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15
pages
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Français
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Documents
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1974
Description
The Middle Terrace at Amiens-St-Acheul and Avre valley is important. Firstly it is the type-site of the Middle Acheulean of St-Acheul ; it also shows up some of the climatic complexity of the late Mindel period. As Commont and Breuil suggested, it can probably be correlated with the Middle Terrace of South-East England which contains the famous Swanscombe site. The Middle Terrace of the Somme contains three units, placed in superposition. These are : 1) Coarse periglacial gravels transported by the Avre and the Somme, containing in its upper bed Middle Acheulean industry with some Levallois technique. 2) River sands, rich in pollen, fauna and small mammals, deposited in a moderately cold climate with a noticeable warm period in the middle of the deposit. These river sands are covered with loess and chalk-mud flows, whose fauna and sediment both show a definitely cooler climate. 3) An alteration surface in the form of a soil which is at the origin of the chocolate-brown clay nearly always disturbed by solifluxion in the early Riss. We may consider that this soil was formed at the Mindel-Riss interglacial period and is contemporary with Mediterranean or Lusitanian-type flora and malacological fauna at La-Celle-sous-Moret and Saint-Pierre-lès-Elbeuf in the Seine valley. This interpretation would put the periglacial deposits of the Middle Terrace into the Late Mindel (Anneyron level in Lower Dauphiné).
13 pages
Source : Persée ; Ministère de la jeunesse, de l’éducation nationale et de la recherche, Direction de l’enseignement supérieur, Sous-direction des bibliothèques et de la documentation.
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Publié par
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Publié le
01 janvier 1974
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Langue
Français
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Poids de l'ouvrage
3 Mo