304 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



3,300 feet east of Indian Creek; and on the south wall, 

 about 2,300 feet southeast of the post-office, on the east side 

 of the spur leading up to Glacier Point, at an altitude of 

 500 feet above the valley floor. 



On the hill, v^hich is 7,000 feet high, lying nearly three- 

 fourths of a mile southeast of Cathedral Rocks, is a jumble 

 of rocks of small extent somewhat resembling a moraine. 

 It is composed of boulders of dioritic rocks, Bridal Veil 

 granite, and of coarse El Capitan granite.' One decom- 

 posing boulder of coarse granite contains porphyritic feld- 

 spars, some of them over an inch in length, and resembling 

 somewhat the porphyritic granite of Lake Tenaya, boulders 

 of which were found in the moraines on the valley floor. 

 Excepting this porphyritic granite,^ the bowlders referred 

 to need not be far from the place. The rock immediately 

 underlying the jumble is coarse El Capitan granite, and the 

 dioritic rocks and Bridal Veil granite are both in place on 

 the same spur. It is the rounded form of the boulders and 

 their indiscriminate mixing rather than the character of the 

 rocks that is suggestive of a moraine. There is some polish" 

 on the southwest side of the valley, a little below the 

 Wawona road, at an altitude of about 4,800 feet; also some 

 by the road further west, at an altitude of 5,200 feet. The 

 spur that extends north from a little west of Fort Monroe, 

 and which may be said to form the west wall of the valley, 

 shows evidence in its smooth form of having been covered 

 by the glacier. There are perched boulders on it which 

 look as if they have been left there by the ice, but the rock 

 of which they are composed (El Capitan granite) being the 

 same as the rock composing the spur, the evidence is not 

 conclusive. However, we found polish and groovings on 

 the east side of this spur at an elevation of about 4,800 feet, 

 and the direction of the groovings shows that the ice went 



1 strictly speaking this rock is also a quartz-monzonite, for the amount of ortho- 

 clase is at least as large as the amount of plagioclase, and this may likewise be true 

 of the Bridal Veil granite. 



- This porphyritic granite may have come from a porphyritic facies of an aplite dike, 

 to be found at a point not far away. 



3 The first discovery of this polish was due to Prof. J. C. Branner, whom I desire to 

 thank, also, for other assistance. 



