noun
glacial striae; glacial striations; glacial grooves
Technical term in geology for scratches or grooves on bedrock caused by glacial abrasion.
この地域の岩盤には、氷河擦痕がはっきりと残っている。
Glacial striations are clearly visible on the bedrock in this area.
Compound of 氷河 (glacier) and 擦痕 (scratch mark).