6 CONTENTS. 



Chapter II — Continued. 



Montana 162 



Canadian extension - - - 



Paleontology 165 



Interior Continental Province !"■ 



Upper Mississippi area .--- - -- I'l 



Wisconsin 171 



Minnesota 181 



Iowa 187 



Lake Superior sandstone - - - 188 



Missouri - - 199 



Eastern border or Adirondack sub-Province - --. 201 



Canadian Extension 207 



Western Border or Rocky Mountain sub-Province 209 



Colorado 209 



Wyoming - - 211 



Dakota r 214 



Southwestern sub-Province 216 



Texas 216 



Arizona 219 



Paleontology 221 



Upper Mississippi area 221 



Red sandstone of Lake Superior 228 



Missouri _ 229 



Eastern border or Adirondack sub-Province 229 



Western border or Rocky Mountain sub-Province 233 



Texas 234 



Arizona 235 



Chapter III. Nomenclature employed in the description of the formations.. 236 



Cambrian 237 



Taconio 242 



Taconiau 243 



Primordial 243 



Potsdam 244 



St. Croix . 245 



Madison 245 



Mendota 245 



Tonto 245 



Hamburg 246 



Secret Canon 246 



Katemcy 1 246 



Riley 246 



Hickory 246 



Connasauga 246 



Montevallo 247 



Choccolocco 247 



Coosa 247 



Rome sandstone 247 



Bretonian ...._.. ...... 247 



Acadian ......... .... . 248 



St. John's _ 24g 



Johannian 249 



Georgia 049 



Granular Quartz 250 



