Tim Fitzharris / Wildflowers and cacti, Caprock Canyons State Park, Texas

Yva Momatiuk & John Eastcott / Toadstool Caprocks created by erosion, near Paria River, Grand Staircase-Escalante National Monument, Utah

John Shaw / Hoodoo with caprock at sunset. Escalante Canyons Wilderness Area, Utah, USA, October.

John Shaw / Hoodoo formation with caprock, at Stud Horse Point, Utah, January.

Jack Dykinga / Mexican Hat, a caprock formation against eroded strata, Colorado Plateau, Great Basin Desert, USA, October 2018.

Jack Dykinga / Mexican Hat, a caprock formation against eroded strata, Colorado Plateau, Great Basin Desert, USA, October 2018.

Jeff Foott / Hoodoos, Toadstool Caprock, near Paria River, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Caprock Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Caprock Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Caprock Ruin at sunset, Cedar Mesa, Bears Ears National Monument, Utah

Jeff Foott / Caprock Ruin at sunset, Cedar Mesa, Bears Ears National Monument, Utah

Tim Fitzharris / Feather Dalea (Dalea formosa) flowering, Caprock Canyons State Park, Texas

Tim Fitzharris / Sandstone cliffs, Caprock Canyons State Park, Texas

Tim Fitzharris / Sandstone mountains, Caprock Canyons State Park, Texas

Doug Wechsler / Aerial view of red shales, sandstones, siltstones and mudstones landscape, Caprock Canyons State Park, Briscoe County, Texas, USA

Tim Fitzharris / Caprock Canyons State Park, Texas

Tim Fitzharris / Caprock Canyons State Park, Texas

Tim Fitzharris / Wildflowers and dried grasses, Caprock Canyons State Park, Texas

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Toadstool Caprocks, Grand Staircase-Escalante National Monument, Utah

Tim Fitzharris / Spring wildflowers in the desert, Caprock Canyons State Park, Texas

Jeff Foott / Yucca (Yucca sp) and hoodoo, Toadstool Caprock, near Paria River, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Hoodoos, Toadstool Caprock, near Paria River, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Hoodoos, Toadstool Caprock, near Paria River, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Hoodoos, Toadstool Caprock, near Paria River, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Hoodoo, Toadstool Caprock, near Paria River, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Hoodoos, Toadstool Caprock, near Paria River, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Hoodoo, Toadstool Caprock, near Paria River, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Caprock Ruin, Cedar Mesa, Bears Ears National Monument, Utah

Tim Fitzharris / Feather Dalea (Dalea formosa) near sandstone cliff, Caprock Canyons State Park, Texas

Tim Fitzharris / Hoodoos, Valley of Dreams, Bisti/De-Na-Zin Wilderness, New Mexico

Tim Fitzharris / Feather Dalea (Dalea formosa) flowering, Caprock Canyons State Park, Texas