Glacial striae on quartzite, metamorphic rock, Desbarats, Ontario. Scratches on top of this quartzite were formed by fragments of rock in the base of a glacier which moved over it during the Ice Age.
Glacial striae on quartzite, metamorphic rock, Desbarats, Ontario. Scratches on top of this quartzite were formed by fragments of rock in the base of a glacier which moved over it during the Ice Age.
