glacial grooves
grooves or gouges cut into the bedrock by gravel and rocks carried by glacial ice and meltwater; also called glacial striations.
glacial_grooves.jpg

Striated Graywackie, Yale Glacier, Alaska. 1997. Parallel striations and bedrock fracture trends (across the left side of the image) are clearly visible in this photo.

Tom Lowell, University of Cincinnati
Topic(s):
glaciers