The Jura glaciers: palaeogeography in the Würmian circum-Alpine zone |
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| Authors: | MICHEL CAMPY ROBERT ARN |
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| Institution: | Universitéde Bourgogne, U.R.A. 157 du C.N.R.S., Centre des Sciences de la Terre, 6 Bd Gabriel, 21100 Dijon, France;Colombi-Schmutz-Dorthe SA, lngénieurs et Géologues comeil, Chemin de MaiNefer36, CH-1052 Le Mont-sur-Lausanne, Suirse |
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| Abstract: | Since the first studies on the glacial formations of the Jura mountains there have been two concepts concerning type of glaciation and ice origin during the Würmian glaciation. Some authors believed that the Jura was totally inundated by ice of Alpine origin, while others believed that the Jura had its own glaciers, originating from a single ice-cap. Several recent studies on both the NW and SE slopes of the range define the problem more accurately. This paper presents a synthesis of the new results from mapping the moraine systems and studying the stratigraphic relationships between Alpine and Jura tills. It is concluded that even the highest level of Alpine glaciers could not lead to a penetration of the Jura. A reconstruction of the extension of the Jura glaciers and their relationship with the Alpine glaciers is given, and we conclude that at the Würmian maximum a local ice-cap was present. |
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