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Continents Adrift Continents Aground
Evolution of a Concept
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abundant ancient animals Appalachian Archean areas beds belt boundary Cambrian Canyon carbonate Cenozoic changes Chapter classiﬁcation clastic climatic complex continents Cordilleran correlation craton Cretaceous crust cycle deﬁned deposits Devonian dinosaurs diversity early Earth environments evidence evolution evolutionary extinct facies fault fauna ﬁeld Figure ﬁrst formation formed fossil record geologic geologists glacial groups igneous inﬂuenced Iohn Iurassic Late layers limestone lithosphere major mammals Mesozoic million years ago mineral miogeoclinal modem molluscs Mountains North America occurred ocean basins Ordovician organisms origin orogeny Paciﬁc Paleogene Paleontologists Paleozoic pattems Permian Phanerozoic Photo Phylum plants plate tectonics Pleistocene Precambrian produced Proterozoic radiation radiometric radiometric dating reef reﬂect region represent Reproduced by permission reptiles sandstone scale scientiﬁc seaﬂoor sedimentary rocks sediments sequence shale shell signiﬁcant species strata stratigraphic stromatolites structures subduction surface taxa terranes tion trace fossils Triassic trilobites units vertebrates volcanic westem zone