The U.S. Cordillera is typical of orogenic belts in its preservation of multiple episodes of extensional, strike-slip, and compressional deformation. Widespread, latest Proterozoic extension established an early Paleozoic passive margin (Stewart; 1972; Bond and Kominz, 1984). Other events, probably of lesser overall magnitude and extent, include mid-Proterozoic rifting in the Pacific Northwest, resulting in the accumulation of the Belt Supergroup, late Paleozoic rifting along the continental margin arc (Miller and others, 1984) and perhaps also within the craton and miogeocline (Kluth, 1986), and Mesozoic extensional tectonism in the “hinterland” of the Mesozoic fold...
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The Cordilleran Orogen
Six of the 17 chapters in this work comprise a series of time slices synthesizing the latest Proterozoic to the latest Devonian; late Paleozoic, early Mesozoic, Late Jurassic to early Cretaceous; late Cretaceous to early Eocene; and post-Laramide geologic and tectonic history. Ten topical chapters provide overviews of regional, extensional, strike-slip, and fold and thrust tectonics, magmatism, metamorphism, sedimentary assemblages, metallogenic evolution, ophiolites, and paleomagnetics. Accompanying plates, many in color, include a regional tectonostratigraphic map, a series of time-slice syntheses, specialized maps showing patterns of metamorphism and of crustal extension, and a balanced cross-section across the Cordilleran thrust belt.