Orsolya Haarberg / Coastal rocks with algae and limpets, Tomma Island, Nesna, Helgeland, Nordland, Norway, July 2009

Floris van Breugel / Reflected light on various sandstone surfaces in a narrow slot canyon in Arizona, USA, June

Oriol Alamany / Angel Glacier with morraine, Jasper National Park, Rocky Mountains, Alberta, Canada

Linda Pitkin / 2020VISION / Cliffs showing rock striations and geological folding, Pettico Wick, St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, August 2011

Jack Dykinga / Bands of red and yellow strata in petrified sand dunes, sunset, Paria Canyon-Vermilion Cliffs Wilderness, Arizona, USA

Jack Dykinga / Petrified sand dunes with eroded cross hatch sandstone strata at dawn, Paria Canyon-Vermilion Cliffs Wilderness, Arizona, USA with first winter snow and Juniper bushes {Juniperus osteosperma}

Jack Dykinga / Petrified sand dunes with eroded sandstone striations at sunset, Paria Canyon-Vermilion Cliffs Wilderness, Arizona, USA

Jack Dykinga / Sinous banded narrows of Matkatamiba Canyon, Grand Canyon NP, Arizona, USA

Jack Dykinga / Petrified sand dunes with eroded red and yellow sandstone bands, Paria Canyon-Vermilion Cliffs Wilderness, Arizona, USA, and Pointleaf manzanita {Arctostaphylos pungens}

Jack Dykinga / Petrified sand dunes with eroded sandstone at sunset, Paria Canyon-Vermilion Cliffs Wilderness, Arizona, USA

Tim Fitzharris / Sandstone striations and erosional features, Badlands National Park, South Dakota

Ingo Arndt / Eroded landscape, Sandstone striations and erosional features, Badlands National Park, South Dakota, USA September 2014.