CONTENTS, 



rage. 



Introduction 7 



Bibliography ]0 



Resum^ of literature and classification of areas 27 



Uinta Mountain region 28 



Grand River region -il 



Elk Mountain region i;9 



South Park region 78 



Sangre de Cristo region '. 83 



Front Range region 97 



San Juan region 122 



Dolores River region 132 



Recapitulation of Paleozoic formations 139 



Cambrian 140 



Ordo vician 147 



Silurian 1 156 



Devonian? ■ " 156 



Devonian. 161 



Carboniferous 162 



Mississippian 162 



Pennsylvanian 170 



' Faunal evidence and correlation 217 



ilississippian 217 



San Juan region 218 



Crested Butte iiuadrangle. 219 



Aspen district 220 



Leadville region . 221 



Salida , 224 



Canyon 224 



Pikes Peak ciuadrangle 225 



Perry Park 226 



Larimer County 226 



Summary 228 



Pennsylvanian 231 



Uinta ^Mountain region 231 



Grand River region 232 



Elk Mountain region 235 



South Park region 239 



3 



