Three-part erosion sequence showing water run-off and freeze/thaw action on the steep slopes of the Amphitheater area creating fins of harder rock which later erodes along vertical cracks to form free-standing vertical columns known as hoodoos.
Three-part erosion sequence showing water run-off and freeze/thaw action on the steep slopes of the Amphitheater area creating fins of harder rock which later erodes along vertical cracks to form free-standing vertical columns known as hoodoos.
Abbr=PUB
U.S. National Park Service
Project=Folder; Art_Registration_No=PUB-0080 ; Reflective Art