﻿310 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  and 
  an 
  account 
  of 
  its 
  geology 
  which 
  is 
  most 
  interesting 
  has 
  been 
  

   described 
  in 
  an 
  earlier 
  work 
  by 
  the 
  writer." 
  To 
  the 
  northwest 
  

   o 
  + 
  ' 
  Port 
  Jervis 
  are 
  frequent 
  outcrops 
  of 
  Hamilton 
  shales 
  and 
  sand- 
  

   stones 
  which 
  contain 
  an 
  abundant 
  fauna, 
  and 
  some 
  of 
  these 
  were 
  

   described 
  in 
  the 
  work 
  mentioned 
  above. 
  6 
  

  

  On 
  the 
  Pennsylvania 
  side 
  of 
  the 
  Delaware 
  river 
  below 
  the 
  Erie 
  

   railroad 
  bridge 
  four 
  miles 
  above 
  Port 
  Jervis 
  are 
  thin 
  blue 
  sand- 
  

   stones 
  alternating 
  with 
  bluish, 
  rather 
  arenaceous 
  shales. 
  Some 
  

   of 
  the 
  sandstone 
  layers 
  have 
  a 
  warped 
  or 
  undulating 
  structure 
  

   and 
  there 
  are 
  concretionary 
  layers. 
  Fossils 
  are 
  rare 
  and 
  this 
  

   sandstone 
  lithologically 
  resembles 
  the 
  Sherburne 
  flags 
  of 
  Ulster 
  

   co. 
  to 
  which 
  formation 
  these 
  rocks 
  are 
  referred. 
  Above 
  the 
  

   Erie 
  railroad 
  bridge 
  both 
  on 
  the 
  river 
  bank 
  and 
  in 
  the 
  cut 
  near 
  

   the 
  91st 
  mile 
  post 
  are 
  bluish 
  sandstones 
  and 
  shales 
  which 
  contain 
  

   a 
  fauna 
  similar 
  to 
  that 
  of 
  the 
  Ithaca 
  formation 
  in 
  Schoharie 
  and 
  

   Otsego 
  counties, 
  to 
  which 
  these 
  rocks 
  are 
  referred; 
  On 
  the 
  bank 
  

   of 
  the 
  river 
  at 
  Mill 
  rift 
  in 
  bluish 
  thin 
  bedded 
  sandstones 
  to 
  shales 
  

   the 
  following 
  species 
  were 
  collected. 
  A 
  thin 
  layer 
  of 
  the 
  bluish 
  

   shales 
  contains 
  more 
  abundant 
  fossils 
  than 
  the 
  other 
  rocks, 
  

   specially 
  Paracyclas 
  Virata 
  (Con.) 
  Hall 
  and 
  other 
  Lamellibranch 
  

   shells. 
  A 
  sort 
  of 
  concretionary 
  stratum 
  not 
  much 
  above 
  the 
  

   water 
  level 
  at 
  low 
  tide 
  contains 
  fragments 
  of 
  fish 
  bones 
  asso- 
  

   ciated 
  with 
  Spirifers. 
  The 
  list 
  is: 
  

  

  1 
  Spirifer 
  mucrcmatus 
  (Con.) 
  Bill. 
  (a) 
  

  

  2 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall 
  (rr) 
  

  

  3 
  CJionetes 
  setigera 
  Hall 
  (rr) 
  

  

  4 
  C. 
  lepida 
  Hall 
  (rr) 
  

  

  5 
  Camarotoechia 
  eximia 
  (Hall) 
  H. 
  & 
  C. 
  (?) 
  (rr) 
  

  

  6 
  Liorhynchus 
  mesacostalis 
  Hall 
  (rr) 
  

  

  7 
  Paracyclas 
  lirwta 
  (Con.) 
  Hall 
  (c) 
  

  

  8 
  Microdon 
  (Cypricardvlla) 
  gregarias 
  Hall 
  (c) 
  

  

  9 
  Goniophora 
  carinata 
  (Con.) 
  Hall 
  (rr) 
  

  

  10 
  Glossites 
  depressus 
  Hall 
  (?) 
  (rr) 
  

  

  11 
  Actinopteria 
  boydi 
  (Con.) 
  Hall 
  (rr) 
  

  

  a 
  Bull. 
  U. 
  S. 
  geol. 
  surv. 
  no. 
  120, 
  p. 
  34-39. 
  

   b 
  Ibid 
  p. 
  39-42. 
  

  

  