﻿CLASSIFICATION, 
  ETC. 
  OF 
  HAMILTON 
  AND 
  CHEMUNG 
  SERIES 
  99 
  

  

  feet 
  of 
  fossiliferous 
  olive 
  shales 
  and 
  thin 
  sandstones 
  are 
  exposed 
  

   by 
  the 
  side 
  of 
  the 
  highway. 
  Only 
  a 
  brief 
  search 
  was 
  made 
  and 
  

   the 
  following 
  list 
  might 
  undoubtedly 
  be 
  increased: 
  

  

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

  

  yar. 
  posterns 
  H. 
  & 
  C. 
  

  

  2 
  Productella 
  lachrymosa 
  (Con.) 
  Hall 
  (c) 
  

  

  3 
  StropTteodonta 
  demissa 
  (Con.) 
  Hall 
  ' 
  (rr) 
  

  

  4 
  Grammy 
  sia 
  undata 
  Hall 
  (?) 
  (rr) 
  

  

  Broken 
  specimen. 
  

  

  5 
  Liorhynchus 
  globuliformis 
  (Van.) 
  Hall 
  (rr) 
  

  

  6 
  Lamellibranch 
  ? 
  (rr) 
  

  

  Too 
  badly 
  broken 
  to 
  be 
  identified. 
  

  

  These 
  rocks 
  are 
  clearly 
  above 
  the 
  Oneonta 
  formation 
  and 
  in 
  the 
  

   zone 
  which 
  is 
  referred 
  in 
  this 
  report 
  to 
  the 
  lower 
  part 
  of 
  the 
  

   Chemung. 
  Darton 
  in 
  describing 
  the 
  Oneonta-Chemung 
  bound- 
  

   ary 
  from 
  Franklin, 
  Delaware 
  county 
  westward, 
  said: 
  "It 
  ex- 
  

   tends 
  along 
  the 
  slopes 
  south 
  of 
  Unadilla 
  and 
  Sidney 
  down 
  the 
  

   Susquehanna 
  to 
  a 
  couple 
  of 
  miles 
  below 
  Afton." 
  a 
  On 
  the 
  Geologic 
  

   map 
  of 
  New 
  York 
  the 
  top 
  of 
  the 
  Oneonta 
  formation 
  is 
  represented 
  

   as 
  extending 
  down 
  the 
  Susquehanna 
  river 
  valley 
  rather 
  more 
  

   than 
  two 
  miles 
  below 
  Bainbridge 
  to 
  the 
  mouth 
  of 
  Bennett's 
  creek 
  

   and 
  up 
  this 
  creek 
  to 
  the 
  vicinity 
  of 
  Bennettsville. 
  If 
  this 
  line 
  

   be 
  correct 
  then 
  the 
  rocks. 
  of 
  LXVIII 
  C 
  1 
  in 
  the 
  creek 
  below 
  Ben- 
  

   nettsville 
  must 
  be 
  quite 
  near 
  the 
  bottom 
  of 
  the 
  Chemung. 
  

  

  LXIX 
  B 
  2 
  . 
  To 
  the 
  north 
  of 
  the 
  village 
  of 
  Afton 
  is 
  a 
  rocky 
  gorge 
  

   in 
  Bump's 
  creek, 
  the 
  lower 
  end 
  of 
  which 
  is 
  scarcely 
  one 
  fourth 
  

   mile 
  from 
  the 
  center 
  of 
  the 
  village. 
  The 
  base 
  of 
  the 
  rocks 
  at 
  the 
  

   lower 
  end 
  of 
  the 
  gorge 
  is 
  50 
  feet 
  above 
  the 
  Susquehanna 
  river, 
  

   and 
  some 
  85 
  feet 
  are 
  shown 
  along 
  the 
  gorge, 
  the 
  upper 
  10 
  feet 
  

   being 
  by 
  the 
  roadside 
  above 
  Pixley's 
  mill. 
  The 
  rocks 
  consist 
  

   mainly 
  of 
  olive 
  shales 
  alternating 
  with 
  sandstones 
  six 
  inches 
  to 
  

   one 
  foot 
  in 
  thickness. 
  There 
  are 
  some 
  quite 
  calcareous 
  layers 
  

   composed 
  largely 
  of 
  shells; 
  one 
  of 
  these 
  occurs 
  in 
  the 
  gorge 
  just 
  

   below 
  the 
  Pixley 
  mill 
  in 
  which 
  are 
  large 
  numbers 
  of 
  specimens 
  

  

  «Ain. 
  jour, 
  science, 
  3d 
  ser., 
  45:207. 
  

  

  