古环境解释，从而可以更精确地划分海岸带（中/上部和下部海岸带）。此外，这项研究还可以评估风暴对海岸线古地貌的不同影响程度。

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来源期刊

Palaeobiodiversity and Palaeoenvironments BIODIVERSITY CONSERVATIONPALEONTOLOGY -PALEONTOLOGY

CiteScore

3.90

自引率

14.30%

发文量

期刊介绍： Palaeobiodiversity and Palaeoenvironments is a peer-reviewed international journal for the publication of high-quality multidisciplinary studies in the fields of palaeobiodiversity, palaeoenvironments and palaeobiogeography. Key criteria for the acceptance of manuscripts are a global scope or implications of problems on a global scale significant not only for a single discipline, a focus on the diversity of fossil organisms and the causes and processes of change in Earth’s history. The topics covered include: Systematic studies of all fossil animal / plant groups with a special focus on palaeoenvironmental investigations, palaeoecosystems and climate changes in Earth’s history, environment-organism interaction, comparison of modern and ancient sedimentary environments, palaeoecology and palaeobiogeography.