392 University of California Publications in Geology [Vol. 13 



Creek there is a small area jutting sharply into the schists ; the south 

 and east boundaries are faults. 



A strip of fanglomerate extends along the southwest side of 

 Morongo Valley. There is also a small area at the divide shown on 

 the edge of the map and another on the divide between the valley and 

 Dry Morongo Creek. All three of these may possibly be remnants 

 of a more extensive area tbat once filled the Morongo Valley. 



In the valley east of The Pipes there is a great stretch of fan- 

 glomerate into which the present streams have cut. In many places 

 this fanglomerate grades into the slopes up to the flat-topped hills. 

 The open valley southeast of Mound Spring is also floored with fan- 

 glomerate. In discussing the physiography of the region, both of these 

 valleys were considered as probably contemporary with Bear and Hol- 

 comb valleys. It therefore seems reasonable to believe that the fan- 

 glomerate is also of about the same age as other widespread deposits 

 having the same relationships to the topography. 



Heights fanglomerate. — Several areas of fanglomerate are found 

 in this region which were laid down under the same conditions as 

 obtain at the present day, but they have been uplifted and are under- 

 going dissection. Banning Heights is floored with such an accumu- 

 lation which overlies schists and granite, the Hathaway shales and 

 sandstone, and the Cabezon fanglomerate. Along the south front of 

 the range there has been a recent movement which has raised the floor 

 of the Heights more than 500 feet above the San Gorgonio Pass, where 

 similar material is now being laid down and with which it was for- 

 merly continuous. The San Gorgonio River has cut down through 

 the uplifted sediments until it is now on a grade with the Pass. 



In Hog Canon, Little San Gorgonio Creek, and Cherry Canon 

 there is an extensive fanglomerate at the same general elevation as 

 Banning Heights. It is of the same sort of material and bears the 

 same relationships to the surrounding topography, even to the scarp 

 which forms the southern limit, with the difference that it is much 

 lower. 



On the north side of the range there are several areas of fanglom- 

 erate which are probably of about the same age as those described 

 above. One such area forms a bench extending from Marble Canon 

 to Silver Creek. The material is the same as that now being deposited 

 but somewhat more consolidated, and it has also been uplifted and 

 incised by the present streams. A similar uplifted area is found two 

 miles west of Two Hole Springs and another two miles east of Rock 

 Corral. 



