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White sandstone eroded like a brain, White Pocket, Vermilion Cliffs National Monument, Arizona, United States of America, North America

A granite rock formation along the Hole in the Wall Trail in Constellation Park in Prescott giving the trail its name, Arizona, United States of America, North America

A small hill of gray bentonite clay that appears to be melting into the purple bentonite of Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Plateau and canyon country rising 2000 feet above the Grand Valley of the Colorado River, part of the Great Colorado Plateau, Colorado National Monument, Colorado, United States of America, North America

A pointed peak of bentonite in Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Layers of tan sandstone, White Pocket, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Layered sandstone, Coyote Buttes Wilderness, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Totem Pole and Yei Bi Chei rock formations and sand dunes, Monument Valley, Arizona, United States of America, North America

Single tree on limestone pavement, Ingleborough National Nature Reserve, Yorkshire Dales, North Yorkshire, England, United Kingdom, Europe

Devil's Bridge, a natural arch carved by the sea from soft and hard limestone ledges of the Antigua formation, St. Johns, Antigua, Leeward Islands, West Indies, Caribbean, Central America

Desert landscape with rock formations in Monument Valley, Arizona, United States of America, North America

White and pink sandstone ridges, White Pocket, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Red and white sandstone stripes at sunrise, Valley of Fire State Park, Nevada, United States of America, North America

Sandstone formations, White Pockets, Paria Plateau, Northern Arizona, United States of America, North America

Detail of wind and water erosion in the sandstone cliffs of the King George River, Koolama Bay, Kimberley, Western Australia, Australia, Pacific

Rock formation caused by erosion known as Delicate Arch, 45 ft high and 33 ft wide, in the Arches National Park in Utah, United States of America, North America

Sandstone formations with clouds, Coyote Buttes Wilderness, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Aerial view of the interior of the island of Kauai, including Waimea Canyon, Hawaii, United States of America, North America

Half Dome at sunset, Olmsted Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Rock formations at Sandwood Bay, with Am Buachaille sea stack in far distance, Sutherland, Scotland, United Kingdom, Europe

Red sandstone with three-dimensional erosion forms, Gold Butte, Nevada, United States of America, North America

Rock formations known as The Mittens on the Navajo Tribal Reservation in Monument Valley, on the Utah Arizona border, USA

Eroded rock pinnacles, Valle de la Luna (Valley of the Moon), Atacama Desert, Norte Grande, Chile, South America

Phallic pillars known as fairy chimneys in the valley known as Love Valley near Goreme in Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

White, tan, and red sandstone butte, White Pocket, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Hoodoos and snow lit by strong dawn light in winter, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Sandstone formations, White Pockets, Paria Plateau, Northern Arizona, United States of America, North America

Trees on limestone pavement, Ingleborough National Nature Reserve, Yorkshire Dales, North Yorkshire, England, United Kingdom, Europe

Taughannock Falls, Taughannock Falls State Park, Ithaca, New York State, United States of America, North America

Sipapu Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America

Taughannock Falls, Taughannock Falls State Park, Ithaca, New York State, United States of America, North America

Landscape with Green River in the Island in the Sky District of the Canyonlands National Park, in Utah, USA *** Local Caption ***

Erosion pattern in colorful dirt, Vermilion Cliffs National Monument, Arizona, United States of America, North America

The Pinnacles limestone formations at sunset in Nambung National Park, Western Australia, Australia, Pacific

The Pinnacles limestone formations at sunset contained within Nambung National Park, Western Australia, Australia, Pacific

The Pinnacles limestone formations at sunset in Nambung National Park, Western Australia, Australia, Pacific

Taughannock Falls, Taughannock Falls State Park, Ithaca, New York State, United States of America, North America

Taughannock Falls, Taughannock Falls State Park, Ithaca, New York State, United States of America, North America

The Three Judges at sunrise, Goblin Valley State Park, Utah, United States of America, North America

Sandstone cones at first light, Coyote Buttes Wilderness, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Aerial view of the interior of the island of Kauai, including Waimea Canyon, Hawaii, United States of America, North America

Rock formations, Needles District, Canyonlands National Park, Utah, United States of America, North America

View southeast from top of Sella Group to Passo Pordoi road in valley, Dolomites, Trentino-Alto Adige, Italy, Europe

Rocks and hoodoos lit by strong dawn light in winter, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America