﻿KEPORT 
  OF 
  THE 
  DIKECTOK 
  r29 
  

  

  well 
  preserved 
  fossils. 
  These 
  evidently 
  represent 
  the 
  base 
  of 
  

  

  the 
  Trenton. 
  12 
  feet 
  

  

  Rafinesquina 
  alternata 
  (Emmons) 
  

  

  Dalmanella 
  testudinaria 
  (Dalman) 
  

  

  Crinoidal 
  columns 
  

  

  Zygosjpira 
  exigua 
  (Hall) 
  

  

  Orthoceras 
  sp. 
  

  

  The 
  Boonville 
  section 
  is 
  not 
  continuous 
  above 
  this, 
  but 
  exposures 
  

   occur 
  at 
  intervals 
  along 
  the 
  canal, 
  Sugar 
  river, 
  and 
  its 
  tributaries, 
  

   as 
  far 
  as 
  the 
  road 
  between 
  Boonville 
  and 
  Leyden, 
  while 
  far 
  beyond 
  

   this 
  is 
  a 
  single 
  outcrop 
  of 
  Utica 
  slate, 
  (141 
  A) 
  further 
  east 
  than 
  is 
  indi- 
  

   cated 
  on 
  Prof. 
  Hall's 
  map. 
  

  

  Lyon 
  Falls. 
  From 
  Leyden 
  to 
  Port 
  Leyden 
  and 
  thence 
  nearly 
  

   to 
  the 
  point 
  where 
  the 
  Black 
  river 
  canal 
  leaves 
  the 
  river, 
  no 
  

   sedimentary 
  outcrops 
  are 
  seen, 
  the 
  surface 
  being 
  buried 
  in 
  sand 
  hills. 
  

   At 
  the 
  locality 
  mentioned, 
  an 
  escarpment 
  of 
  Black 
  river 
  limestone 
  

   appears 
  (142 
  A 
  1-2), 
  forming, 
  as 
  it 
  were, 
  at 
  a 
  height 
  of 
  at 
  least 
  150 
  

   feet 
  above 
  the 
  river, 
  a 
  retaining 
  wall 
  for 
  the 
  level 
  country 
  extend- 
  

   ing 
  westward 
  at 
  that 
  higher 
  altitude. 
  The 
  strata 
  exposed 
  in 
  the 
  

   escarpment 
  at 
  the 
  top 
  of 
  the 
  slope 
  are 
  about 
  20 
  feet 
  thick. 
  The 
  

   lower 
  portion 
  (142 
  A 
  1) 
  is 
  a 
  rather 
  compact, 
  dark 
  gray 
  limestone 
  (142 
  

   A 
  2) 
  with 
  numerous 
  calcite 
  veinjngs, 
  containing 
  Lejyerditia 
  fahulites 
  

   and 
  Isotelus 
  gigas. 
  The 
  upper 
  portion 
  is 
  more 
  impure. 
  

  

  A 
  continuation 
  of 
  the 
  same 
  escarpment 
  of 
  about 
  the 
  same 
  

   thickness 
  is 
  seen 
  west 
  of 
  the 
  railroad 
  station 
  at 
  Lyon 
  Falls 
  (143 
  E 
  

   1-2). 
  The 
  lower 
  portion 
  is 
  a 
  bed 
  of 
  Leperditia 
  fabulites 
  (Conrad) 
  

   with 
  Isotehos 
  gigas 
  De 
  Kay, 
  as 
  in 
  the 
  (142 
  A) 
  locality. 
  The 
  upper 
  

   is 
  a 
  dove 
  colored 
  limestone 
  with 
  pyrite. 
  In 
  neither 
  locality 
  are 
  

   the 
  adjacent 
  formations 
  seen. 
  

  

  TRENTON 
  FORMATION 
  

  

  Rathbone 
  brook. 
  As 
  above 
  mentioned 
  (p. 
  r27) 
  the 
  sequence 
  of 
  the 
  

   beds 
  from 
  Black 
  river 
  to 
  Trenton 
  is 
  not 
  show^n 
  in 
  the 
  Rathbone 
  brook 
  

   section. 
  The 
  following 
  zones 
  may 
  be 
  established 
  by 
  correlation 
  of 
  

   the 
  details 
  in 
  the 
  writer's 
  previous 
  paper 
  (White 
  '96, 
  p. 
  84-87), 
  

   those 
  at 
  the 
  base 
  of 
  the 
  brook 
  section 
  being 
  compared 
  with 
  those 
  on 
  

   the 
  neighboring 
  hillside. 
  

  

  