CONTENTS. 



GEOLOGY OF THE BLACK HILLS, BY HENRY NEWTON. 



Pago. 



Chapter I. — Introduction 1 



II.— Obsekvations on the Koutes to and from tue Black Hills 22 



III. — Geology 38 



Section I. lutroduction 38 



II. The Archa-an 45 



III. The Grauites 65 



IV. The Sihiiiau 80 



V. The Carboniferous 107 



VL The Red Beds 131 



VII. The Jura L.l 



VIII. The Cretaceous 169 



IX. The Tertiary Iri6 



X. The volcanic rocks and volcanic peaks 189 



XI. 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 



IL The French Creek district 226 



in. Spring Creek district 238 



Whiskey Creek 259 



IV. Castle aud 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 



II. Water supply 311 



lU. SoU 313 



IV. Wildfruits 315 



V. Grazing 317 



VI. Timber 320 



