136 CLASSIFIED KEY TO THE INDEX. [bull. 4 
PagS 
Carboniferous 1-1 
Appalachian region 14 
Canada 14 
Great Basin region 14 
Great Lakes region 14 
Great Plains region 14 
Mississippi Valley region 14 
New England and New York 14 
Ohio Valley region 14 
Rocky Mountain region U 
Southwestern region 1 - 
General . 14 1 
Cartography I 1 
Chemical analyses 1^ 
Classification 11 
Colorado 19 
Connecticut 1 - c 
Correlation 1 - 
Cretaceous 11 
Alaska 11 
Atlantic coast region 1; 
Canada 1 - 
Great Basin region _ 11 
Great Plains region li 
Gulf region 
Mexico 
M ississippi Valley region 
1 'acific coast region , 
Rocky Mountain region 
Si .nth western region 
Delaware 
Devonian 
Alaska 
Appalachian region 
Canada 
Great Basin region 
Mississippi Valley region 
New England and New York 1 
Ohio Valley regit >n 1 
Rocky Mountain region 1 
Southwestern region 1 
General 1 
Dynamic and struetural geology (geographic divisions) 1 
Alaska 1 
A ppalachian region 1 
Atlantic coast region 1 
Canada 1 
Central America I ' 
Great Basin region 1 ' 
Great Plains region I ' 
( rreenland 1 ' 
Great Lakes region 1 >' 
Hawaiian Islands ' ' 
