﻿COHOES 
  MASTODON, 
  

  

  Fig. 
  18. 
  

  

  143 
  

  

  Fig. 
  20. 
  

  

  Fig. 
  21. 
  

  

  faults 
  in 
  beds 
  of 
  

   sand. 
  The 
  two 
  

   are 
  from 
  the 
  bot- 
  

   tom 
  of 
  the 
  escarp- 
  

   ment. 
  Fiff. 
  19 
  is 
  

   a 
  section 
  twenty 
  

   feet 
  in 
  height, 
  in 
  

   which 
  1 
  indicates 
  

   soil 
  ; 
  2, 
  yellow 
  

   clay 
  ; 
  3, 
  coarse 
  

   sand 
  ; 
  4, 
  blue 
  

   clay. 
  In 
  fig. 
  20 
  is 
  given 
  a 
  sec- 
  

   tion 
  of 
  gravel 
  and 
  sand, 
  of 
  

   seventy 
  feet 
  in 
  height, 
  showing 
  

   discordant 
  stratification. 
  Fig. 
  

   21 
  is 
  a 
  section 
  of 
  a 
  sand 
  bank, 
  

   illustrating 
  a 
  remarkable 
  con- 
  

   tortion 
  of 
  the 
  material. 
  The 
  

   above 
  are 
  all 
  from 
  the 
  same 
  

   gravel 
  banks, 
  near 
  the 
  Patroon's, 
  

   at 
  North 
  Alban}^, 
  in 
  the 
  

   end 
  of 
  a 
  range 
  of 
  drift 
  

  

  hills 
  which 
  extend 
  near- 
  

   ly 
  to 
  Cohoes. 
  Perhaps 
  

   the 
  hill 
  in 
  Waterford 
  

   belongs 
  to 
  it. 
  The 
  ap- 
  

   pended 
  section 
  (fig. 
  22) 
  

  

  is 
  exposed 
  in 
  gravel 
  banks 
  at 
  Waterford. 
  

  

  