Faulted Navajo Sandstone with polish and slickenlines, Circle Cliffs uplift, Utah


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.