Life of the Past |
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Page 36
... ( Courtesy of Field Museum of Natural History , Chicago . ) may be dissolved after they have been buried , and the vacant spaces may or may not later become filled with foreign material . Crystals may form in the spaces or mud may be ...
... ( Courtesy of Field Museum of Natural History , Chicago . ) may be dissolved after they have been buried , and the vacant spaces may or may not later become filled with foreign material . Crystals may form in the spaces or mud may be ...
Page 205
... ( Courtesy of Field Museum of Natural History , Chicago . ) FIGURE 14-9 . A branch of a sphenopsid , Annularia , preserved in an ironstone nodule of Pennsylvanian age from Illinois . The stem is divided into segments , with a whorl of ...
... ( Courtesy of Field Museum of Natural History , Chicago . ) FIGURE 14-9 . A branch of a sphenopsid , Annularia , preserved in an ironstone nodule of Pennsylvanian age from Illinois . The stem is divided into segments , with a whorl of ...
Page 207
... ( Courtesy of Field Museum of Natural His- tory , Chicago . ) FIGURE 14-12 . Leaflets from a seed fern , Neuropteris , of Pennsylvanian age from Illinois , preserved in an ironstone nodule . ( Courtesy of Field Museum of Natural History ...
... ( Courtesy of Field Museum of Natural His- tory , Chicago . ) FIGURE 14-12 . Leaflets from a seed fern , Neuropteris , of Pennsylvanian age from Illinois , preserved in an ironstone nodule . ( Courtesy of Field Museum of Natural History ...
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Common terms and phrases
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