Fossil clam

Fossil clam

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Credit: KAJ R. SVENSSON/SCIENCE PHOTO LIBRARY

Caption: Fossil clam, with a smaller fossil snail inside. Clams are a type of bivalve (two-shelled) marine mollusc. In a marine environment, a fossil is created when an animal is buried in sand or mud after death, and the normal decay processes do not occur. The minerals of the hard parts of the animal, in this case the shell, are gradually replaced with rock. This fossil was found in sandstone on the shoreline of the US Pacific coast in Oregon. Here, sandstone layers bearing various fossils are continually uplifted by the Pacific Plate as it strikes the North American Plate. As the sandstone layers reach the intertidal zone, the fossils are exposed by erosion.

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Keywords: 1, american, animal, biological, biology, bivalve, bivalvia, calcium carbonate, clam, conchology, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, fauna, fossil, fossilisation, fossilised, fossilization, fossilized, gastropod, gastropoda, historical, history, invertebrate, malacology, marine, marine biology, mollusc, mollusca, nature, north america, north american, one, oregon, pacific coast, palaeontological, palaeontology, palaeozoology, paleontological, paleontology, prehistoric, prehistory, sandstone, shell, shelled, shells, single, snail, still life, still-life, studio shot, united states, us, usa, white background, wildlife, zoological, zoology

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