48o 



SAMUEL WEIDMAN 



middle projecting head has slumped appreciably from its original 

 position. 



A close view of another example of the grooved surface is fairly- 

 well illustrated in Figure 9, which shows grooves over one foot across 

 and one-half foot deep. The ridges between the grooves show 

 spalling and roughening by weathering. The sharpness of the 



grooves cut into the massive 

 granite is illustrated in Figure 

 10, which shows a large block 

 slumped down from the 

 grooved zone adjacent. The 

 grooved surface of Figure 10, 

 because of its protected posi- 

 tion on the under side of the 

 turned-over-block, remains 

 smoothly polished while the 

 grooves shown in Figures 8 

 and 9, where unprotected and 

 exposed to the sun, rain, and 

 wind, are very rough. 



The grooved granite sur- 

 faces are preserved to a variable 

 extent on all sides of the 

 mound, but the best examples, 

 those shown in Figures 8, 9, 

 and 10, are on the south side. 

 In the re-entrant between two 

 of the outcurving heads, partly 

 covered by loose debris, a 

 boulder was found fitting closely into one of the grooves. The 

 side of the boulder next to the grooved surface was shaped to fit the 

 groove as though it had been shoved along the groove by some semi- 

 rigid body, such as ice, moving along the mountain side. 



The continuity of the grooves and striae about the outcurving 

 heads and back into the re-entrants seems fairly well indicated in 

 Figure 11. The grooved wall shown has a height of about 20 feet 

 and as many as 50 or 60 distinct grooves and striae are observable 



Fig. 9. — View of grooved granite 



