Today a hike to Mill canyon area to view a recent (within several years) crack that has formed in the rock. We surmise it is due to some shifting in the earth, possibly seismic. The edges of the crack are sharp and unweathered and having lowered a weight on a 50 ft rope, it is greater than 50 ft deep.
I need to go back with several hundred yards of fishing line to see how deep it goes. You can see from some of the photos that the cliff face will drop into the canyon, but when is anyone's guess.
Also some cool petroglyphs.
Enjoy, I sure did.

Peter