Trace fossil assemblages from the Lower Devonian (Lochkovian-Emsian) of the Touat area (Reggane Basin, Algerian Sahara) and their palaeoenvironmental significance
Abdelmalik Draoui, Mohamed Bendella, Bruno Ferré, Mostapha Benzina, Mansour Zaagane, Khaldia Ziouit, Abdelouafi Boutadaraa, Ahmed Boutadaraa, Abderraouf Salah
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引用次数: 0
Abstract
Mixed siliciclastic-carbonate deposits of Lower Devonian (Lochkovian-Emsian) age are exposed in the northeastern part of the Reggane Basin (Touat region). Based on lithological, sedimentological and palaeontological data, these deposits are subdivided into four distinct lithological units: Unit A characterises the Silurian-Devonian transitional zone; Unit B consists of a thick succession of Lochkovian-Pragian age, whereas Units C and D both document Emsian deposits. The studied section exhibits low to moderate ichnodiversity consisting of 14 ichnotaxa: Arenicolites isp., Chondrites isp., Curvolithus multiplex, Lockeia siliquaria, Monomorphichnus isp., Neonereites bisserialis, Neonereites uniserialis, Ophiomorpha isp., Palaeophycus isp., Planolites isp., Psilonichnus upsilon, Skolithos linearis, S. verticalis, and Thalassinoides isp. Both Curvolithus multiplex and Psilonichnus upsilon are documented for the first time from Palaeozoic deposits of the Saharan platform. These ichnofaunas are commonly ascribed to the Skolithos and Cruziana ichnofacies. Five distinct ichnoassemblages (Ichnoassemblages A to E) were defined, reflecting palaeoenvironmental changes from the foreshore to upper offshore zones, with frequent storm influence. Ichnofabric analysis of the section studied reveals six levels with different bioturbation intensities showing different palaeoecological conditions in various environmental settings (Monospecific Planolites, Lower combined Skolithos-Arenicolites, Combined Skolithos-Thalassinoides, Monospecific Skolithos, and Upper combined Skolithos-Arenicolites and Reburrowed Chondrites ichnofabrics). The vertical evolution of these deposits displays the successive deepening and shallowing trends recorded during the Lower Devonian in this area.
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.
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