290 University of California Puhlications in Geology [Vol. 12 



left corner of fig. 1 ) . No clear plane of meeting of basement complex 

 and sedimentary deposit is observed in the wall of Rouse's Canon to 

 the southeast, the stream cut, which there follows the line of division, 

 running within the fill of a previously excavated channel. 



The Soboban portion of the deposit is limited northward by the 

 metamorphies of Claremont and San Jacinto, where the sedimentary 

 beds are faulted down against the side of the mountain. In places 

 they lie directly beneath great, slickensided faces. At least two fault 

 lines occur : that of the main northwest and southeast Claremont fault, 

 mentioned below in conjunction with the hypothetical southern 

 Badland-Eden Mountain line; and a fault running northeast that cuts 

 the first at an angle of 45 degrees and forms the southeast corner of 

 Mount Claremont. The sedimentary beds of the northeast corner of the 

 Sobodan exposure in the immediate vicinity of the fault dip away 

 from the granites, while those a short distance south, along the plane 

 of contact, dip in the opposite direction. This northern dip has 

 again been noted in the poorly stratified exposure of the river bank, 

 and is believed to be the one general to this part of the formation. 

 The structure of the loosely piled deposit, however, shows the results 

 of many violent stresses and is far from uniform. An apparent 

 unconformity in a cliff of coarse, slightly indurated sand at the 

 mouth of Poppet Creek is believed to represent merely an exceptional 

 example of the general disturbance. At this point a large section 

 dipping 15 degrees to the south-southwest apparently rests on another 

 that dips 75 degrees to the south-southeast. 



The principal exposure of the Bautista in which collections were 

 made by the writer was the southeastern third of the more southern 

 area, and is known as the type locality (pi. 44, figs. 1, 2) . It is bounded 

 on the south by Bautista Creek and on the north by the sedimentary 

 wash of Whittier Canon that roughly parallels the latter at a distance 

 of a mile and a-quarter. It includes the whole eastern half of the 

 southern portion of the deposit. The beds lie in a twisted and broken 

 fold, whose generalized axis stretches northwest and southeast in line 

 with Park Hill and the so-called Bald Mountain ; the dips of the north 

 and south limbs in passing from east to west twist respectively from 

 northeast and southeast to northwest and southwest. The bedding 

 planes, like those of the Soboban exposure, indicate the warping that 

 the whole lightly indurated region has suffered, their continuity being 

 tremendously broken and confused through local faults and slides. A 

 modern and very interesting example of a great slide is to be seen at 

 the northern end of Whittier Canon, a result of the San Jacinto-Hemet 



