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CHAPTER VAQH I Historical Geology
A Living Record of the Dead
Evolution the Constant Change op Living Things
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abundant animals Appalachian basin belt body bones brachiopods Cambrian Canadian Shield Cenozoic clam climate coal Colorado continent corals Cordilleran Cretaceous deposits detrital developed Devonian dinosaurs dolomite early Earth east eastern Eocene epeiric seas epoch erosion Europe evidence evolution extensive extinct faunas feet thick folding formations fossils geologic geosyncline glacial Grand Canyon granitic Jurassic known Lake land plants Late later lava limestone Lower mammals marine Mesozoic Middle miles Miocene Mississippian modern mountains North America northern ocean Oligocene Ordovician orogeny Paleozoic Pennsylvanian period Permian Phylum plains Plateau Pleistocene Pliocene Pre-Cambrian present preserved primitive probably Proterozoic ranges record red beds reefs region represented reptiles River rocks Rocky sand sandstone sedimentary sediments shales shell Silurian skeleton South southern species spread strata streams structures surface tion Triassic trilobites trough types unconformity uplift Upper Valley vast volcanic western