VI 



CONTENTS 



12. MARITIME APPALACHIANS 189 



Definition Geomorphic Provinces Stratigraphy Igneous Rocks 

 Structures Tectonic History 



13. NEWFOUNDLAND APPALACHIANS 203 



Physical Divisions Stratigraphy Intrusions Major Structural Divi- 

 sions and Their Characteristics Tectonic History Major Tectonic Re- 

 lations of Greater Acadia 



14. OUACHITA, MARATHON, AND COAHUILA SYSTEMS 223 



Ouachita System Marathon System Coahuila System 



15. WICHITA AND ANCESTRAL ROCKIES SYSTEMS 



AND THE TEXAS FORELAND 237 



Wichita System Texas Foreland Ancestral Rockies System 



16. THE LATE PALEOZOIC ZONES OF FAULTING AND 

 CRYPTOVOLCANIC OR METEORITE IMPACT STRUCTURES 253 



Foreland Arcuate Fault Zone Lake Superior Fault Zone Cryptovol- 

 canic or Meteorite Impact Structures 



17. MESOZOIC SYSTEMS ALONG THE PACIFIC 260 



Western Nevada Northwestern Nevada Central and Northern 

 California Oregon Southern California Nevadan Orogeny An- 

 cestral Coast Range System Columbia System 



18. ROCKY MOUNTAINS IN MESOZOIC TIME 291 



Triassic Geography Early Jurassic Geography Early and Mid-Cre- 

 taceous Orogeny 



19. LATE CRETACEOUS AND EARLY TERTIARY ROCKY MOUNTAIN 

 SYSTEMS-THE LARAMIDE OROGENY 295 



Definition of Laramide Orogeny Belts of Deformation Relation of 

 Belts of Deformation to Crustal Constitution 



20. CANADIAN AND MONTANA ROCKIES 302 



Major Systems of Canadian Cordillera Divisions of Canadian and 



Montana Rockies Mountain Belt Foothill Belt Age of Thrusting 

 The Rocky Mountain Trench 



21. IDAHO BATHOLITH AND THE OSBURN FAULT ZONE 319 



Extent Composition Age Conclusions 



22. CENTRAL ROCKIES 327 



Spatial Relations Orogenic Deposits Southwestern Montana 

 Southeastern Idaho and Western Wyoming Wasatch Area of Utah 

 Central Utah Southwestern Utah Western Utah Southern Nevada 



23. CENTRAL MONTANA ROCKIES 351 



General Features Central Zone of Uplifts Zones of En Echelon 

 Faults Stages of Orogeny Igneous Centers Structures of the 

 Northern Great Plains 



24. WYOMING ROCKIES 361 



General Characteristics Teton— Gros Ventre— Wind River Element 

 Beartooth Range Owl Creek and Washakie Mountains Heart 

 Mountain and Related Features Absaroka Range and Yellowstone 

 Park Big Horn Range and Big Horn Basin Black Hills and Powder 

 River Basin Sweetwater Range Wind River Basin Hanna Basin 

 Late Tertiary Downfaulting of Sweetwater Range Laramide Pattern 

 and Cenozoic Stages in the Sweetwater Range Region Rawlins Up- 

 lift Washakie Basin Green River Basin Uinta Mountains Rock 

 Springs Uplift Laramie Range and Basin and Medicine Bow Range 

 Hartville Uplift Regional Uplift in Late Cenozoic 



25. COLORADO AND NEW MEXICO ROCKIES 389 



Extent of Laramide Deformation Colorado Rockies New Mexico 

 Rockies Central New Mexico Porphyry Belt Guadalupe and Mara- 

 thon Uplifts 



26. COLORADO PLATEAU 407 



General Geology Asymmetrical Arches and Basins Salt Anticlines 

 Laccolithic Mountains Upheaval Dome Volcanic Fields High Pla- 

 teaus of Utah Age of Uplifts and Volcanism Epeirogenic Move- 

 ments and Isostatic and Seismic Considerations 



