﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  261 
  

  

  In 
  places 
  the 
  rock 
  shows 
  a 
  dip 
  of 
  between 
  2° 
  and 
  2J° 
  S 
  about 
  

   40° 
  W. 
  

  

  The 
  Dormansville 
  quarries 
  were 
  mentioned 
  by 
  Darton 
  who 
  

   states 
  that 
  they 
  " 
  are 
  in 
  a 
  bed 
  about 
  10 
  feet 
  thick 
  which 
  yielded 
  

   a 
  very 
  large 
  amount 
  of 
  excellent 
  flagging."* 
  Darton 
  divided 
  the 
  

   Hamilton 
  of 
  Albany 
  co. 
  into 
  two 
  divisions, 
  the 
  lower 
  one 
  600 
  

   feet 
  in 
  thickness, 
  which 
  he 
  called 
  the 
  " 
  Hamilton 
  black 
  shales 
  " 
  

   and 
  the 
  upper 
  one 
  the 
  " 
  Hamilton 
  flags 
  and 
  shales 
  " 
  700 
  feet 
  in 
  

   thickness. 
  He 
  considered 
  that 
  "The 
  beds 
  of 
  flags 
  are 
  not 
  at 
  any 
  

   definite 
  horizon, 
  though 
  the 
  greater 
  amount 
  of 
  flag 
  which 
  has 
  

   been 
  worked 
  is 
  from 
  beds 
  about 
  250 
  feet 
  above 
  the 
  base 
  of 
  the 
  

   series 
  [his 
  upper 
  division]. 
  . 
  . 
  The 
  lower 
  portion 
  of 
  the 
  forma- 
  

   tion 
  is 
  sparingly 
  f 
  ossilif 
  erous, 
  particularly 
  some 
  of 
  the 
  softer 
  

   thinner 
  flags, 
  which 
  yield 
  a 
  Hamilton 
  group 
  fauna. 
  The 
  upper 
  

   beds 
  of 
  the 
  series 
  may 
  extend 
  above 
  the 
  limits 
  of 
  the 
  Hamilton 
  

   group 
  of 
  western 
  New 
  York, 
  but 
  I 
  have 
  at 
  present 
  no 
  definite 
  

   evidence 
  on 
  this 
  point." 
  a 
  

  

  It 
  seems 
  that 
  all 
  of 
  the 
  important 
  flagstone 
  quarries 
  of 
  Albany 
  

   county 
  are 
  in 
  the 
  Hamilton 
  formation, 
  as 
  stated 
  above, 
  but 
  it 
  will 
  

   be 
  shown 
  that 
  farther 
  south 
  in 
  Greene 
  and 
  Ulster 
  counties 
  many 
  

   of 
  the 
  large 
  quarries 
  are 
  above 
  the 
  Hamilton 
  and 
  in 
  the 
  Sher- 
  

   burne 
  formation. 
  Again 
  the 
  writer 
  considers 
  that 
  in 
  Albany 
  

   county 
  the 
  upper 
  portion 
  of 
  Darton's 
  " 
  Hamilton 
  flags 
  and 
  shales 
  " 
  

   are 
  above 
  the 
  top 
  of 
  the 
  Hamilton 
  as 
  he 
  thought 
  they 
  might 
  be 
  

   and 
  in 
  the 
  Sherburne 
  formation. 
  

  

  On 
  the 
  hill 
  east 
  of 
  Basic 
  creek 
  and 
  some 
  three 
  miles 
  northeast 
  

   of 
  South 
  Westerlo 
  is 
  a 
  prominent 
  ledge 
  (XXX 
  D 
  3 
  ) 
  of 
  massive 
  red 
  

   sandstone 
  five 
  feet 
  in 
  thickness. 
  The 
  surface 
  is 
  very 
  irregular 
  as 
  

   though 
  it 
  had 
  been 
  worn 
  by 
  the 
  ice. 
  In 
  the 
  field 
  to 
  the 
  east 
  of 
  

   the 
  highway 
  is 
  a 
  ledge 
  some 
  15 
  feet 
  in 
  thickness. 
  At 
  the 
  base 
  is 
  

   apparently 
  a 
  stratum 
  of 
  fed 
  sandstone, 
  then 
  there 
  are 
  bluish 
  gray 
  

   sandstones 
  which 
  are 
  capped 
  by 
  red 
  somewhat 
  irregularly 
  bedded 
  

   sandstones. 
  In 
  the 
  southeastern 
  part 
  of 
  the 
  township 
  about 
  three 
  

   miles 
  east 
  of 
  South 
  Westerlo 
  are 
  coarse, 
  arenaceous 
  shales 
  and 
  

  

  a 
  13th 
  annual 
  report 
  N. 
  Y. 
  state 
  geologist, 
  p. 
  241. 
  

  

  