Les formes et les marques de l'érosion glaciaire du plancher rocheux: Signification, terminologie, illustration

摘要: Abstract Glacial erosion is characterized by a grain abrasion of the bedrock, or removal very small fragments which results in polish scratches varying size. It may also weaken rock fracturation and leave train crescentic fractures, shape quarried lee-forms. Differential involved since glacier bed made more less resistant rocks that action glacial flow varies time space. So kind forms varies: hollows worked like grooves protruding veins if encloses hard cores. scouring downstream case striations concave chattermarks, upstream walls. The scale be larger when protuberance shaped ice becomes an unsymmetrical so called roche moutonnee carving affect such form on all sides single primary effect. authors' aim to present qualitative quantitative hierarchical classification terms these minor marks as better evaluate morphological bedrock.