Plate 7 



Glacial pcljble from left bank of Saranac river about i mile above Platts- 

 burg. Taken from the till close upon the li^laciated bed rock. It shows a 

 scries of fine parallel striae made by sand grains lyinc? between it and the 

 bed rock and the usual irregular scratches and incisions caused by rubbin<r 

 against other blocks in the till. 



