﻿312 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  CONCLUSION 
  

  

  In 
  the 
  conclusion 
  of 
  part 
  1 
  of 
  this 
  report 
  some 
  general 
  results 
  

   were 
  stated, 
  but 
  it 
  is 
  now 
  thought 
  best 
  to 
  summarize 
  very 
  briefly 
  

   alj 
  the 
  important 
  results 
  of 
  this 
  investigation. 
  

  

  1 
  It 
  was 
  shown 
  that 
  from 
  Cortland 
  county 
  east 
  across 
  Che- 
  

   nango, 
  Otsego 
  and 
  Schoharie 
  counties 
  the 
  line 
  marking 
  the 
  upper 
  

   boundary 
  of 
  the 
  Hamilton 
  formation 
  is 
  from 
  5 
  to 
  15 
  miles 
  farther 
  

   north 
  a 
  than 
  it 
  was 
  drawn 
  on 
  the 
  Preliminary 
  geologic 
  map 
  of 
  New 
  

   York. 
  

  

  2 
  The 
  Tully 
  limestone 
  extends 
  eastward 
  to 
  Smyrna 
  in 
  the 
  Che- 
  

   nango 
  valley 
  and 
  of 
  course 
  for 
  that 
  distance 
  clearly 
  indicates 
  

   the 
  top 
  of 
  the 
  Hamilton 
  formation. 
  Above 
  the 
  limestone 
  at 
  

   Smyrna 
  is 
  the 
  Genesee 
  slate 
  nearly 
  30 
  feet, 
  thick 
  which 
  was 
  not 
  

  

  . 
  clearly 
  recognized 
  to 
  the 
  east 
  of 
  the 
  Chenango 
  river. 
  

  

  3 
  The 
  horizon 
  of 
  the 
  Tully 
  limestone 
  is 
  indicated 
  in 
  New 
  Lis- 
  

   bon 
  township 
  in 
  the 
  southern 
  part 
  of 
  Otsego 
  county 
  by 
  the 
  occur- 
  

   rence 
  of 
  its 
  characteristic 
  fossil 
  Rhynchonella 
  (Hypothyris) 
  venus- 
  

   tula 
  Hall. 
  This 
  discovery 
  extends 
  the 
  distribution 
  of 
  the 
  species 
  

   30 
  miles 
  farther 
  southeast 
  than 
  heretofore 
  reported. 
  

  

  4 
  Succeeding 
  the 
  Tully 
  limestone 
  and 
  Genesee 
  slate, 
  or 
  farther 
  

   east 
  where 
  these 
  formations 
  have 
  disappeared, 
  the 
  Hamilton 
  

   formation, 
  is 
  a 
  mass 
  of 
  thin 
  bluish 
  sandstones 
  and 
  smooth 
  shales 
  

   of 
  Portage 
  age, 
  for 
  which 
  Vanuxem 
  proposed 
  the 
  name 
  " 
  Sher- 
  

   burne 
  flagstone 
  " 
  which 
  has 
  been 
  adopted 
  and 
  used 
  as 
  the 
  name 
  for 
  

   the 
  formation. 
  It 
  has 
  a 
  thickness 
  of 
  250 
  feet 
  in 
  the 
  Chenango 
  

   valley 
  and 
  may 
  be 
  readily 
  traced 
  westward 
  to 
  the 
  meridian 
  of 
  

   Cayuga 
  lake, 
  west 
  of 
  which 
  Prof. 
  J. 
  M. 
  Clarke 
  has 
  shown 
  that 
  it 
  

   gradually 
  passes 
  into 
  the 
  Naples 
  beds. 
  Eastward 
  from 
  the 
  Che- 
  

   nango 
  valley 
  the 
  Sherburne 
  formation 
  crosses 
  Chenango, 
  Otsego 
  and 
  

   Schoharie 
  counties, 
  entering 
  Albany 
  co. 
  where 
  it 
  turns 
  south- 
  

   southwesterly, 
  and 
  apparently 
  extends 
  to 
  the 
  Delaware 
  -river 
  

   crossing 
  Greene, 
  Ulster, 
  Sullivan 
  and 
  Orange 
  counties. 
  Where 
  

   the 
  Sherburne 
  formation 
  is 
  separated 
  from 
  the 
  Hamilton 
  by 
  the 
  

  

  a 
  By 
  a 
  typographical 
  error 
  on 
  p. 
  220 
  of 
  part 
  1 
  of 
  this 
  report 
  the 
  writer 
  was 
  made 
  to 
  say 
  south 
  in- 
  

   stead 
  of 
  north, 
  but 
  from 
  the 
  numerous 
  statements 
  in 
  the 
  descriptive 
  portion 
  of 
  the 
  paper 
  concerning 
  

   this 
  boundary 
  the 
  mistake 
  would 
  be 
  apparent 
  to 
  one 
  specially 
  interested. 
  

  

  