I collected this rock in 1998 in Sheets Gulch in Capitol Reef National Park, along the Waterpocket fold. The deformation bands in Navajo Sandstone at Sheets Gulch are strike-slip in nature. This is the smoothest fault surface I own. When stresses run high near the time of mid-term exams, I encourage students to chill out by rubbing their hands over this great fault surface, and experiencing the soothing effect.
Age & Formation
Navajo Sandstone of Jurrassic age, i.e., ~170 Ma.