Index 



Quarternary deposits of Cape 



Blanco, Oregon, 245. 

 Quercus, 414. 



Rainless regions, degradation of me- 

 chanical disintegration, gravita- 

 tional transportation, wind-trans- 

 portation, corrasive action, 23; 

 slope of talus the limiting slope 

 of mountain facets, 24, figure of, 

 25; talus profile a permanent 

 feature of mountain fronts, 25. 



Raneho La Brea, Pavo californicus 

 of, 89; owl remains of, 97; vul- 

 turid raptors of, 105; capro- 

 meryx material from, 111; bison 

 material, 124. 



Reagan, A. B., cited, 282. 



Recent fauna, mactroid species, in 275. 



Relation of the Invertebrate to the 

 Vertebrate Fannal Zones of the 

 Jacalitos and Etchegoin Forma- 

 tions in the North Coalinga 

 Region, 77. 



Relationship of Equus to Pliohippus 

 Suggested by Characters of New 

 Species from the Pliocene of 

 California, 525. 



Rhinoceros hesperius, 414. 



Rhinoeerotidae, 180. 



Rhus, 414. 



Ricardo, Mohave Desert, California, 

 figures of type specimens from, 

 54, 55; Pliocene, 3, 55. 



Rimella simplez zone, of the Cali- 

 fornia Tejon, 366, 374; specie in, 

 376. 



Rocks, chemical decay (decomposi- 

 tion of), under humid condi- 

 tions, 27, due to bacterial action, 

 28. 



Rock slopes, relation to alluvial 

 slopes, 26; size of fragments 

 from, 29; steepness, 30; over- 

 steeping-, 30; alluvia tion, 30; 

 truncation, 31; minimum angle 

 for transportation, 32; panpan 

 and peneplain, 33, 44; subaerial 

 front, 31, 34, 42, rate of reces- 

 sion of, 35, 42, contour, 42; sub- 

 alluvial bench. 34. revealed as 

 element in visible profile by 

 stripping of alluvial fans, 34, 

 45; curved surface of, 35; con- 

 cave or convex, 36, determined 

 by acceleration of rate of rise 

 of the fan surface, 37, 44; nub- 

 bins, 38. 



Rock terraces, explanation of, on 

 desert mountains in California, 

 Nevada, Arizona. New Mexico, 

 Mexico, 34. 



Ruckman, J. H., cited, 79; acknowl- 

 edgment of assistance, 367; cited 

 on white shales, 435. 



Rumble Mine, near Oroville, Cali- 

 fornia, 390. 

 Sabalites, 414. 

 Salix, 415. 



San Andreas fault, California, 201. 



San Diego, California, type locality 

 of Lower Chico, 139; Tejon 

 fauna in, 437, 439. 



San Francisco Basin, a negative 

 area in Eocene time in Califor- 

 nia, 467, 468, 471. 



San. Joaquin Valley, California, fig- 

 ures of type specimens from, 52. 



San Lorenzo formation, 10, 11, 20; 

 of the Santa Cruz Quadrangle, 

 19; relation of Oligocene of, to 

 Tejon fauna, 454. 



San Pablo formation, 9; mactrine 

 fauna of, 274, 276. 



San Pedro fauna, mactroid species 

 in, 275. 



Santa Ana Mountains, California, 

 Cretaceous localities in, 137; 

 mactrine species in, 274. 



Santa Clara Valley oil district, Te- 

 jon strata found in, 464. 



Santa Margarita formation, 201. 



Santa Maria oil district, Tejon 

 strata found in, 464. 



Santiago Canon, California, Creta- 

 ceous section in, 142. 



Sargent oil field, Etchegoin of, 244; 

 fauna of, 244, 245, 251-258; cor- 

 relation of, 259. 



Schizodesma abscissa, 264, 289. 



Schizothaerus nuttallii, 270; graph 

 of, 269; figures of, 360. 



Scutella breweriana zone, 9. 



Seattle formation, 11, 20. 



Shasta County, California, relation- 

 ship of Chico fauna of, to Horse- 

 town fauna, 150; type locality 

 of Chico formation, 153. 



Shasta group of the California Cre- 

 taceous, 138. 



Siderastrea clarki, 65; figures of, 

 opp. 74. 



Sierra Nevada, geological events 



along- western foothills, 416. 

 Silver Peak region, succession of 



lavas from, 166. 

 Silverado Canon. California, type 



locality of Lower Chico, 139; 



Chico affinities of fauna of, 150. 

 Simomactra, 279. 



Siphonalia sutterensis, 498; figure of, 

 opp. 514. 



Siphonalia sutterensis zone, of the 

 California Tejon, 366; list of 

 species from, 406; list of local- 

 ities, 408. 



Snyder, J. O., cited, 172. 



Spectyto cunicularia, 104. 



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