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CAPTER PAGI XVII MATTER AND ORGANISMS
EVOLUTION THE CONSTANT CHANGE OF LIVING THINGS
FOSSILS THE GE0LOGISTS TIME MARKERS
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abundant Acadian Amphibia animals Appalachian appear Archeozoic attained basin bivalves brachiopods calcareous Cambrian carbon Carboniferous cent chapter climate close coal beds Comanchian continent corals Cordilleran Cretaceous crinids Deﬁnition developed Devonian dinosaurs dorsal earth eastern Eocene epeiric seas erosion Europe eurypterids evolution faunas feet thick ferns ﬁeld ﬁn ﬁnally ﬁrst ﬁshes ﬁve ﬂood ﬂora ﬂow ﬂowers folded formations forms fossils fresh-water gastropods geologic geologists gills glacial inches invertebrates Jurassic known Lake land later less lime limestone living Lower lung-ﬁshes mammals marine Mesozoic Middle miles Miocene Mountains nearly North America northern occur oceans Old Red Ordovician organic origin ostracoderms Paciﬁc Paleozoic Pennsylvanian period Permian plants plates Pleistocene present probably Proterozoic region reptiles rivers rocks sand sandstones sediments seen shales sharks shells signiﬁcance Silurian skeletons southern species Stegocephalia strata structure surface teeth Tertiary tion Triassic trilobites Upper Devonian vertebrates volcanic western zones