Thanks for the nice comments guys

Went out to the eastern side of Mule Shoe canyon. Hiked down low and then scrambled up to the top of the canyon. Hiked to the end so we could come back on the opposite side, as there was no good way to go to the bottom and get back up.
There was a lot of Chert of various colors and some big boulders of it. I found a nice piece that used to be part of a knife blade or skinning tool. (Chert is a fine-grained silica-rich microcrystalline, cryptocrystalline or microfibrous sedimentary rock, and flint is a type of Chert)

Peter