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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.
In the petrified bed of a river in San Juan Raya, within the Tehuacan-Cuicatlan Biosphere Reserve, state of Puebla, the petrified footprints of dinosaurs that lived here in the Jurassic were found, specifically these of carnivorous theropods. They are marked with river stones to be able to identify them.
American Indian Arrowhead/Spear Point Artifact in Palm of Hand
The stalactites are in wooden trays in an exhibition hall
Rudists embeded in sandstones, cross sections.\nCretaceous marine fossis near Barcelona.
Cenomanian aMmonite occurs on the surface of limestone, Vergons, SE France.
Unique underground geology of  stalactites and stalagmites.
Fossileazed paw of Oviraptor found in Gobi deserd Mongolia
Natural salt stalactites crystals at the Dead Sea, lowest point on earth
Salt formations on the stones of Garmasr salt cave in Iran
Shark Tooth
Beautiful nature background.
Isolated on white.
Calmitacea inside a peace of stone. The fossil was growing in the Carboniferous Period (around 360 to 300 million years ago).
Rock Formation at Historic Mineral Springs at Alum Rock Park. San Jose, California, USA.
Flint nodule with mussel inclusion. Fossil. on white isolated background
Pha Chor canyon in Maewang National Park, Chiang Mai
Barnacles along the rugged shoreline along the west coast of Vancouver Island.
Beautiful view of Quadirikiri Caves of Arikok National Park of Aruba.
Marine mammal bone (Cetacea) and other fossils outcrop on the beach at Capitola City Beach, California, USA.
Empty shutters of the sessile crustacean Balanus sp.
Photo of a Columbian mammoth fossil at Waco Mammoth National Monument in Texas USA.
Bouquet of aragonite, Gouffre Géant de Cabrespine, Giant chasm of Cabrespine
Bivalvia Fossils inside a large Ammonit. Gastropods from the jurassic period.
Very old cave with beautiful speleothemes inside
Natural ecology, stone, rust, texture, background, abstract, plain stone, rock, building material, shape, solid, marble, granite, sea stone, wall, floor, stone wall, color, nature, simplicity
Texture of ancient coral reef in Egypt, background
Quartz in Ammonit
Limestone formations inside the Horne Lake Caves on Vancouver Island, British Columbia.
Landscape at Bisti Southern Section, Farmington, New Mexico, USA
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