BULL. DEPT. GEOL. UNIV. CAL 



VOL, 3, PL. 35. 



A 



Toowa Valley looking east from summit of volcano shown in Plate 3(Ja. 

 The broad, ancient valley floor has been dissected and since aggraded to 

 the present meadow level. 



B 



The mouth of Volcano Creek and the floor of Upper Kern Canon. The 

 creek had once cut down nearly to the level of the bottom of Kern Canon and 

 was then filled with lava — the dark rock in the middle of the picture. Since 

 then a narrow precipitous gorge has been cut partly in the lava and partly 

 between it aiid the granite. 



