Taphonomic pathway of exceptionally preserved fossils in the Lower Ordovician of Morocco
| Autor: | Bernard Pittet, Farid Saleh, Khaoula Kouraiss, Pierre Sansjofre, Khadija El Hariri, Jean-Philippe Perrillat, Muriel Vidal, Bertrand Lefebvre, Victoire Lucas, Stefan V. Lalonde, Pierre Gueriau |
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| Přispěvatelé: | Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Géosciences Océan (LGO), Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Institute of Earth Sciences [Lausanne], Université de Lausanne = University of Lausanne (UNIL), Equipe de recherche E2G, Université Cadi Ayyad [Marrakech] (UCA), Laboratory of Geoscience and Environment, Université Ibn Zohr [Agadir], Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Université de Brest (UBO)-Université de Bretagne Sud (UBS)-Centre National de la Recherche Scientifique (CNRS)-Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Université de Lausanne (UNIL), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010506 paleontology
Taphonomy Fauna Geochemistry Paleontology Weathering Lagerstätte engineering.material 010502 geochemistry & geophysics 01 natural sciences Space and Planetary Science [SDU]Sciences of the Universe [physics] [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy Facies Ordovician engineering 14. Life underwater Pyrite [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology Oil shale Geology ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences |
| Zdroj: | Geobios Geobios, 2020, 60, pp.99-115. ⟨10.1016/j.geobios.2020.04.001⟩ Geobios, Elsevier, 2020, 60, pp.99-115. ⟨10.1016/j.geobios.2020.04.001⟩ |
| ISSN: | 0016-6995 |
| Popis: | The Fezouata Shale in Morocco is the only Lower Ordovician Lagerstatte to yield a diverse exceptionally preserved marine fauna. Sediments of this formation have yielded soft to lightly sclerotized taxa that were previously unknown from the Ordovician. Yet the taphonomic pathway of fossils from this formation remains poorly understood. Here, based on drill core material, a close association between exceptional preservation and a specific sedimentary facies is evidenced in the Fezouata Shale. This facies corresponds to calm sea-bottoms, sporadically smothered by distal storm deposits. The patterns of exceptional preservation in this facies indicate that most animals were dead and decayed on the seafloor prior to their burial by distal storm deposits. Furthermore, contrasted elemental and molecular compositions between fresh-cored and altered materials show that surface deposits of the Fezouata Shale were substantially affected by recent weathering. This weathering resulted in the leaching of organic materials from fossils originally preserved as carbonaceous compressions and the transformation of pyrite into iron oxides. Understanding the processes behind the current patterns of soft tissue preservation in the Fezouata Shale is essential prior to any palaeontological description, especially of taxa with no current representatives. |
| Databáze: | OpenAIRE |
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