CLASSIFIED KEY TO INDEX. 
Page. 
Alabama 19 
Alaska 20 
Archean and Algonkian 20 
General 20 
Correlation . 21 
Canada 21 
New England 21 
Appalachian region 21 
Great Lakes region 22 
Mississippi Valley region 23 
Ozark region 23 
Rocky Mountain region 23 
Great Basin region 23 
Arizona 23 
Arkansas 24 
Baffinland .' 25 
Bahama Islands 25 
Bermuda Islands 25 
Bibliography 25 
Biography 27 
California 27 
Cambrian 30 
General 30 
Nomenclature 30 
Canada 31 
New England and New York 31 
Appalachian region 31 
Great Lakes region 32 
Mississippi Valley and Ozark regions 33 
Rocky Mountain region 33 
Great Basin region 33 
Sierra Nevada and Pacific Coast region 33 
Mexico 33 
Canada 33 
General 33 
Alberta 35 
Athabasca 35 
British Columbia 35 
Keewatin 36 
Manitoba 36 
New Brunswick . 36 
Newfoundland 37 
Northwest Territory 37 
Nova Scotia 37 
11 
