﻿210 
  Forty- 
  seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  The 
  geology 
  of 
  the 
  locality 
  and 
  of 
  the 
  adjacent 
  country 
  will 
  

   be 
  better 
  appreciated 
  by 
  an 
  inspection 
  of 
  the 
  small 
  geological 
  

   map 
  accompanying 
  this 
  report. 
  This 
  map, 
  as 
  constructed 
  and 
  

   colored, 
  is 
  taken 
  from 
  a 
  portion 
  of 
  a 
  geological 
  map 
  of 
  the 
  

   western 
  half 
  of 
  New 
  York, 
  prepared 
  in 
  1888, 
  and 
  which 
  corres 
  

   ponds 
  very 
  nearly 
  to 
  the 
  scale 
  of 
  the 
  base 
  map 
  now 
  being 
  pre 
  

   pared 
  for 
  the 
  geological 
  map 
  of 
  the 
  State. 
  The 
  order 
  of 
  

   succession 
  among 
  the 
  formations 
  is 
  easily 
  seen, 
  the 
  Medina 
  sand 
  

   stone 
  skirting 
  Lake 
  Ontario, 
  lying 
  at 
  the 
  base 
  and 
  being 
  the 
  

   lowest 
  member 
  of 
  the 
  geological 
  series 
  exposed 
  in 
  western 
  New 
  

   York. 
  The 
  second 
  belt 
  of 
  color 
  represents 
  the 
  limits 
  of 
  the 
  

   Niagara 
  and 
  Clinton 
  groups, 
  the 
  third 
  belt 
  being 
  the 
  salt 
  group 
  

   which 
  is 
  presented 
  in 
  a 
  broad 
  outcrop 
  in 
  the 
  central 
  part 
  of 
  the 
  

   State, 
  and 
  is 
  recognized 
  as 
  beginning 
  in 
  a 
  narrow 
  belt 
  about 
  the 
  

   longitude 
  of 
  Sharon 
  Springs,* 
  and 
  extending 
  in 
  a 
  gradually 
  

   widening 
  area 
  to 
  central 
  New 
  York, 
  and 
  thence 
  in 
  a 
  slightly 
  

   narrowing 
  width 
  of 
  outcrop 
  to 
  the 
  Niagara 
  river, 
  and 
  into 
  the 
  

   province 
  of 
  Ontario.f 
  

  

  The 
  relations 
  of 
  the 
  rock 
  formations 
  will 
  be 
  best 
  understood 
  

   by 
  consulting 
  the 
  north 
  and 
  south 
  section 
  accompanying 
  this 
  

   report 
  (Diagram 
  No. 
  1), 
  and 
  also 
  the 
  east 
  and 
  west 
  section 
  

   (Diagram 
  No. 
  2), 
  which 
  is 
  intended 
  to 
  be 
  a 
  representation 
  of 
  the 
  

   northern 
  outcrop 
  of 
  all 
  the 
  formations, 
  from 
  the 
  Hudson 
  Eiver 
  

   group 
  to 
  the 
  Catskill 
  group, 
  inclusive. 
  This 
  section 
  is 
  intended 
  

   to 
  show 
  the 
  gradual 
  attenuation 
  of 
  some 
  of 
  the 
  formations 
  in 
  

   the 
  western 
  extension, 
  while 
  several 
  other 
  important 
  members 
  of 
  

   the 
  series 
  become 
  greatly 
  attenuated 
  and 
  finally 
  thin 
  out 
  entirely 
  

   in 
  their 
  eastern 
  extension. 
  

  

  * 
  The 
  Onondaga 
  salt 
  or 
  Salina 
  group, 
  in 
  its 
  upper 
  member, 
  the 
  water 
  lime, 
  extends 
  eastward 
  

   along 
  the 
  escarpment 
  of 
  Howe's 
  Cave, 
  the 
  banks 
  of 
  the 
  Schoharie 
  creek 
  and 
  the 
  Helderberg 
  

   escarpment 
  to 
  within 
  a 
  few 
  miles 
  of 
  the 
  Hudson 
  river; 
  thence 
  turning 
  southward 
  along 
  the 
  

   Hudson 
  valley 
  it 
  extends 
  to 
  the 
  southern 
  limits 
  of 
  the 
  State 
  It 
  is 
  extensively 
  quarried 
  for 
  

   hydraulic 
  cement 
  at 
  Rondout 
  and 
  vicinity, 
  and 
  especially 
  at 
  Rosendale, 
  in 
  Ulster 
  county 
  The 
  

   marly 
  portion 
  of 
  the 
  group 
  below 
  the 
  water 
  lime 
  does 
  not 
  occur 
  in 
  the 
  eastern 
  extension 
  of 
  the 
  

   formation, 
  and 
  the 
  first 
  evidence 
  of 
  the 
  presence 
  of 
  salt 
  on 
  going 
  westward 
  is 
  at 
  Salt 
  Spring 
  

   ville, 
  in 
  Otsego 
  county, 
  a 
  few 
  miles 
  north 
  of 
  Cherry 
  Valley. 
  

  

  t 
  Since 
  communicating 
  this 
  report, 
  and 
  after 
  it 
  was 
  placed 
  in 
  the 
  hands 
  of 
  the 
  State 
  Trinter, 
  is 
  

   was 
  learned 
  that 
  the 
  law 
  for 
  public 
  printing 
  does 
  not 
  provide 
  for 
  printing 
  colored 
  maps; 
  there- 
  

   fore 
  it 
  has 
  been 
  necessary 
  to 
  withdraw 
  the 
  above 
  described 
  map. 
  A 
  diagram, 
  No. 
  2, 
  with 
  a 
  

   belt 
  of 
  color, 
  indicating 
  the 
  width 
  of 
  the 
  outcrop 
  of 
  the 
  salt 
  formation 
  in 
  its 
  extension 
  from 
  a 
  

   point 
  east 
  of 
  Cherry 
  Valley 
  to 
  the 
  western 
  limits 
  of 
  the 
  State, 
  is 
  substituted 
  for 
  the 
  colored 
  

   geological 
  map. 
  The 
  position 
  of 
  this 
  outcrop 
  as 
  represented 
  upon 
  the 
  diagram, 
  when 
  com- 
  

   pared 
  with 
  the 
  north 
  and 
  south 
  section, 
  Diagram 
  No. 
  1, 
  will 
  show 
  the 
  geological 
  relations 
  of 
  

   the 
  salt 
  group 
  to 
  the 
  formations 
  above 
  and 
  below. 
  

  

  