CONTENTS. 



GEOLOGY OF THE BLACK HILLS, BY HENRY NEWTON. 



Page. 



Chapter I. — Introduction 1 



II.— Observations on the Routes to and from the Black Hills 22 



ILL— Geology 38 



Section I. Introduction 38 



II. The Archaean 45 



III. The Granites 65 



IV. TheSilurian 80 



V. The Carboniferous 107 



VI. TheRedBeds 131 



VII. The Jura 151 



VIII. The Cretaceous 169 



IX. The Tertiary 186 



X. The volcanic rocks and volcanic peaks 189 



XL Structure and age of the Black Hills 203 



MINERAL RESOURCES OF THE BLACK HILLS, BY WALTER P. JENNEY. 



Chapter IV. — Mineral Resources 225 



Section I. Introduction 225 



II. The French Creek district 226 



III. Spring Creek district 238 



Whiskey Creek 259 



IV. Castle and Rapid Creeks 261 



The Castle Creek district 261 



Rapid Creek 267 



V. Box Elder and Elk Creeks 272 



VI. Spearfish and Bear Butte Creeks 277 



VII. The Bear Lodge country 283 



VIII. Deposits of auriferous gravels in the foothills 289 



IX. Conclusion 294 



Chapter V. — Climate and Resources 301 



Section I. Climate 301 



H. Watersupply 311 



HI. Soil 313 



IV. Wildfruits 315 



V. Grazing 317 



VI. Timher 320 



XIII 



