﻿CLASSIFICATION, 
  ETC. 
  OP 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  309 
  

  

  The 
  exposures 
  on 
  Prospect 
  hill 
  to 
  the 
  west 
  of 
  the 
  Neversink 
  

   river 
  show 
  that 
  the 
  modified 
  Ithaca 
  fauna 
  as 
  found 
  in 
  Schoharie 
  

   county 
  is 
  reappearing 
  above 
  the 
  regular 
  Hamilton 
  fauna. 
  From 
  

   Albany 
  to 
  Orange 
  county 
  between 
  the 
  regular 
  Hamilton 
  fauna 
  

   and 
  the 
  lowest 
  reds 
  there 
  is 
  hardly 
  any 
  trace 
  of 
  the 
  Ithaca 
  fauna. 
  

   The 
  explanation 
  being, 
  apparently, 
  that 
  the 
  reds 
  appeared 
  as 
  

   early 
  in 
  time 
  as 
  the 
  Ithaca 
  and 
  so 
  drove 
  out 
  the 
  fauna 
  of 
  that 
  

   time. 
  But 
  from 
  Orange 
  co. 
  to 
  the 
  southwest 
  across 
  north- 
  

   eastern 
  Pennsylvania 
  the 
  base 
  of 
  the 
  reds 
  was 
  apparently 
  later 
  

   in 
  time, 
  and 
  the 
  modified 
  Ithaca 
  fauna 
  flourished 
  in 
  this 
  region. 
  

   This 
  is 
  well 
  shown 
  by 
  the 
  various 
  lists 
  of 
  fossils 
  published 
  several 
  

   years 
  ago 
  by 
  the 
  writer, 
  though 
  at 
  that 
  time 
  he 
  termed 
  the 
  

   formation 
  the 
  lower 
  Portage/ 
  1 
  and 
  his 
  discussion 
  of 
  the 
  correla- 
  

   tion 
  adopted 
  by 
  the 
  second 
  geological 
  survey 
  of 
  Pennsylvania. 
  

  

  Along 
  the 
  road 
  across 
  the 
  top 
  of 
  Prospect 
  hill 
  there 
  are 
  plenty 
  

   of 
  outcrops 
  of 
  thin 
  bedded, 
  bluish 
  gray, 
  micaceous 
  sandstones 
  

   which 
  are 
  in 
  the 
  Sherburne 
  or 
  Ithaca 
  formation. 
  No 
  fossils 
  were 
  

   found 
  on 
  a 
  hasty 
  examination, 
  and 
  no 
  reds 
  were 
  seen 
  in 
  place, 
  

   showing 
  that 
  the 
  base 
  of 
  the 
  Catskill 
  is 
  farther 
  to 
  the 
  west. 
  

   Along 
  the 
  lower 
  part 
  of 
  the 
  hill 
  road 
  to 
  the 
  northwest 
  of 
  Hugue- 
  

   not 
  are 
  blue 
  fossiliferous 
  shales 
  of 
  the 
  Hamilton 
  formation. 
  

  

  The 
  western 
  side 
  of 
  the 
  Neversink 
  valley 
  for 
  some 
  miles 
  above 
  

   Port 
  Jervis 
  as 
  well 
  as 
  the 
  Pennsylvania 
  side 
  of 
  the 
  Delaware 
  

   valley 
  below 
  Port 
  Jervis 
  is 
  bounded 
  by 
  a 
  line 
  of 
  high 
  and 
  precipi- 
  

   tous 
  hills. 
  The 
  greater 
  part 
  of 
  the 
  ridge 
  is 
  composed 
  of 
  Hamilton 
  

   rocks 
  with 
  an 
  occasional 
  outcrop 
  of 
  Marcellus 
  shale 
  at 
  its 
  base. 
  

   The 
  dip 
  is 
  strongly 
  westerly 
  as 
  is 
  clearly 
  shown 
  by 
  the 
  lines 
  of 
  

   the 
  more 
  massive 
  sandstones 
  where 
  the 
  Delaware 
  river 
  has 
  cut 
  

   through 
  the 
  ridge 
  to 
  the 
  northwest 
  of 
  Port 
  Jervis 
  and 
  Matamoras. 
  

   In 
  northeastern 
  Pennsylvania 
  a 
  number 
  of 
  streams 
  have 
  cut 
  

   gorges 
  in 
  this 
  ridge, 
  forming 
  falls 
  and 
  showing 
  the 
  rocks 
  

   in 
  an 
  admirable 
  manner 
  for 
  geological 
  study. 
  One 
  of 
  these 
  

   glens 
  in 
  the 
  Sawkill 
  at 
  Milford 
  is 
  shown 
  in 
  one 
  of 
  our 
  plates. 
  

  

  a 
  Am. 
  jour, 
  science 
  3d 
  ser. 
  46:212, 
  and 
  Bull. 
  U. 
  S. 
  geol. 
  surv. 
  no. 
  120. 
  

  

  