﻿102 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  9 
  Leptodesma 
  sociale 
  Hall 
  (rr)^ 
  

  

  10 
  Lyriopecten 
  tricostatus 
  (Van.) 
  Hall 
  (it) 
  

  

  11 
  Bellerophon 
  maera 
  Hall 
  (it) 
  

  

  12 
  Pleurotomaria 
  sp. 
  (it) 
  

  

  Very 
  imperfectly 
  preserved. 
  

  

  13 
  Orthoceras 
  leander 
  Hall 
  (?) 
  (rr) 
  

  

  14 
  Modiomorpha, 
  quadrula 
  Hall 
  (rr) 
  

  

  The 
  rocks 
  described 
  above, 
  from 
  along 
  Bump's 
  creek, 
  are 
  in 
  the 
  

   lower 
  part 
  of 
  the 
  Chemung 
  as 
  it 
  has 
  been 
  defined 
  in 
  this 
  report 
  

   and 
  this 
  creek 
  together 
  with 
  the 
  one 
  at 
  Bainbridge 
  affords 
  a 
  

   fair 
  opportunity 
  for 
  the 
  examination 
  of 
  this 
  part 
  of 
  that 
  forma- 
  

   tion. 
  The 
  creek 
  valley 
  was 
  followed 
  from 
  above 
  B 
  4 
  at 
  the 
  saw 
  

   mill 
  to 
  a 
  point 
  near 
  the 
  township 
  line 
  between 
  Afton 
  and 
  

   Coventry; 
  but 
  it 
  is 
  fairly 
  broad 
  and 
  somewhat 
  marshy 
  and 
  the 
  

   rocks 
  are 
  covered 
  with 
  drift 
  so 
  that 
  no 
  further 
  exposures 
  of 
  any 
  

   importance 
  were 
  seen. 
  

  

  LXX 
  A 
  1 
  . 
  To 
  the 
  north 
  of 
  Harpersville 
  is 
  a 
  brook 
  whose 
  souther- 
  

   ly 
  course 
  is 
  near 
  the 
  township 
  line 
  between 
  Afton 
  and 
  Colesville. 
  

   On 
  the 
  bank, 
  a 
  short 
  distance 
  above 
  the 
  iron 
  railroad 
  bridge 
  on 
  

   the 
  Binghamton 
  division 
  of 
  the 
  Delaware 
  and 
  Hudson 
  railroad, 
  

   are 
  olive 
  shales, 
  most 
  of 
  which 
  are 
  somewhat 
  arenaceous, 
  and 
  

   sandstones 
  which 
  are 
  mainly 
  in 
  a 
  contorted 
  layer. 
  

  

  The 
  base 
  of 
  the 
  exposure 
  is 
  about 
  70 
  feet 
  below 
  the 
  Harpers- 
  

   ville 
  station 
  and 
  only 
  a 
  few 
  feet 
  lower 
  than 
  that 
  at 
  Aftom 
  

   Spirifer 
  mucronatus 
  (Con.) 
  Bill. 
  var. 
  posterus 
  H. 
  & 
  C. 
  is 
  common 
  

   in 
  these 
  shales 
  while 
  in 
  loose 
  blocks 
  along 
  the 
  creek 
  are 
  numerous 
  

   specimens 
  of 
  Spirifer 
  mesastrialis 
  Hall. 
  The 
  following 
  additional 
  

   species 
  were 
  found 
  in 
  the 
  loose 
  pieces 
  : 
  

  

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

  

  var. 
  posterus 
  H. 
  & 
  C. 
  

  

  2 
  Productella 
  laclirymosa 
  (Con.) 
  Hall 
  (r). 
  

  

  3 
  GamarotoecMa 
  cf. 
  congregata 
  (Con.) 
  H. 
  & 
  C. 
  (c) 
  

  

  4 
  Grammysia 
  communis 
  Hall 
  (rr) 
  

  

  LXX 
  A 
  3 
  . 
  Farther 
  up 
  the 
  stream 
  and 
  40 
  feet 
  above 
  the 
  base 
  of 
  

   A 
  1 
  is 
  an 
  exposure 
  of 
  greenish 
  to 
  olive 
  sandstone 
  on 
  the 
  bank 
  of 
  

  

  