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Devonian fossils in limestone matrix include bryozoa, crinoid, and brachiopod fossils. Largest pieces are about 1/2 inch (10 mm). Fossil and Prairie Park Preserve, Silos and Smokestacks National Heritage Area, Rockford, Iowa, USA.

CREEL, MEXICO - Jan 2016: A native Raramuri couple walks through the barren landscape of the Valley of the Monks in Creel, near the Copper Canyon in northern Mexico

A fossilized tree trunk from the UNESCO Geopark Petrified Forest of Sigri on the island of Lesvos in Greece. Mytilene - Greece Lesbos fossil forest

Paint Mines geological rock formations near in El Paso county, Calhan and Colorado Springs, Colorado, in western USA of North America. Named for the colorful clays that were collected by American Indians to make paint. Brightly colored bands, caused by oxidized iron compounds throughout the many different layers of clay.

Palo Duro Canyon State Park, Texas, USA: eroded cliff side - Geologic time periods marked by major changes in the fossil record - rock strata covering the Permian age, Triassic age, Miocene-Pliocene age and at the top the Quaternary age - this cliff includes the Permian-Triassic (P-T) extinction boundary, colloquially known as the Great Dying, that took place about 248 million years ago. The extinction was caused by climate change. The main cause of extinction was the vast amount of carbon dioxide emitted by volcanic eruptions that created the Siberian Traps, which elevated global temperatures and acidified the oceans. Geological time scale, part of the Caprock Escarpment - Texas Panhandle.

Big Stump, a petrified tree in Florissant Fossil Beds National Monument

Unusual spherical shape of stones in the Kazakh steppe Mangistau, valley of balls in nature Torysh

Cat sized, a tiny, swift fox skull looks out over his rocky home, his entire skeleton still remains at the base of the rocks in the Pawnee National Grassland in northern Colorado.

Healthy lifestyle age 20 - 55 Outdoor Experiences in Western USA Desert Colombian American Hispanic Female Friends on Outdoor Adventure Hiking, Playing in Snow and Adding to a Stacked Stone Cairn (Shot with Canon 5DS 50.6mp photos professionally retouched - Lightroom / Photoshop - original size 5792 x 8688 downsampled as needed for clarity and select focus used for dramatic effect)

Dinosaur bone fossils partly excavated in rock wall in Jensen, Utah, United States

Mangystau desert landmark, Kyzylkup area, Kazakhstan. Rock strata formations

Huge gold mine in central Colorado, western USA of North America.

Petrified dinosaur bones in the Dinosaur National Monument, Utah, USA.

The sun shines on the stone texture

Dinosaur National Monument

Mars Surface

A young woman studies the details in a Puebloan mask painted on a overhang in the desert landscape of Hueco Tanks State Park in Texas. The area is known for the pictograph masks from the Jornada Mogollon which were in the area from 450 to 1400 A.D.

Hills of chalk and limestone and slopes of multi-colored mountains with weathering and washouts from water, colored relief in the steppe

RaptorDinosaur track enclosure in sandstone layers at Dinosaur ridge

Badlands are a particular type of rock formation found in arid regions around the world. These formations require poorly consolidated rock and infrequent but torrential rain. The soft rock allows large quantities of water to channel down gullies, carrying away sediment. Bentonite clay within these formations can swell up with moisture. As the clay dries it shrinks and cracks, creating a surface resembling the skin of an elephant. Beneath the surface, an intricate maze of natural pipes and spaces form within the badlands. This hidden plumbing appears on the face of the badlands as dimples, sinks, slumps and seeps. As erosion continues, new features including caves and natural bridges can form. Badlands often take on varied colors giving the formations a banded appearance. These colorful badland formations were at Blue Mesa in Petrified Forest National Park near Holbrook, Arizona, USA.

Rock formations at the Ah-shi-sle-pah Wash, Wilderness Study Area, New Mexico

High dynamic range image of the beautiful landscape of the Canadian Badlands in Alberta, Canada.

Deposition of layers of geological material over thousands of years, cut away to make room for a highway.

Brachiopod fossil cast in ancient sandstone with orange lichens

Views of the Atacama Desert and the town

Gold mine in central Colorado in western USA of North America.

Giant petrified redwood stump in Florissant Fossil Beds National Monument

Summer landscape in Badlands National Park, South Dakota, USA

Dakota formation near Denver Colorado USA

$Soda Butte was named by the Washburn-Langford-Doane Expedition in 1870. The name \$

Free Images: "bestof:geology fossils fieldwork fossil beds excavation outdoor As Florissant Fossil Beds National Monument, Colorado, new visitor center took shape, Lindsay Walker"

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