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The chronology of upper pleistocene stratified slope‐waste deposits in central Italy

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  • M. Coltorti
  • F. Dramis

Abstract

Stratified slope‐waste deposits are widespread in central Italy, even at elevations close to the present coastline. They are evidence of the cold climatic conditions which affected the area during the cold stages of the Upper Pleistocene. Their occurrence was strongly influenced by bedrock lithology (they are common on slopes composed of micritic and marly limestone). Detailed morphostratigraphic analysis and 14C dating of alluvial and inter‐fingered slope‐waste deposits in a mountain area of the Umbria‐Marche Apennine (Upper Esino River basin) allows an outline of the chronological sequence of debris depositional phases during the Late Pleistocene. A few dates were also obtained from the Ponte di Crispiero sequence (in the contiguous Potenza River basin), which may be considered as a type section for the Late Pleistocene of Central Italy, Adriatic side. The stratified slope‐waste deposits were deposited after 50,000 to 60,000 years BP, in the Stadials of the Middle and Upper Pleniglacial. During the Interstadials, most of the slopes of the basin were colonized by steppe vegetation and the production of stratified debris was probaby restricted to the highest elevations. Increased rates of debris deposition occurred during the Upper Pleniglacial. Des dépǒts stratifiés de pente sont nombreux en Italie centrale. Měme à des altitudes proches du niveau actuel de la mer. Ils constituent des preuves des conditions climatiques froides qui ont régné sur la région pendant le Pléistocène supérieur. Leur existence est fortement influenceée par la lithologie (ils sont communs sur des pentes dévelopées sur des calcaires micritiques et marneux). Un analyse morphostratigraphique détaillée et des datations 14C des dépǒts alluviaux et de ruissellement interstratifiés dans une région montagneuse des Apennins de l'Ombrie‐Marche (bassin supérieur de la rivière Esino) permettent d'établir les grandes lignes de la séquence chronologique des phases de dépǒts de la fin du Pléistocène. Quelques dates ont été obtenues également dans la séquence de Ponte di Crispiero (dans le bassin contigu de la rivière Potenza), section qui peut ětre considérée comme typique de la fin du Pléistocène de l'Italie centrale du cǒté de l'Adriatique. Les dépǒts de pente stratifiés ont été déposés après 50‐60.000 ans B.P., au cours des stades du Pléniglaciaire moyen et supérieur. Pendant les interstades, la majorité des pentes du bassin

Suggested Citation

  • M. Coltorti & F. Dramis, 1995. "The chronology of upper pleistocene stratified slope‐waste deposits in central Italy," Permafrost and Periglacial Processes, John Wiley & Sons, vol. 6(3), pages 235-242, July.
  • Handle: RePEc:wly:perpro:v:6:y:1995:i:3:p:235-242
    DOI: 10.1002/ppp.3430060304
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    1. Mauro Coltorti & Andrea Brogi & Lorenzo Fabbrini & Dario Firuzabadì & Lapo Pieranni, 2011. "The sagging deep-seated gravitational movements on the eastern side of Mt. Amiata (Tuscany, Italy)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 59(1), pages 191-208, October.

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