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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 15-20 



III. The Geology op the Sierra Nevada 27-52 



CHAPTER II. 



TILE 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 Keg ion 78-218 



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



§ 1. The Lithological Character and Stratigraphical Position of the 



Bed-Eock 83-89 



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



§ 3. Crevices in the Bed-Eock -W 



§ 4. Character of the Gravel Deposits 90-102 



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

 eral Character... 103-105 



§0. The Channels; their Width 105-108 



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



§8. Tho Channels ; their Grade . 109 



§ 9. The Channels ; their Varying Character • • • • • 1 0i) 



§ 10. The Channels, Occurrence of Basindike Depressions in them ... 109 



§11. The Channels ; their Direction 109-112 



§12. The Gold \ its Distrihntion in the Gravel, and Position with 



Reference to the Channel and Rim-Rock 112, 113 



§13. The Gold; its Size and Character ' US, 1H 



§14. Seam Diggings 115, lit) 



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



§ 16. Amount of Gravel still remaining H 9, 1 20 



