Life of the Past |
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acritarchs algae ammonoids amphibians angiosperms animals areas became extinct bones bony brachiopods bryozoans CALIFORNIA called Cambrian carnivores cells Cenozoic cephalopods changes climate coelom common cone conifers conspicuous contained corals Courtesy of Field Courtesy of National Cretaceous crust Devonian dinosaurs diverse dominant early earth Eocene ERSITY evolution evolutionary evolved fauna ferns Field Museum Figure fishes floras flowering plants formed fossil record gametophyte geologic graptolites gymnosperms habitats herbivores insects invertebrates Jurassic land plants LIBRARY living lophophore major groups mammals marine Mesozoic migration million Miocene molars Museum of Natural National Museum Natural History North America oceans Ordovician organisms paleontologists Paleozoic Pennsylvanian Permian phylum plant body Precambrian predators preserved primitive protists reefs reproductive SAN DIEGO sea floor sediment sedimentary rock seed shale shell skeleton skull South species specimen spores sporophyte stem structure teeth terrestrial tion tissues trees Triassic trilobites ungulates UNIV UNIVERSITY vascular plants vertebrate