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acritarchs algae ammonoids amphibians angiosperms animals areas became extinct bones bony brachiopods bryozoans called Cambrian carbon 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 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 leaves living lophophore major groups mammal-like reptiles mammalian mammals Mesozoic microscopic 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 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 vascular plants vertebrate