TERRESTRIAL DEPOSITS OF OWENS VALLEY 735 



of fan No. 8 is granite, the other 1 per cent scoriaceous lava and 

 slate. All the face of the mountains here is granite, which is bor- 

 dered along the edge of the Santa Anita flat by slate. Lee 1 maps 

 a volcanic mountain southeast of Aberdeen, which doubtless ex- 

 plains the occasional fragments of scoriae. The fan northeast of 

 Aberdeen is composed of bits of granite, gneiss, scoriaceous basalt, 

 and limestone. All these rocks occur together in the walls of the 

 canyon. Fan No. 1 is made up largely of bits of lava, sedimentary 

 rock, and granite. No. 2 is mostly of sedimentary rock and lava, 



Fig. 23. — Bowlders on the surface of fan No. 8 north of Citrus. Their size may be 

 estimated. 



with some fragments of granite. No. 3 contains a mixture of sedi- 

 mentary rock, diorite, and granite, in keeping with the rocks east 

 of it. 



On the surface of the fans there are both coarse and fine materials 

 arranged as on the Sierra bajada in diverging lines or belts from the 

 head of the fan. 



Though the bowlders are not so large as on the opposite side of 

 the valley, they are still astonishingly large for the drainage by 

 which they were transported. The largest bowlders seen were 

 near the head of fan No. 8, where there are some 10-12 ft. in diam- 

 eter. On fan No. 2 bowlders are especially numerous. Toward 



1 W. T. Lee, Water Supply and Irrigation Paper, U.S. Geot. Surv., No. 181, PI. I. 



