Tim Fitzharris / Cathedral Rock at sunset, Coconino National Forest, Arizona

Jack Dykinga / Autumnal Bigtooth Maples (Acer saccharum grandidentatum), West Fork Oak Creek, Coconino National Forest, Arizona

Jack Dykinga / Red and Yellow coloured Bigtooth Maples (Acer saccharum grandidentatum) in Autumn, West Fork Oak Creek, Coconino National Forest, Arizona

Jack Dykinga / West Fork Oak Creek at base of Supai sandstone cliffs, mixed forest of oak, maple and conifers in background, Coconino National Forest, Arizona

Tim Fitzharris / Cactus and Cathedral Rock formation at sunset, Coconino National Forest, Arizona

Tim Fitzharris / Oak Creek, Coconino National Forest, Arizona

Tim Fitzharris / Oak Creek in Coconino National Forest, Arizona

Tim Fitzharris / Fall color at Oak Creek Canyon, Coconino National Forest, Arizona

Tim Fitzharris / Shallow cave in Oak Creek Canyon, Coconino National Forest, Arizona

Tim Fitzharris / Cathedral Rock formation reflected in pool, Coconino National Forest, near Sedona, Arizona

Tim Fitzharris / Ponderosa Pine (Pinus ponderosa) trees and cliff, Coconino National Forest, Arizona

Tim Fitzharris / Ponderosa Pine (Pinus ponderosa) trees, Mogollon Rim, Mazatzal Wilderness, Coconino National Forest, Arizona