556 INDEX. 
Clay bank, near La Porte, 448. Coyote Diggings, Nevada County, 189. 
Clermont Peak, 215, 216, 476. Cozzen’s & Garber’s Mine, 167. 
Cleveland Mine, at Scales’s Diggings, 454. Craig’s Flat, mines at, 459. 
Clinton Claim, Grizzly Canon, 117. Crane’s Gulch, bed-rock at, 85. 
Cloud-bursts, 15. sean diggings at, 116, 
Clydesdale Claim, locality of white lava, 225. Crayeroft’s Hill, 465. 
Coal Cation, near Cherokee Flat, 485. Crescent ‘Tunnel, 439. 
Coast Ranges, geological age and structure of, 15-26. Cretaceous rocks, in Coast Ranges, 21-28. 
formed, in part, from débris of Sierra Nevada, on flanks of Sierra, 315. 
346. wauting in gravel series, 317. 
in contact with Sierra in Northern California, | Crevices, in bed-rock, 90. 
315. Cruz (Sta.) Range, geology of, 21. 
gravels in, 299, 300. Crystallized gold, occurrence of, 358. 
rain-fall in, 13. 
résumé of geology of, 25, 26. Dahneke’s, D. H., Tunnel, 432. 
rocks of, 17. Dam Claim, E] Dorado Cation, 93, 112, 117, 498. 
topography of, 4. Spanish Dry Diggings, 115. 
uplift of, its character, 17. Dam, the Rudyard, 198. 
Coherence of sandstones, cause of, 326. Dams, artificial, formed by tailings, 425. 
Cold Cafion, 458. Damascus Cation, 91, 491, 493. 
Cold Spring Mountain, 144. Dardanelles Claim, 84, 90, 95. 
Colfax, voleanic rocks at, 103. Davis Point, 467, 468. 
locality of fossils, 37. Deadhead Claim, near Newtown, 101. 
Coloma, human femur in cement at, 277. Deadwood, near El Dorado Cafion, 108, 112, 492. 
Columbia, Tuolumne County, mining on limestone, 124, 139. on Ridge between Cation and Little Catton Creeks, 
implements in gravel at, 263. 459, 460. 
locality of vertebrate fossils, 256, 257. Deadwood Channel, near Elizabethtown, 472. 
Columbia Mine, Placer County, 107. Dean’s Tunnel, near Nevada City, 184. 
Columbia Hill, Nevada County, ditches centering at, 197. Decomposition of bed-rock under gravel, 434. 
width of channel at, 343. Deep Caiion to Last Chance, 103. 
mining at, 395. Deer Creek, lava-flows down, in vicinity of, 181. 
aud Lake City, channel and gravel between, | Democrat Ravine, near Remington Hill, 177. 
394. Densmore’s Claim, near Startown, 97, 108. 
Columbia River, theory of its connection with the “ Blue | Denudation in Sierra Nevada, since close of volcanic epoch, 
Lead,”’ discussed, 511. 522. 
Compression, longitudinal, of slates, in Sierra, 49. Depot Hill, near Camptonville, 428. 
Comstock Lode, its geological position, 354. Depressions and furrowings, in bed-rock, 517. 
Conditions required for successful hydraulic mining, 298. Depths to which gold mines are worked, 355. 
Confidence Mine, Cedar Ravine, 99. Derbec shaft, 399. 
Conglomerate, voleanic, how accumulated, 525. Des Chutes Basin, Oregon, locality of infusorial silica, 227. 
Congregationalist (newspaper) informed by a clergyman that | Detrital materials, mode of occurrence of, in river channels, 
the Calaveras skull is a hoax, 270. 345. 
Coniferous trees, none during gravel epoch, 234. Devil’s Basin, 93, 105, 492. 
their present predominance in the Sierra, 233. Diamonds, at Cherokee Flat, 483. 
Conness, John, first light on geological age of auriferous occurrence of, in gravels, 362-364. 
slates from him, 35. microscopic, from California and Oregon, 364. 
Connor Hill, near Nevada City, 190. origin of, in gravel, 520. 
Coon Hollow, near Placerville, 108, 119. Diamond Creek, 411. 
Copper, native, in gold washings, 366. Dick Claim, El Dorado Cation, 109, 117. 
tools of, their use in this country not implying a| Dickerhoff’s Mine, near Placerville, 99, 111. 
great advance in civilization, 287. Difference between Tertiary and Recent Epoch, the essential, 
Copperopolis, bed-rock near, 122. 335. 
Cordilleras, metallic wealth of, 355. Dikes, volcanic, connected with metalliferous deposits, 310. 
Cosumnes Copper Mine, bed-rock at, 86. Dip of slates in Sierra Nevada, 50. 
Council Hill, 453, 454. Dirty Flat, direction of channel at, 111. 
Council Hill, to Howland Flat, region examined, 452-458. occurrence of diamonds at, 363. 
Council Hill, channel traced from that point to Potosi, and | Distribution of gold in the gravels, 361. 
lost, 458. the gravels, generally considered, 298-314. 
Course of events during gravel period, 515. Disturbances in gravel since its deposition, at Bean Hill, 474. 
