1922 ] Yaughan: Geology of San Bernardino Mountains 



377 



In the canon two miles west of San Gorgonio River, the sandstone 

 is faulted against the schist on the north and west and is overlain by 

 fanglomerate on the east. 



At the mouth of Hathaway Canon, on the west side, the sandstone 

 overlies the shale and both are warped to dips as high as 45°. They 

 are overlain by basalt and fanglomerate. A small area of similar 

 sandstone is overlain by volcanic material on the little hill one mile 

 west of Millard Canon. 



Between Millard and Stubby canons there is a strip of .sediments 

 which are believed to be correlative with the Hathaway formation 

 because of litbologic similarity and also because of their position 

 beneath a basalt flow. Portions of tbis mass, however, are somewhat 

 different from any found west of the San Gorgonio River, but if, as 

 has already been suggested, these are land-laid deposits, this local 

 variation is to be expected. 



On the west side of Deep Canon both sandstone and shale are 

 found together, but the beds are vertical and so faulted that their true 

 relationship cannot be deciphered. On two small ridges east of this 

 canon both were found striking nearly east and west and dipping 50° 

 to 70° north beneath the basalt. A narrow strip of shale could be 

 followed along the south side of the sandstone. The shale and finer 

 portions of the overlying sandstone are cut by numerous faults and 

 along these gypsum and calcite have been deposited. In some places 

 nodules were found within the mass. 



"West of Lion Canon a small mass of fossiliferous Lion sandstone 

 projects up through the Hathaway sandstone, but the nature of the 

 contact is obscure. Just east of this point a light buff -colored sand- 

 stone lies beneath the bluish grey sandstone so characteristic of the 

 Hathaway formation. These sandstones are separated by 5 to 20 feet 

 of rhyolite fragments seen nowhere else in the whole region. The 

 buff sandstone is similar to the grey in that it consists of angular 

 unsorted material and contains many poorly defined strata in which 

 some of the boulders are more than a foot across. The whole series 

 dips to the north at about 45 degrees. The shale is not seen here, but 

 half a mile east of Lion Canon it again outcrops and is rather contin- 

 uous for more than a mile. 



Along the south side of this strip of shales and sandstone there is 

 a large mass of fanglomerate. Because of the loosely consolidated 

 nature of this material the contact is usually obscure. On the ridge 



