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Objects indicating the former presence of organisms
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abundant adductor adult algae ambulacral animal anus aperture attached beak blood body bones brachial valve brachiopods calcareous calyx Cambrian canal carbon cavity cells chitinous colony coral corallites Cretaceous crustaceans deposits Derivation of name Devonian digestive dorsal entire Eocene example external ferns forms fossil gametophyte gastropods genera genus geologic range gills grooves growth inclosed Jurassic layer lime limestone living lobes lophophore lower mammals mantle marine Miocene mollusks mouth muscles name from Greek nerve North America Oligocene opening Ordovician organs pair Paleozoic pedicle pedicle valve pelecypods Pennsylvanian Permian phylum plants plates Pleistocene polyp portion posterior present preserved primitive probably pygidium radiating reproduction reptiles respiration rock-builders secreted segments septa shell showing side view silica Silurian siphon siphuncle skeleton Sketch species spicules sponges starfish stem subclass surface sutures teeth tentacles Tertiary thallophytes Triassic trilobites tube Upper usually ventral vertebrates whence the name