Ranger Robb:
Abajo Mountains quartz diorite porphyry, granodiorite porphyry, Cave Spring, Needles District Canyonlands NP, Utah
Ranger Robb:
Defferential erosion between harder Sanstone and softer Silt/mudstone of the Cedar Mesa Formation, , Cave Spring, Needles District Canyonlands NP, Utah
Ranger Robb:
Differential erosion in Cedar Mesa Sandston, near Cave Spring, Needles District Canyonlands NP, Utah
Ranger Robb:
Seep near Cave Spring, Needles District Canyonlands NP, Utah
Ranger Robb:
Cave Spring, Needles District Canyonlands NP, Utah
Ranger Robb:
Tephoni, Needles District, Canyonlands National Park, Utah