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Islands of Rock in Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A narrow slot canyon of bentonite on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A dry waterfall on the west side of Hamilili Point, Hamilili being a Zuni word for petrified wood, next to a hoodoo on the south end of Petrified Forest National Park, Arizona, United States of America, North America

A small bentonite arch in Goblin Garden west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

A purple canyon with a dry creek in between hills of bentonite in Petrified Forest National Park, Arizona, United States of America, North America

Ruined Kasbah on a hill, a former Berbers' house built of adobe, mountain range of the Djebel Kissane table mountain at the back, Draa Valley, southern Morocco, Morocco, Africa

Earth pyramids, spring, Lengmoos, Mittelberg am Ritten, near Bolzano, Dolomites, South Tyrol, Italy, Europe

The Pan American Highway is an empty, lonely, desolate road as it runs along Peru's Pacific Desert Coast along the ocean for hundreds of miles, Near Chala, Peru

Monk and Eroded hills of sedimentary conglomerate and sandstone, Unesco World Heritage, Zhangye, China

Tourist in Eroded hills of sedimentary conglomerate and sandstone, Unesco World Heritage, Zhangye, China

Landscape of tropical karstic phenomena in the Tsingy national park of Bemaraha, Small Tsingy area, UNESCO World Heritage site, Early November: end of dry season, Madagascar

Landscape of tropical karstic phenomena in the Tsingy national park of Bemaraha, Small Tsingy area, UNESCO World Heritage site, Early November: end of dry season, Madagascar

Landscape of tropical karstic phenomena in the Tsingy national park of Bemaraha, Small Tsingy area, UNESCO World Heritage site, Early November: end of dry season, Madagascar

Landscape of tropical karstic phenomena in the Tsingy national park of Bemaraha, Small Tsingy area, UNESCO World Heritage site, Early November: end of dry season, Madagascar

Landscape of tropical karstic phenomena in the Tsingy national park of Bemaraha, Small Tsingy area, UNESCO World Heritage site, Early November: end of dry season, Madagascar

Remarkable flysch formations of Deba, Basque Coast Geopark, Basque Country, Spain. Flysch formed at the end of the Mesozoic era in the Cretaceous - flyschs are formed by sediment accumulation following repeated submarine avalanches, due to earthquakes, and producing after compaction and crystallization very regular layers of sandstone and limestone here recovered by Pyrenean orogeny and released by erosion.

Remarkable flysch formations of Deba, Basque Coast Geopark, Basque Country, Spain. Flysch formed at the end of the Mesozoic era in the Cretaceous - flyschs are formed by sediment accumulation following repeated submarine avalanches, due to earthquakes, and producing after compaction and crystallization very regular layers of sandstone and limestone here recovered by Pyrenean orogeny and released by erosion.

First light from the cliffs of etretat, Porte d'Aval, Cote d'Albâtre, Seine-Maritime, Normandy, France

Antelope Canyon. The Upper Antelope Canyon, 2 to 3 m wide and 400 m long, managed by the Navajo Indian tribe, Arizona, USA.

The Upper Antelope Canyon, 2 to 3 m wide and 400 m long, managed by the Navajo Indian tribe. Antelope Canyon. Arizona. USA.

USA. Arizona. Petrified Forest National Park encompasses the Painted Desert known for its colorful lands.

The city of Sedona is known for its natural red sandstone formations such as Cathedral Rock here. Arizona. USA.

USA. Arizona. The city of Sedona is known for its natural red sandstone formations such as Cathedral Rock here.

Alignment of wooden piles planted in the sand to disperse the energy of the swell and favor the return of sediments, winter, Opal Coast, France

Tourist photograph, Eroded hills of sedimentary conglomerate and sandstone, Unesco World Heritage, Zhangye, China

The Petrified Forest National Park is home to thousands of fossilized tree trunks approximately 200 million years old (Triassic period). Arizona. USA.

Landscape of tropical karstic phenomena in the Tsingy national park of Bemaraha, Small Tsingy area, UNESCO World Heritage site, Early November: end of dry season, Madagascar

Landscape in fjord Alftafjoerdur. The Westfjords (Vestfirdir) in Iceland during autumn. Europe, Northern Europe, Iceland

Les Terres Noires de Robine sur Galabre under the snow. Jurassic (Toarcian) marls rich in organic matter, tender and very sensitive to gullying, colonized mainly by Scots pines and forming remarkable reliefs in the Digne Geological Reserve, Alpes de Haute Provence, France.

Waterfall Sellfoss in the Vatnajoekull NP. Sellfoss is the first of several waterfalls of river Joekulsa a Fjoellum in the canyon Joekulsargljufur. Europe, Northern Europe, Iceland

Les Terres Noires de Robine sur Galabre under the snow. Jurassic (Toarcian) marls rich in organic matter, tender and very sensitive to gullying, colonized mainly by Scots pines and forming remarkable reliefs in the Digne Geological Reserve, Alpes de Haute Provence, France.

Les Terres Noires de Robine sur Galabre under the snow. Jurassic (Toarcian) marls rich in organic matter, tender and very sensitive to gullying, colonized mainly by Scots pines and forming remarkable reliefs in the Digne Geological Reserve, Alpes de Haute Provence, France.

Canyon Joekulsargljufur and river Joekulsa a Fjoellum with waterfall Hafragilsfoss in Vatnajoekull NP. Europe, Northern Europe, Iceland