EXPLANATION OF PLATES 327 



Explanation of Plates 

 Plate 43. — Assemblages of Phenocrysts in Granite 



Figure 1. — Feldspar. 



The locality is on tbe north slope of a granite dome, between 

 Tuolumne meadows and McGee lake, Sierra Nevada. The 

 crystals are in situ, being brought into relief by the weather- 

 ing of the granite. The upper limit of the assemblage ap- 

 pears in the view, and above it some of the ordinary granite. 

 The view covers a width of three feet. 



Figure 2. — Hornblende. 



The locality is at the base of mount Silliman, near a branch of 

 Sugarloaf creek, Sierra Nevada. The view shows the upper 

 part of an assemblage. The granite immediately above is 

 nearly normal, but has a slight excess of hornblende. The 

 white patches at right are of aplite. The hammer handle, 

 giving scale, is 15 inches long. 



Plate 44. — Banded Granite 



The locality is one mile south of Cooper meadow, in the upper 

 basin of the South fork of Stanislaus river, Sierra Nevada, 

 near the middle of the Dardanelles quadrangle of the U. S. 

 Geological Survey Atlas. An unconformity is shown to the 

 left of the man's wrist. 



