12 CLASSIFIED KEY TO INDEX. 
Canada — Continued. 
Ontario 
Prince Edward Island 
Quebec 
Carboniferous (including Permian) 
General 
Correlation 
Classification and nomenclature 
Alaska 
Canada 
New England and New York 
Appalachian region 
Great Lakes region 
Mississippi Valley region 
Southwestern region 
Great Plains region 
Rocky Mountain region 
Great Basin region 
Sierra Nevada and Pacific Coast region 
Central America 
Mexico 
Yucatan 
Chemical analyses 
Classification 
Colorado 
Connecticut 
Correlation 
Costa Rica 
Cretaceous 
General 
Classification 
Correlation 
Nomenclature 
Alaska 
Canada 
Appalachian region 
Atlantic Coastal Plain 
Great Lakes region 
Mississippi Valley region 
Great Plains region 
Southwestern region 
Rocky Mountain region 
Great Basin region 
Sierra Nevada and Pacific Coast region 
Mexico and Central American region . . . 
Greenland 
Jamaica 
Cuba 
Delaware 
Devonian 
General 
Nomenclature and classification 
Correlation 
Alaska 
