Colorado Plateau, AZ. / Concretion balls line fracture lines in petrified sand dune formation with lichen scaring calcification marks. 406V4
Colorado Plateau, AZ. / Desert varnish colored canyon walls in Navajo Sandstone cliffs showing drip marks across the face. 406V6
Colorado Plateau, AZ. / White sandstone petrified sand dunes glow in pre-sunrise light with solitary Pinyon pine, Pinus sp. 406P5
