CLASSIFIED KEY TO INDEX 15 
Page. 
Juratrias - 121 
General 121 
Correlation 122 
Nomenclature 122 
Canada 122 
Alaska 122 
Atlantic Coastal Plain 122 
Southwestern region 122 
Great Plains region 122 
Rocky Mountain region 122 
Sierra Nevada and Pacific Coast region 123 
Mexico 123 
Kansas 123 
Kentucky 125 
Labrador ^ 126 
Louisiana 126 
Maine 126 
Maryland 126 
Massachusetts 127 
Mexico 128 
Michigan 129 
Mineralogy 130 
Minerals described 134 
Minnesota 137 
Mississippi 1 39 
Missouri 139 
Montana 140 
Nebraska 142 
Nevada 142 
Newfoundland 142 
New Hampshire 142 
New Jersey 143 
New Mexico 144 
New York 145 
Nicaragua 149 
Nomenclature , 149 
North Carolina 149 
North Dakota 150 
Ohio 150 
Oklahoma 151 
Oregon 151 
Paleontology 151 
Algonkian 151 
Cambrian 151 
Silurian 152 
Devonian 154 
Carboniferous (including Permian ) 156 
Juratrias 157 
Cretaceous 158 
Tertiary 161 
Eocene . . 162 
Miocene 163 
Pliocene 163 
