In far southern Oregon, on Interstate 5, at the peak of Ashland pass, they had blasted oout about 200 feet of rock on both sides of the road.
It is sedimentary, and if you go about twenty miles south, you get into the slates and igneous stuff near Shasta.
I saw some odd forms in the rock layers one day and busted them out.
They are roots. Petrified roots in the rock layers.
At 4400 feet. And still rising.