GLACIATION OF SAN FRANCISCO MOUNTAIN 279 



grooved. The stoss sides of all minor prominences on this rock are 

 characteristically worn. On the floor of the basin numbered 2, 

 there are irregular hillocks or mounds which were formed by the ice, 

 and among them were formerly small ponds or marshes. The 

 minor basins numbered 3 and 4 show little modification due to ice, 

 but it may be that the extensive talus slopes obscure the former flat 

 bottoms of these basins. No proof of more than one epoch of glacia- 

 tion was found. 



Since the melting of the ice, the amount of erosion accomplished 

 has not been great. Much of the talus material about the rim of 

 the crater is presumably of postglacial age, but the washing away of 

 the terminal moraine along the main stream is the most conspicu- 

 ous task that has been done. The surface-weathering of the glacial 

 material is so slight as to be insignificant. 



In comparison with the records of ice-action in higher latitudes 

 in this country, the records on San Francisco Mountain are meager. 

 They indicate appropriately weaker glaciation in this lower latitude. 



