Mudstone with folded layers, Tucson Mountains, Arizona


I collected this rock in the early 1970’s, a time during which I was running a lot of geology field trips and mapping projects in Arrastre Wash, Ripple Wash, and Cabin Wash, while teaching field-based structural geology.  I like the way the folded layers are outlined by pink mudstone.

Age & Formation
Lower Cretaceous Amole Arkose Formation, ~120 Ma.