﻿148 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  4 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall 
  

  

  5 
  Glyptodesma 
  erectum 
  (Con.) 
  Hall 
  

  

  6 
  Grammysia 
  Usulcata 
  (Con.) 
  Hall 
  

  

  7 
  G. 
  (Sphenomya) 
  ctmeata 
  Hall 
  

  

  8 
  Modiomorpha 
  subalata 
  (Con.) 
  Hall 
  (?) 
  

  

  9 
  Palaeoneilo 
  constricta 
  (Con.) 
  Hall 
  

  

  10 
  Pleurotomaria 
  sulcomarginata 
  Con. 
  (?) 
  

  

  11 
  Planolites 
  clarkii, 
  sp. 
  nov. 
  

  

  (c) 
  

   (r) 
  

   « 
  

   (rr) 
  

   (rr) 
  

   (rr) 
  

   (rr) 
  

  

  (o) 
  

  

  This 
  quarry 
  is 
  referred 
  to 
  the 
  Hamilton 
  formation 
  although 
  

   near 
  its 
  summit, 
  for 
  it 
  is 
  thought 
  that 
  the 
  top 
  of 
  the 
  hill 
  is 
  in 
  

   the 
  base 
  of 
  the 
  Sherburne 
  formation. 
  A 
  view 
  of 
  the 
  wall 
  of 
  this 
  

   quarry 
  and 
  another 
  of 
  the 
  dump 
  heap 
  were 
  given 
  in 
  part 
  1 
  of 
  this 
  

   report 
  on 
  plates 
  7 
  and 
  8. 
  

  

  SECTION 
  OF 
  HILL 
  AT 
  SILVERNAILE 
  QUARRY 
  

  

  220' 
  

  

  165' 
  

  

  157' 
  

  

  107' 
  

  

  ; 
  

  

  55' 
  

  

  8' 
  

  

  50 
  7 
  

  

  107' 
  

  

  Top 
  of 
  hill 
  

  

  D 
  4 
  Covered 
  

  

  Sherburne 
  {? 
  

  

  D 
  3 
  Silvern 
  aile 
  quarry 
  

  

  Hamilton 
  

  

  D 
  2 
  Shales 
  with 
  Hamilton 
  fossils 
  

  

  D 
  1 
  Covered 
  

  

  Level 
  of 
  jroad 
  in 
  valley 
  

  

  