﻿Report 
  of 
  the 
  State 
  Geologist. 
  

  

  467 
  

  

  be 
  sufficient 
  or 
  the 
  production 
  of 
  small 
  sags, 
  shown 
  in 
  fig. 
  5, 
  if 
  

   the 
  sand 
  removed 
  be 
  less 
  in 
  quantity. 
  

  

  ■flow 
  of 
  t&e. 
  clay. 
  

  

  From 
  what 
  has 
  been 
  said 
  of 
  the 
  relation 
  of 
  the 
  clays 
  to 
  the 
  

   gravel 
  beds 
  as 
  well 
  as 
  the 
  limitations 
  in 
  extent 
  toward 
  the 
  

   Helderberg 
  mountains, 
  it 
  may 
  be 
  inferred 
  that 
  clays 
  will 
  

   be 
  found 
  throughout 
  this 
  vallev. 
  This 
  is 
  no 
  doubt 
  true. 
  

   Stratified 
  blue 
  clay 
  underlying 
  yellow 
  clay 
  may 
  be 
  seen 
  in 
  the 
  

   public 
  road 
  near 
  Feura 
  Bush, 
  a 
  station 
  on 
  the 
  West 
  Shore 
  rail- 
  

   road. 
  In 
  many 
  places 
  west 
  of 
  Albany 
  wells 
  ten 
  or 
  fifteen 
  feet 
  

   deep 
  or 
  less 
  are 
  dug 
  in 
  the 
  sand 
  and 
  have 
  an 
  abundant 
  supply 
  of 
  

   water. 
  This 
  could 
  only 
  happen 
  when 
  the 
  sand 
  was 
  under- 
  

   laid 
  either 
  by 
  clay 
  or 
  some 
  other 
  impervious 
  stratum. 
  In 
  

   these 
  cases 
  there 
  is 
  direct 
  evidence 
  that 
  this 
  stratum 
  is 
  clay. 
  

   There 
  are 
  deep 
  gullies 
  with 
  rather 
  steep 
  slopes 
  running 
  

   through 
  the 
  fields. 
  The 
  sides 
  and 
  bottoms 
  of 
  these 
  slopes 
  

   are 
  usually 
  wet 
  and 
  ploughing 
  shows 
  a 
  clayey 
  soil, 
  which 
  

   is 
  probably 
  a 
  wash 
  from 
  the 
  clay 
  strata. 
  Sometimes 
  traces 
  

   of 
  lamination 
  are 
  visible. 
  In 
  places 
  there 
  is 
  no 
  doubt 
  but 
  

   the 
  clay 
  will 
  be 
  found 
  to 
  be 
  "pockety," 
  inclosed 
  in 
  small 
  hollows 
  

   in 
  the 
  rock 
  or 
  san 
  

  

  In 
  the 
  city 
  of 
  Albany 
  are 
  extensive 
  areas 
  of 
  clay 
  of 
  great 
  

   thickness. 
  From 
  North 
  Albany 
  the 
  Xew 
  York 
  Central 
  railroad 
  

   tracks 
  are 
  laid 
  on 
  clay 
  for 
  a 
  distance 
  of 
  1300 
  feet. 
  South 
  of 
  the 
  

   tracks 
  are 
  other 
  heavy 
  banks 
  as 
  yet 
  untouched. 
  On 
  Ten 
  Broeck 
  

  

  