The effect of jointing on glacial erosion of bedrock hills in southern Finland

Abstract

While studying road cuts in various parts of southern Finland the authors have observed an obvious causality between jointing and the surface forms of bedrock hills. Continental ice moving over the terrain has loosened rock segments from the topmost parts of bedrock hills, in many places clearly along existing joints. Exposed joint surfaces are often marked with striae scratched by rocks in the moving ice. Actual erosion on these surfaces, how­ever, seems to have been limited