﻿416 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum, 
  

  

  observations 
  have 
  extended 
  this 
  knowledge 
  over 
  the 
  entire 
  belt 
  in 
  

   New 
  York, 
  although 
  I 
  ha^e 
  not 
  studied 
  the 
  details 
  of 
  all 
  the 
  

   localities 
  with 
  such 
  care 
  as 
  I 
  desired. 
  I 
  have 
  also 
  examined 
  some 
  

   features 
  of 
  several 
  overlaps 
  at 
  higher 
  horizons 
  westward. 
  

  

  The 
  general 
  relations 
  are 
  shown 
  in 
  plate 
  1 
  and 
  the 
  following 
  

   figure. 
  The 
  contacts 
  along 
  the 
  overlaps 
  unfortunately 
  are 
  rela- 
  

   tively 
  seldom 
  exposed, 
  for 
  they 
  are 
  unusually 
  obscured 
  by 
  talus 
  

   from 
  cliffs 
  of 
  overlying 
  limestones, 
  and 
  road 
  cuts 
  afford 
  the 
  prin- 
  

   cipal 
  exposures. 
  The 
  aggregate 
  number 
  of 
  contacts 
  which 
  I 
  

   observed 
  was 
  considerable, 
  and 
  I 
  found 
  many 
  outcrops 
  in 
  which 
  

   the 
  vicinity 
  of 
  the 
  contacts 
  was 
  exposed. 
  

  

  Fig. 
  2 
  — 
  Diagram 
  illustrating 
  the 
  stratigraphic 
  relations 
  of 
  the 
  upper 
  Silurian 
  members 
  below 
  

   the 
  base 
  of 
  the 
  Helderberg 
  foroation 
  from 
  Utica 
  to 
  Ellen 
  ville. 
  Datum 
  plane 
  is 
  at 
  base 
  of 
  

   Helderberg 
  formation. 
  S., 
  Salina 
  formation; 
  C, 
  Clinton 
  formation; 
  O., 
  Oneida-Medina; 
  

   H., 
  Hudson 
  river 
  formation. 
  Vertical 
  scale 
  greatly 
  exaggerated. 
  Dip 
  is 
  apparently 
  only 
  in 
  

   Rondout 
  to 
  Rosendale 
  region. 
  

  

  Coming 
  eastward 
  from 
  LTtica 
  the 
  Niagara 
  limestone 
  runs 
  out 
  

   first, 
  then 
  the 
  Oneida-Medina 
  beds, 
  then 
  the 
  Clinton, 
  and 
  finally 
  

   the 
  Salina 
  shales 
  just 
  east 
  of 
  Sharon 
  Springs. 
  I 
  did 
  not 
  study 
  

   the 
  contacts 
  in 
  this 
  belt 
  but 
  it 
  was 
  very 
  apparent 
  that 
  the 
  forma- 
  

   tions 
  do 
  not 
  merge 
  into 
  each 
  other 
  or 
  the 
  Hudson 
  river 
  formation 
  

   below. 
  The 
  Eiagara 
  and 
  Clinton 
  outcrops 
  extending 
  from 
  

   Howe's 
  Cave 
  to 
  Schoharie 
  present 
  no 
  special 
  evidence 
  of 
  uncon- 
  

   formity 
  except 
  abrupt 
  breaks 
  in 
  stratigraphic 
  continuity 
  by 
  

   which 
  they 
  are 
  separated 
  from 
  each 
  other 
  and 
  from 
  the 
  adjoining 
  

   formations. 
  In 
  the 
  Helderberg 
  mountains 
  at 
  Indian 
  Ladder, 
  the 
  

   contact 
  was 
  observed 
  and 
  there 
  is 
  perfect 
  conformity 
  in 
  bedding, 
  

   but 
  the 
  basal 
  limestone 
  bed 
  although 
  quite 
  impure 
  was 
  sharply 
  

   demarked 
  by 
  its 
  entire 
  dissimilarity 
  from 
  the 
  underlying 
  slate. 
  

   Just 
  southwest 
  of 
  New 
  Salem 
  the 
  immediate 
  vicinity 
  of 
  the 
  con- 
  

   tact 
  was 
  found 
  at 
  a 
  spring 
  at 
  660 
  feet 
  A. 
  T. 
  and 
  perfect 
  

   conformity 
  in 
  dip 
  was 
  observed. 
  South 
  of 
  Feurabush 
  the 
  dips 
  of 
  

   slate 
  and 
  limestone 
  are 
  coincident 
  so 
  far 
  as 
  I 
  could 
  find. 
  In 
  the 
  

   flexed 
  region 
  adjoining 
  the 
  Hudson 
  river 
  southward 
  from 
  here 
  

   there 
  are 
  found 
  areas 
  of 
  conformable 
  bedding 
  merging 
  at 
  

   intervals 
  into 
  areas 
  of 
  strong 
  structural 
  unconformity. 
  

  

  