Sliding rapidly for miles on sandstone. How abrasive.
Years agoI hiked up that canyon.
For most of the time there is no trail and you must walk in the river, due to the walls being right at the river’s edge.
Speaking of abrasive: my filthy tennis shoes ended up brand new clean looking from all the tumbling rocks rubbing up against them.
Never have I been able to duplicate that cleanliness with a garden hose.