Étude stratigraphique, sédimentologique et magnétique des dépôts Pléistocène moyen et supérieur de la Baume Moula-Guercy (Soyons, Ardèche)

Abstract : The study of the Middle and Upper Pleistocene infilling of Moula-Guercy cave using sedimentological, micromorphological and magnetic techniques provides a new and precise stratigraphical frame for this site. It allows the characterization of large sedimentary units and, within each, the description of discontinuities revealed by variations in both intensity and origin of sedimentary inputs. The base of the infilling is an active karst deposit, set up for a period during which the cave was not subject to exterior climatic influences. The calcareous sand deposited during this, probably cold, phase did not undergo important post-depositional geochemical evolution. During the deposition of the middle part of the infilling, the cave opened, and sedimentation changed. We note an important eolian influence, but also a well marked anthropological impact under a more temperate climate. The upper part of the infilling shows a succession of some units deposited under cold and dry climate, and others deposited under milder conditions. The geochemical and biological post-deposit evolution of these deposits remains moderate.
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Submitted on : Thursday, November 19, 2015 - 3:57:19 PM
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Thibaud Saos, Abderrezak Djerrab, Alban Defleur. Étude stratigraphique, sédimentologique et magnétique des dépôts Pléistocène moyen et supérieur de la Baume Moula-Guercy (Soyons, Ardèche). Quaternaire, Centre National de la Recherche Scientifique, 2015, p. 237-251. ⟨http://quaternaire.revues.org/7065⟩. ⟨10.4000/quaternaire.7065⟩. ⟨hal-01231180⟩

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