Invertebrate Fossils |
Contents
THE NATURE OF FOSSILS Moore Fischer Lalicker | 1 |
Evolution of animals | 28 |
Fossilbearing rock divisions | 35 |
Copyright | |
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Common terms and phrases
ambulacral ammonoids animals anus aperture apical arthropods articulate attached autopores axial basal beak belonging body brachial interior brachial valve brachial views brachiopods branches bryozoans calcareous Cambrian carapace cephalon chambers characterized chitinous coiled colony Conrad corallite corals costae Cretaceous Cretaceous-Recent crinoids deposits developed dorsal echinoderms echinoids Eocene Eocene-Recent evolutionary faunas Foraminifera fossils gastropods genera genus Geol geologic gills grooves growth Hall heterodont hinge line interarea invertebrates Jurassic lamellae left valve lophophore Lower Devonian mantle cavity margin Middle Cambrian Middle Devonian Middle Ordovician Middle Silurian Miocene Mississippian mouth nautiloids North America Ordovician ostracodes outer pair Paleontology Paleozoic pedicle valve pelecypods Permian plates pores posterior pygidium radial Representative ridges right valve rocks segments septa septum shell side views Silurian siphuncle species spines spiral sponges structure suborder surface suture Texas theca tion transverse Triassic trilobites tubes Ulrich Upper Ordovician Upper Pennsylvanian ventral wall whorls