Seems to me it is likely that this process is what made the GRAND CANYON. The Colorado River didn’t carve it out. The Colorado River is just the deepest part of the megaslump where water ended up. The river is the product of the Canyon, not the other way around.
Looks like a great SAFE PLACE to me.
The first assumption you have to make for that is that it was all frozen along that run. The second is that it was all soil and/or regolith. The third is that it subsequently was metamorphosed all the way up the scale to nearly granite after the fact.