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Fossil logs 200 million years old scattered over desert floor in National Park, Petrified Forest National Park, Arizona, United States of America (U.S.A.), North America

Blue Mesa, Petrified Forest National Park, Arizona, United States of America (U.S.A.), North America

Coloured bands and ridges on the Blue Mesa in the Petrified Forest National Park in Arizona, United States of America, North America

View of Botha's Hall in the Cango Caves near Oudtshoorn in South Africa's Western Cape Province. To the left of centre is the Double Petrified column, in the centre is the Leaning Tower of Pisa and behind that is the Petrified Weeping Willow. On the right are the Frozen Victoria Falls.

The Petrified Dunes in Arches National Park with the snow-capped La Sal Mountains behind. Moab, Utah.

Snow on the Petrified Dunes in winter with the La Sal Mountains in the clouds behind. Arches National Park, Moab, Utah.

Snow-covered volcanic landscape with volcanic sand and petrified lava, crater of Askja volcano, Icelandic highlands, Iceland, Europe

USA, United States of America, Arizona: Petrified Forest National Park. Park with bizarre erosion landscape, Painted Desert area and petrified trees.. Navajo Indian Reservation.

USA, United States of America, Arizona: Petrified Forest National Park. Park with bizarre erosion landscape, Painted Desert area and petrified trees.. Navajo Indian Reservation.

Devil's Thumb, Palette Spring Street, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, petrified trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of Am

Fossilized ray-finned fish (Lepidotes maximus), Museum fuer Naturkunde, Natural History Museum, Berlin, Germany, Europe

Stone Virgins, Eselsburg Valley near Herbrechtingen, Swabian Alb, Baden-Wuerttemberg, Germany, Europe

Reynisdrangar group of rocks near Vik i MËrdal with Skessudrangur, Laddrangur and Langhamar rock formations, according to legend, three petrified trolls, south coast, Iceland, Europe

Ammonite fossil, beach, Nash Point, Glamorgan Heritage Coast, South Wales, Wales, United Kingdom, Europe

Devil's Thumb, Palette Spring Street, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, petrified trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of Am

Sand dunes turned into rock, sandstone formations, Coyote Buttes North, Paria Canyon-Vermilion Cliffs Wilderness, Page, Arizona, USA

Devil's Thumb, Palette Spring Street, Lower Terraces, limestone sinter terraces, geysers, hot springs, colorful thermophilic bacteria, microorganisms, petrified trees, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of Am

Stone Virgins, Eselsburg Valley near Herbrechtingen, Swabian Alb, Baden-Wuerttemberg, Germany, Europe

Fossils of a fern, 35-40 million years, on Longyearbreen Glacier, Longyeardalen, Adventfjorden, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

Petrified tree, runoff area of the Grand Prismatic Spring, Midway Geyser Basin, colored thermophilic bacteria, microorganisms, hot springs, Yellowstone National Park, Wyoming, United States of America, USA

Petrified tree in New Blue Spring Terrace, limestone sinter terraces, steaming geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

Sulfur vapor, petrified trees in New Blue Spring Road, limestone sinter terraces, steaming geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America

Petrified trees in New Blue Spring Terrace, limestone sinter terraces, steaming geysers, hot springs, Mammoth Hot Springs Terraces in Yellowstone National Park, Wyoming, United States of America, USA

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