208 NEW YORK STATE MUSEUM 



cealed by beds of Potsdam sandstone. The rock is a compact 

 lustrous serpentine of light green color with scattered grains of 

 black iron ore and flecks and clouds of the red oxide. The appear- 

 ance is quite ornamental and such as to make the serpentine well 

 adapted for polished work if sufficiently large pieces were obtain- 

 able. In the exposed section the rock is badly broken so that only 

 blocks of small size can be secured, but it is quite likely that better 

 material would be found deeper in the bank beyond the limits of 

 frost action. 



