RELICS OF MAN IN THE GLACIAL PERIOD. 295 



It was under this mountain of lava that the numerous 

 implements and remains of man occurred which were 

 reported to Professor J. D. Whitney when he was con- 

 ducting the geological survey of California between 1860 



and 1870. The implements consisted of stone mortars 

 and pestles, suitable for use in grinding acorns and other 

 coarse articles of food. There were, however, some rude 

 articles of ornament. In one of the mining shafts pene- 



