

■i- 



TABLE OF CONTENTS. 



CHAPTER I. 



GENERAL DISCUSSION OF THE TOPOGRAPHICAL FEATURES AND GEOLOGICAL STRUCTURE 



OF THE STATE OF CALIFORNIA. 



Pages 



Section I. Topographical Sketch 1-15 



II. Geological Age and Structure of the Coast Eanges 15-26 



III. The Geology of the Sierra Nevada 27-52 







CHAPTER II. 



E TERTIARY AND RECENT AURIFEROUS DETRITAL AND VOLCANIC FORMATIONS OF 



THE WEST SLOPE OF THE SIERRA NEVADA. 



Section I. A General Sketch of the Distribution and Mode of Occurrence of 



the Volcanic and Gravel Formations of the Sierra 53-78 



II. Detailed Description of Portions of the Auriferous Gravel Eegion 78-218 



Subdivision I. Placer, El Dorado, and Amador Counties 81-120 



§ 1. The Lithological Character and Stratigraphical Position of the 



Bed-Rook 83-89 



§ 2. Bed-Rock Surface under the Gravel 89, 90 



§ 3. Crevices in the Bed-Rock 90 



§4. Character of the Gravel Deposits 90-102 



§ 5. The Volcanic Capping of the Gravel j its Thickness and Gen- 

 eral Character 103-105 



§6. The Channels; their Width 105-108 



§ 7. The Channels ; Eecent Changes of their Position 108 



§8. The Channels; their Grade 109 



§ 9. The Channels ; their Varying Character 109 



§ 10. The Channels, Occurrence of Basin-like Depressions in them ... 109 



§11. The Channels; their Direction 109-112 



§ 12. The Gold; its Distribution in the Gravel, and Position with 



Reference to the Channel and Rim-Rock 112, 113 



§13. The Gold; its Size and Character 113, 114 



§14. Seam Diggings 115,116 



§15. Amount and Yield of Gravel worked 116-119 



§ 1 6. Amount of Gravel still remaining 119, 120 







