IV CONTENTS. 



Pago. 

 Eeport of Arch. R. Marvine — Continued. 



Chapter III. The metamorphic crystalline rocks of the mountains 137 



The stratigraphy of the east slope of the Front range 144 



Chapter IV. The Middle Park - 154 



The Cretaceous formation of the Middle Park 154 



Doleritic breccia 156 



The Lignitic formation of the park 156 



Lake-beds of the Middle Park^ 157 



Glacial 157 



The valley of the Upper Grand 158 



The Frazier basin - 161 



The region in the vicinity of the Hot Springs .' 162 



Section of Cretaceous No. 1, near junction of Hot Springs and Grand Lake 



roads, entrance of Middle Park - 163 



Section of Cretaceous No. 1 at the mouth of the Frazier Canon 164 



The nonconformity at the Hot Springs, Middle Park 167 



William's River Valley 170 



The northern Lignitic area 171 



Lower Troublesome Valley 176 



Valley of the Lower Grand 176 



The valley of the Muddy :, 178 



The valley of the Blue Biver 184 



The Park range and Blue River Mountains 187 



The Blue River or Mount Powell group 188 



The southern end of the William's River range .• 189 



Report of A. C. Peale, M. D., Geologist of the South Park division 193 



Chapter I. From Denver to Colorado Sx)rings — Front range — Bergen Park — 



HaydenPark 194 



Chapter II. South Park — Park range 212 



Chapter III. Arkansas Valley — Eagle River — Sawatch range 239 



Chapter IV. Gunnison River — Elk Mountains — Roaring Fork 247 



No. 1. — Catalogue of minerals 267 



No. 2. — Catalogue of rocks , 270 



Eeport of. F. M. Endlich, S. N. D., [geologist of the San Luis division ] 275 



Chapter I. Preliminary report upon the mining-districts of Colorado 276 



Formation of veins and lodes 278 



Search for lodes 279 



Mines noted by the South Park division of the United States geological 



survey, 1873, by A. C. Peale 301 



Tarryali Creek . ' ,. 301 



Silver Heels Mountain 302 



Fair Play, Colorado 302 



OroCity 303 



Homestake lode, »&.c 303 



Arkansas Valley 304 



Elk Mountain district 304 



Chapter II. Report upon the geology of the San Luis district [section A.].. 305 



Chapter III. Geology of section B, San Luis division 323 



Chapter IV. Geology of section C, San Luis division 335 



Conclusion 348 



Appendix. Mineralogical notes and a catalogue of the minerals of Colorado 



Territory 352 



Mineralogical notes 352 



Catalogue of the minerals of Colorado Territory 355 



PART II.-SPECIAL REPORTS ON PALEONTOLOGY. 



The Lignitic formation and its fossil flora, by Leo Lesquereux 365 



Introduction 366 



$ 1. Age of the North American Lignitic 3C7 



§ 2. Distribution of the fossil plants in the different groups of the Tertiary.. 378 



List of the species of the first group : 379 



Remarks on the species of the first group 383 



List of the species of the second group 384 



Remarks on the species of the second group 386 



List of the species of the third group 386 



Remarks on the species of the third 'group 387 



List of the species of the fourth group 388 



