Vlll 



CONTENTS 



39. ALASKA AND THE YUKON 605 



Geomorphic Provinces of Alaska Paleozoic Geosyncline and Related 

 Orogeny Triassic and Jurassic Geanticline and Adjacent Basins 

 Cretaceous Basins and Geanticlines Mesozoic and Cenozoic Oro- 

 genies Tertiary Volcanic Rocks Aleutian Volcanic Belt Siberian 

 Tectonic Connections Yukon Territory and the District of Mackenzie 

 Cenozoic Trenches and Faults 



40. CANADIAN ARCTIC 633 



Geography and Geologic Provinces of the Arctic Archipelago Low- 

 lands and Plateaus Fold Belts— The Innuitian Region Arctic Coastal 

 Plain Correlation with Alaska and the Yukon Pleistocene Epeirog- 

 eny and Climatic Changes Orogenic Belts of Greenland Arctic 

 Ocean Basin 



41. GULF COASTAL PLAIN 



General Characteristics Structural Geology Igneous Rocks Tam- 

 pico Region, Mexico Florida Platform Crustal Structure of Gulf 

 of Mexico 



650 



42. ANTILLEAN-CARIBBEAN REGION 670 



Geographic Provinces Greater Antilles Lesser Antilles Puerto 

 Rico Trench and Gravity Anomalies Caribbean Region and Seismic 

 Profiles Origin of the Caribbean Basins, Trenches, and Rises Pos- 

 tulated Eastward Shift of Caribbean Block 



43. SOUTHERN MEXICO AND CENTRAL AMERICA 696 



Major Geologic Divisions Crystalline Belt Permian Fold Belt Late 

 Cretaceous and Early Tertiary Fold Belt Southern Gulf Coastal 

 Plain Yucatan Peninsula Volcanic Fields and Faulting Isthmian 

 Volcanic Link Relation to Greater Antilles Mammalian Fossil Record 

 and Land Connections 



BIBLIOGRAPHY 709 



INDEX 739 



