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FOSSILS AND ROCKS
FOSSILS AS LIVING THINGS
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abundant adaptation Agnatha ammonites ancestors ancient animals and plants aquatic biocenose bones brachiopods called Cambrian Carboniferous carnivores Cenozoic Chapter characters Chondrichthyes Class classification common complex convergence corals correlation deposited Devonian dinosaurs early earth ecological environment Eocene evidence evolution evolutionary evolved example fact faunas feet fishes forms fossil record genetics geological geologists group of organisms herbivorous horse ichthyosaurs inches insects instance jaws Jurassic known land late Cretaceous later less living mammals marine middle million Miocene natural selection Neotropical North America occur Oligocene Ordovician orthogenesis Paleocene paleontologists Paleozoic Permian phyla Phylum placoderms plants and animals Pliocene populations pre-Cambrian present preserved primitive probably recent reef regions relationships relatively reptiles resemblance restored rodents role sandstone sedimentary rocks sediments separate sequence shells Silurian similar skeletons sorts South species strata teeth theory tion trends Triassic Triceratops true usually varied vertebrates whole zone