16 CLASSIFIED KEY TO THE INDEX. 
Page. 
Cretaceous 93 
Canada 93 
Atlantic Coastal plain 93 
Mississippi Valley 93 
Gulf of Mexico region 93 
Mexico 93 
Grea t Plains region 93 
Rocky Mountain region 93 
Sierra Nevada and Pacific Coast region 93 
Miscellaneous 93 
Cuba 93 
Delaware 93 
Devonian 94 
Canada 94 
Appalachian region 91 
Great Lakes region 94 
Mississippi Valley 94 
Great Basin region 94 
Sierra Nevada and Pacific Coast region 94 
District of Columbia 94 
Dynamic Geology 94 
Economic Geology 95 
Alabama 95 
Alaska 95 
Arizona 95 
Arkansas 95 
California 95 
Canada 95 
Colorado 95 
Cuba 95 
Delaware 95 
Georgia 95 
Idaho 95 
Illinois 95 
Indiana 95 
Indian Territory 95 
Iowa 95 
Kansas 96 
Maine 96 
Maryland 96 
Mexico 96 
Michigan 96 
Missouri 96 
Montana 96 
Nebraska 96 
Nevada 96 
New Hampshire 96 
New Jersey 96 
New Mexico 96 
New York 96 
North Carolina 96 
Ohio 96 
Pennsylvania 96 
South Carolina 96 
South Dakota 96 
