1922] Vaughan: Geology of San Bernardino Mountains 391 



has a rough bedding which is best seen where streaks of sand are 

 present. It is tilted, in some places to angles as high as 40°, and also 

 somewhat faulted. It seems that from this point eastward to Stubby 

 Canon the northern portion is warped with dips up to 20° and 30° 

 to the north, while along the southern edge the beds are practically 

 horizontal. 



The contact with the sandstone and shale on the north is not easy 

 to follow because of the fact that these rocks yield readily to weather- 

 ing and the detritus from both becomes mixed. On the east side of 

 Deep Canon the fanglomerate overlies the sandstone and shale, but 

 two miles farther east the contact is a fault. On the west side of 

 Stubby Canon it is clearly faulted against the old schists, the move- 

 ment here being on the San Andreas fault. On the east side a small 

 block is isolated on the north side of the fault by a slice of schist 

 which has been faulted up between it and a narrow strip a little to 

 the south. Two other small areas are found between this point and 

 Cottonwood Canon along the edge of the hills and two others project 

 above the alluvial fan about half a mile south of Cottonwood. 



Between Cottonwood Canon and Whitewater River a large rectan- 

 gular block of fanglomerate is faulted against the schist to the north. 

 The material is very similar to that now being deposited at the mouth 

 of Whitewater. It contains a great deal of small angular and sub- 

 angular debris, and also some larger boulders over eight feet in diam- 

 eter. The bedding is poorly developed and its general attitude is 

 horizontal. 



On the east side of Whitewater, near its mouth, there is a large 

 area of fanglomerate which swings around east of Painted Hill and 

 northward, overlying the east edge of the Coachella fanglomerate. A 

 small strip extends along the bank of Whitewater River west of Red 

 Dome and another along the east bank northwest of Painted Hill. 



Fanglomerate lies between Whitewater River and Mission Creek. 

 That between Red Dome and Hog Ranch is nearly horizontal and 

 overlies the Coachella fanglomerate, basalt, and the old schists. A 

 mile north of Red Dome the situation is not so simple. Here hori- 

 zontal fanglomerate is found overlying lithologically identical beds 

 which have dips up to -35°. While ordinarily such a discordance 

 would demand a separation, the fact that both were laid down near 

 the great Mission Creek fault is sufficient to explain this break, even 

 though the general conditions of deposition remained the same and 

 the time was short. West of Hog Ranch the fanglomerate rests nearly 

 horizontally on the basalt and schists. At the mouth of Big Morongo 



