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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.
Detail of a fossil Ichthyosaurus.
Ammonite fossils in limestone. The ammonites where living between 409 and 65 million years ago (Mya). The fossils where found in the canton of Aargau (Switzerland).
Trilobite fossil on stone, prehistoric extinct animal lived in Cambrian and Silurian seas. Big trilobite fossil of prehistoric era and rock. Concept of paleontology, evolution and Paleozoic fossil.
Small Insect fossil on stone
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
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.
fossil trilobite imprinted in the sediment
Fossils of marine life.Ammonite fossils
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).
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.
Petrified fossil crinoids (sea lilies, featherstars) in stone
Magnified close up of shale with multiple trilobite fossils.
Trilobites fossil from Middle Ordovician Era. Selective focus
Rudists embeded in sandstones, cross sections.\nCretaceous marine fossis near Barcelona.
isolated on black.
Fossilised Fish
The three sections of the Taung Child Skull as reconstructed by Raymond Dart. In 1924 miners at the Buxton Quarry near Taung in South Africa's North West Province discovered a fossil that was later identified by Dart as an Australopithecus africanus, the first discovery of its kind. His reconstruction consists of three separate parts: the mandible, the face, and an endocranial cast. Age: approximately 2,5 million years. Taung is part of the UNESCO Cradle of Humankind World Heritage Site.
Sea Urchin spine fossil.  The close-up image shows a  sea urchin fossil from the jurassic period inside a limestone.
Marine mammal bone (Cetacea) and other fossils outcrop on the beach at Capitola City Beach, California, USA.
Microscopic photo of a thin section of calcareous tufa of Holocene age.
Fossils of trilobite on rock background.
Natural material, such as a large stone with the imprint of a prehistoric creature, allowing the study of natural diversity during the dinosaur period and earlie
Fossilised Fish
A very old fossil of a prehistoric fish on a stone
Calmitacea inside a peace of stone. The fossil was growing in the Carboniferous Period (around 360 to 300 million years ago).
Trilobite fossil (Cheirurus ingricus) from the middle Ordovician peroid (488.3 – 443.7 million years ago) . This specimen was found in Russia
Myrmicinae, spiny ant (Hymenoptera) in Baltic amber, Eocene, approximately 56 - 34 million years ago. Image taken with extreme macro and focus stacking technique.
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