﻿Plate 
  31 
  

  

  Upper 
  figure. 
  Hand 
  specimen 
  of 
  faulted 
  Potsdam 
  sandstone, 
  nearly- 
  

   natural 
  size. 
  The 
  rock 
  is 
  red, 
  with 
  white 
  streaks, 
  and 
  the 
  fault 
  plane 
  is 
  

   filled 
  with 
  white, 
  thoroughly 
  cemented 
  sand. 
  

  

  Lower 
  figure. 
  Hand 
  specimen 
  of 
  basal, 
  Lowville 
  conglomerate 
  from 
  

   near 
  Depauville 
  (Clayton 
  quadrangle). 
  The 
  pebbles 
  of 
  fine 
  limestone 
  

   mud, 
  of 
  dove 
  color, 
  weather 
  prominently 
  white, 
  as 
  compared 
  with 
  the 
  

   remainder 
  of 
  the 
  rock 
  surface. 
  H. 
  P. 
  Gushing, 
  photo 
  

  

  