Vincent Grafhorst / Minden / River in sandstone cave, Sof Omar Cave, Ethiopia

Guy Edwardes / Jurassic Coast at West Bay, Bridport, Dorset, England, UK. December 2016.

Jeff Foott / The Citadel Ruins, Cedar Mesa area, Bears Ears National Monument, Utah

Jack Dykinga / Fremont cottonwood trees (Populus fremontii) with autumnal leaves, Coyote Gulch,Grand Staircase-Escalante National Monument, Utah, USA.

Jack Dykinga / Stevens Arch reflected in the amid sand bar ripples Escalante Canyon, Canyon National Recreation Area, Utah, USA

Jack Dykinga / Banded Navajo Sandstone slot canyon in the Escalante Canyon complex. Grand Staircase-Escalante National Monument, Utah, USA.

Jack Dykinga / Cap-rocks on the rim of the Escalante Canyon at dawn. Grand Staircase-Escalante National Monument, Utah, USA, October 2012.

Jack Dykinga / Devils Garden, Grand Staircase-Escalante National Monument, eroded hoodoo sandstone formations. Utah

Jack Dykinga / Devils Garden, eroded hoodoo sandstone formations. Grand Staircase-Escalante National Monument, Utah, USA. October.

Jack Dykinga / Landscape of eroded sandstone rock formations, Grand Staircase-Escalante National Monument, Utah, USA, October 2013.

Jack Dykinga / Patterns in sandstone cliffs in Grand Staircase-Escalante National Monument, Utah, USA, October 2014.

Jack Dykinga / Ponderosa pine (Pinus ponderosa) growing in Grand Staircase-Escalante National Monument, Utah, October 2014.