390 University of California Publications in Geology [Vol. 13 



Bench. It bears the same physiographic relationship to the surround- 

 ing country as that at Raywood Flat and in Santa Ana Canon, and the 

 material is also very similar. The same kind of fragmental rock is 

 found at the mouth of San Gorgonio Canon on both sides. On the 

 west side it forms part of the bench and rises above the more recent 

 sediments. A mile and a half from the mouth of the canon it is again 

 seen as two small hills on the bench. It therefore seems probable 

 that the older fanglomerate was continuous with that below Pine 

 Bench, and that its deposition is referable to the same period as those 

 of Raywood Flat and Santa Ana Canon. In Cherry Canon and Little 

 San Gorgonio there are extensive benches corresponding to Banning 

 Heights and in some places the streams have cut down into an old 

 fanglomerate greatly resembling that described above. It is quite dis- 

 tinct from the overlying fanglomerate in that it is nearly always of a 

 reddish color and contains many boulders so decomposed that a pick 

 may be driven into them as easily as into the matrix. 



Along the south flanks of the range there are several areas of fan- 

 glomerate. These are correlated by reason of their lithologic simi- 

 larity on the assumption that the conditions favoring the deposition 

 of fanglomerate were very likely general. 



At the mouth of Hathaway Canon fanglomerate is found on both 

 sides. On the east side the base of this deposit cannot be seen, but 

 on the west side it rests on basalt and the old schists. The southern 

 half of the valley at the head of the canon is floored with similar 

 material resting on a smooth surface, carved from the older rocks, 

 which is continuous with the northern portion of the valley floor. 



The hill at the mouth of Millard Canon is entirely of fanglomerate, 

 some of the boulders of which are more than five feet across. As is 

 generally the case, the freshly exposed material is yellowish in color, 

 but the portions which have been exposed for any considerable time 

 are red. Similar material is also found on the east side of the canon, 

 where it overlies shale, sandstone, and basalt. High up on the ridge 

 just north of this area there are horizontal strata of gravel and fan- 

 glomerate. The San Andreas fault lies between these two areas and 

 they may have been continuous at one time. 



A rather large area of fanglomerate extends from Deep Canon to 

 Stubby Canon. Its general attitude is horizontal, but in some places 

 it has been warped considerably. On the east side of Deep Canon 

 nearly all the detritus is sharply angular and very coarse, blocks eight 

 feet across being common. Not the slightest trace of bedding is recog- 

 nizable. About a mile farther east the material is not so coarse and 



