Studies in the Sierra 



315 



Fig. 7, taken from the Hoffmann fork of Yosemite Creek ba- 

 sin, shows the character of some of these steps. This one is 

 fifteen feet high at the highest place, and the surface, both at 

 top and bottom, is ice-poUshed, indicating that no disturbing 

 force has interfered with the phenomena since the termination 

 of the glacial period. 



Fig. 8 is a dome on the upper San Joaquin, the top of which 

 is about 7700 feet above sea-level. The arrow indicates the di- 

 rection of application of the ice-force, which is seen to coin- 

 cide with the position of remaining fragments of layers, the 

 complements of which have been eroded away. Similar frag- 

 ments occur on the stricken side of all domes whose structure 



and position were favorable 

 for their formation and pres- 

 ervation. 



Fig. 9 is a fragmentary 

 dome situated on the south 

 side of the Mono trail, near 

 the base of Mount Hoffmann. 

 Remnants of concentric shells 

 of granite from five to ten 

 feet thick are seen on the up-stream side at A, where it received 

 the thrust of the Hoffmann Glacier, when on its way to join 

 the Tenaya, above Mirror Lake. The edges of unremoved lay- 

 ers are visible at B and C. This rock is an admirable illustra- 



FiG. 9. 



