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Le Bassin houiller de La Mure

[article]

Année 1940 28-3 pp. 249-346

restrictedrestricted Cet article contient des illustrations pour lesquelles nous n'avons pas reçu d'autorisation de diffusion (en savoir plus)

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Page 249

LE BASSIN HOUILLER DE LA MURE

par Clo vis-Henri ANGE LIER

Introduction

Au Sud de Grenoble, le Sillon alpin s'élargit entre Vercors et Taillefer. Parallèlement à la vallée encaissée du Drac, s'allonge du Nord au Sud, entre Laffrey et Ponsonnas, le plateau de la Matésine 1. C'est une vaste auge glaciaire suspendue, aménagée par une langue diffluente du glacier de la Romanche 2 dont les étapes de retrait sont jalonnées par des lacs résiduels ou de surcreusement (lacs de Pierre-Châtel, de Peti- chet, de Laffrey et lac Mort). Des dépôts morainiques de plus en plus épais vers le Sud ont comblé en partie l'auge. La surface actuelle est donc à peu près plate. D'une altitude moyenne de 900 m., elle est dominée à l'Est par des massifs aux formes assez molles dont les sommets chauves atteignent 2400 m. et à l'Ouest par des montagnes d'aspect semblable, mais qui sont cependant plus disséquées, plus boisées et moins hautes. Dans celles-ci les glaciers ont aussi aménagé les vallées longitudinales de Vaulx et de Monteynard et la profonde entaille transverse de La Motte-d'Aveillans. La bise s'engouffre entre ces

1 Carte du Service Géographique de l'Armée au 1/80.000" Vizille N.E. et S.E. 2 Et à son extrémité méridionale par une diffluence du glacier du Drac.

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