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How Fossils Are Formed and Preserved
How Old Are Fossils?An Explanation of Geologic
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abundant amateur ammonoids amphibians arthropods Austin bird body bones brachiopods Bureau of Economic calcareous Cambrian Cambrian to Recent Cenozoic cephalopods clams Class classification collecting collector contain corals Courtesy Cretaceous crinoids deposits Devonian dinosaurs early earth history echinoderms Economic Geology Eocene exoskeleton extinct feet long fish forms fossil record fossil-collecting fossiliferous fossils Fossils by W. H. gastropods Geologic Time Scale Geological Survey geologist Greek important as fossils invertebrate jaws Jurassic known large numbers limestones living lizards mammals marine Mesozoic microfossils mineral Mississippian modern mold mollusks Museum of Natural nautiloids Ordovician organisms paleontology Paleozoic pelecypods Pennsylvanian period Permian permission from Texas phylum plants and animals plaster Pleistocene Precambrian prehistoric preserved primitive published remains reptiles resemblance rocks sediments shales shell Silurian skeleton skull species specimens strata structures subclass teeth Tertiary Texas Fossils Triassic trilobites typical University of Texas usually valves vertebrate W. H. Matthews York