564 INDEX. 
Pliocene channels, compared with present, 64. Quart vein, the Great, 45, 331. ; 
Pliocene and Recent, difficulty of drawing line between, 283. | Quartz veins, their association with auriferous gravel de- 
Pliocene rivers, areas drained by, 342. posits, 56, 57. 
Plug Ugly Hill, 153, 417, 419. near Chips’s Flat, 435. 
altitudes taken near, in 1870 and 1879, com- epoch of their formation, 880, 358. 
pared, 417. : forms of gold in, 358. 
Plumas County, fossils from, 36. near French Corral, 390. | 
official map of, 444. general distribution of, in bed-rock, 351. 
and adjacent parts of Sierra County, topo- of Mariposa County, 302. 
graphy of, 444. mineralogical character of, 56. 
Poker Flat, serpentine at, 459. persistency of, 355. 
Pokerville, locality of implements in gravel, 275. Quicksilver, geological formations in which it occurs, 21. 
Polar Star Mine, near Dutch Flat, 417, 421. Quincy and vicinity, 215, 470-478. 
Pond’s Claim, near Todd’s Valley, 118. Quiney and Sierraville, region between, 478, 479. 
Pontiac Hill, near Nevada City, 188. Quien Sabe Ravine, 474. 
Porphyritic green slate, a diabase tufa, 44. Quigley Ravine, 475. 
Portwine, 455. 
Position, elevated, of gravels discussed, 344. Rafael (San) Mountains, geology of, 19. 
Post’s Claim, in Wilson’s Ravine, 469. Rain, the quantity of, as connected with erosion, 338, 
Potato Ravine, 149. Rain and rivers, the cause of bed-rock erosion, 337. 
Pot-holes in bed-rock, at Manzanita Hill, 387. Rain-fall in Great Valley, 13. 
Potosi Mine, 89. in Pilarcitos Valley, 13. 
Poverty Hill, 454. in Sierra Nevada, 14, 
Powder, great quantity used at one blast rt Smartsville, 193. at Visalia, 14. 
use of, in hydraulic mining, 373. Railroad Claim, near Quaker Hill, 179, 
at Manzanita Hill, 389. Railroad Flat, 126. 
at Malakoff Mine, 396. Railroad Hill, near Camptonville, 428. 
Powningville, 85. Randall’s Claim, near Aqueduct City, locality of mortars in 
Pratt’s Hill, near Jone City. 127. gravel, 275. 
Precipitation, increased, in gravel region, the essential cause | Range, vertical, of fossil plants, 235. 
of difference between past and present epochs, 335. ~ Rattlesnake Mine, near Deadwood, 92, 110. 
Present epoch, in gravel region, how separated from past, | Recent drainage sytem of Sierra Nevada, its peiliecnnan 
241. discussed, 345. 
Present cahons, position of, not due to orographie causes, | Red Dog and Quaker Hill, channel between, 419. 
SAB. a ; Reed Claim, near Deadwood, 92, 105, 109, 110. 
Princeton, locality of implements in gravel, 262. locality of fossil wood, 238. 
Prior Ravine, near Quaker Hill, 179. Reed Claim, Mameluke Hill, 96. 
Primordial stock, no trace of man’s, 287. Red gravel, its relation to the blue, discussed, 325, 326. 
Proboscide, range of, in North America, 251. Red Point, near Damascus, 92. 
remains of, in gravels, 251-256. Reducing agencies, propagated fiom below, 332. 
Progress of prehistoric man in America towards civilization | Refuge Cafion, near Wisconsin Hill, 83, 91. ‘ 
small, 287. Relief Hill, 201, 404. 
Propylite, nature of, 350. Remington Hill, 175. 
Prospect Flat, locality of infusorial silica, 225. Rémond, A., his explorations in Tuolumne County, 81. 
Report on gravel, a perfect one not possible, 289. 
Q Ranch, near Ione City, 127. Résumé of gravel phenomena, 289-376. ; 
Quail Hill, 122, 352. Review of geological character of the Coast Ranges, 18-24. _ 
Quaker Hill and vicinity, 177-181, 423-425. Rhinoceros occidentalis, from Chili Gulch, 243. 2 
Quaker Hill and Indiana Hill, table of altitudes between, 420. from Douglass Flat, 243. 
Quartz, large boulder of, in Cariboo Ravine, 159. if analysis of bone of, 244. ; a 
large masses of gold in, 359. Ribeiro, his evidence as to Tertiary man in Portugal, 282. ° 
Quartz boulders, in channel at Damascus, 493. Richthofen, F. v., his views in regard to ancient channels con- 
at Moore’s Flat, 403. troverted, 316. 
Quartz crystals, in fossil wood, 237. Riffles, used in gold washing, 59. wy) 
Quartz-diorite, from bed-vock, near French Corral, 386. Rim-rock, defined, 76. 
Quartz mining and gravel regions, essentially the same, 350. at French Corral, 387. 
Quartz gravel, on Dutch Flat Hill, 422. gravel often richest on, 518. goes 
discussion of, 3238. River mining, 60, 335. r > jae 
Quartz vein, in gravel, 330.- - . | Rivers, draining western slope of Sierra Nevada, 10, 11. — > 
