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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.
Old stones background. imprint of an ancient ammonite from the Mesozoic era.
An eroding rock with fossil inclusions surrounded by beach rock swash deposits.  These types of rocks are fairly common to find on NW USA beaches for those with a keen eye.
Ammonite inside a limestone rock. The ammonites where living between 409 and 65 million years ago (Mya). The image was captured in the canton of Aargau (Switzerland).
Block of brown and white fossil shells background
fossil of a trilobite. lived during time of Early Cambrian throughout the lower Paleozoic, during the Devonian til the end of the Permian See also my other Fossils and Mineral/ Crystal images:
Detail of a fossil Ichthyosaurus.
Rudists embeded in sandstones, cross sections.\nCretaceous marine fossis near Barcelona.
Knightia alta is an extinct genus of fish well-known from abundant fossils found in the Green River Formation of Wyoming, United States. They rarely exceeded 10 cm in length and are found throughout the formation. Knightia alta, Eocene Epoch, Green River Shale. Fossil.
Trilobites
Magnified close up of shale with multiple trilobite fossils.
Archaeopteryx marble imprint, fossilized imprint, imprint transitional form (mosaic form), of a theropod dinosaur. Replica of a lime-impression (limestone slab) from the Jurassic about 150 million years old.
Ancient fish fossils are on a rock
Trilobites fossil from Middle Ordovician Era. Selective focus
Fossilised Fish
isolated on black.
Fossil Fern inside carbon rocks. The image was captured in the Swiss Alps.
Microraptor gui fossil, Early Cretaceous.
Adventures in the Southwest USA, paleontologist at work
Keichousaurus hui sauropterygian fossil from China
close up on fish fossil fish in the rock
Marine mammal bone (Cetacea) and other fossils outcrop on the beach at Capitola City Beach, California, USA.
Ammonite fossil imprint on prehistoric rocks
Ammonite and Orthoceras Fossil preserved in the rocks mined from the reserve found in the Middle Atlas Mountains of Morocco
Isolated on white.
Fossils of marine life.Ammonite fossils
A fossil of a germanodactyl in a stone slab
Fossils in the rock in the Sierra de Francia, Salamanca
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