TABLE OF CONTENTS. 
CHAPTER I]. 
GENERAL DISCUSSION OF THE TOPOGRAPHICAL FEATURES AND GEOLOGICAL STRUCTURE 
y OF THE STATE OF CALIFORNIA. 
' Paces 
Samay I NGG ETRE Std GS oT els ee ee a re t=15 
Il Gkrontocgica, AGE AND STRUCTURE OF THE Coast RANGES .................. 15-26 
Die) fee meroGy, Gi THe, SimGRA - NEVADA 5 ......cc50.c0cccccevcnceccpaccccecceseees 27-52 
CHAPTER II. 
THE 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 MopE OF OCCURRENCE OF 
THE VOLCANIC AND GRAVEL FORMATIONS OF THE SIERRA...............0+- 53-78 
TI. Derartep Description oF PorTIONS OF THE AURIFEROUS GRAVEL REGION 78-218 
Suspivision IJ. Pracer, Ex Dorapo, anD AMADOR COUNTIES............cesseeeeeeeeeeeees 81-120 
§ 1. The Lithological Character and Stratigraphical Position of the 
ER SOE Rr n te LN idietsienld cin Rica as piedldd ows oc aeeonney s- cas 83-89 
§ 2. Bed-Rock Surface under the Gravel ..................:0sseeeeeeeeees 89, 90 
So. Crevicés mm the Bed-Rock ..........0-s0.cescee ees tenesceneeeneoneneees 90 
§ 4. Character of the Gravel Deposits ..............s.cseeeee eee ee eee eees 90-102 
§ 5. The Voleanic Capping of the Gravel ; its Thickness and Gen- 
Oa MORICHES ooo cnc seit cele ee vie bia aes oinelelde «Sank anHinonig ewe geste +e 103-105 
§ 6. The Channels ; their Width ...............:seeeeeeeee renee ee eee eens 105-108 
§ 7. The Channels ; Recent Changes of their Position...........-....+- 108 
§ 8. The Channels; their Grade .............:ecee eee ee eens ee ee ee eenenens 109 
§ 9. The Channels; their Varying Character ...........-+::eeseeeeeeee 109 
§ 10. The Channels, Occurrence of Basin-like Depressions in them ... 109 
§ 11. The Channels; their Direction .............:.::seseseeeseeeeeeeeeeees 109-112 
§ 12. The Gold ; its Distribution in the Gravel, and Position with 
Reference to the Channel and Rim-Rock.................:00+++ 112,113 
§ 13. The Gold ; its Size and Character.........--+112+ seeeeeesreeessee ees 113, 11+ 
§ 14. Seam Diggings ......... Re rahe p0 Fy ve Staaten Sune dagen mana 115, 116 
§ 15. Amount and Yield of Gravel worked ..........--s0seese0¢sereee es 116-119 
§ 16. Amount of Gravel still remaining..........--s6s-s-s+seereeeeeeereees 119, 120 
