the pennsylvanian to lower permian, (end of the paleozoic era), supai group, is a slope-forming section of red bed deposits found at the southwest-to-south colorado plateau. cliff-forming interbeds (sandstone) are noticeable throughout the group, as well as the largest cliff-former the topmest member esplanade sandstone. the supai group is especially exposed throughout the grand canyon in northwest arizona, as well as local regions of southwest utah (virgin river valley region). it outcrops southeastwards in arizona at chino point (south aubrey valley), sycamore canyon, and famously at sedona as parts of oak creek canyon. in the sedona region, it is overlain by the hermit formation, and the colorful schnebly hill formation.