﻿r4:6 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  currents, 
  and 
  very 
  little 
  affected 
  by 
  tides 
  or 
  other 
  disturbances, 
  inas- 
  

   much 
  as 
  crustacean 
  tracks 
  and 
  mud 
  cracks 
  were 
  not 
  obliterated. 
  

   The 
  surface 
  constantly 
  shifted, 
  however, 
  and 
  the 
  yielding 
  mud 
  of 
  

   one 
  deposition 
  partially 
  hardened 
  in 
  the 
  sun 
  before 
  it 
  received 
  the 
  

   next 
  layer 
  of 
  accumulation. 
  The 
  abundance 
  of 
  Buthotrejphis 
  and 
  

   other 
  seaweeds, 
  indicates 
  nearness 
  to 
  shore. 
  The 
  fossils 
  of 
  several 
  

   strata 
  occur 
  principally 
  on 
  surfaces 
  or 
  partings 
  of 
  the 
  shaly 
  layers, 
  

   indicating 
  landlocked 
  bays 
  occasionally 
  invaded 
  by 
  high 
  tides. 
  

   Local 
  deposition 
  of 
  sand 
  and 
  gravel 
  took 
  place 
  at 
  intervals. 
  Some 
  

   of 
  the 
  pebbles 
  have 
  the 
  appearance 
  of 
  materials 
  of 
  volcanic 
  origin 
  

   (137 
  D6). 
  At 
  about 
  the 
  period 
  when 
  the 
  latter 
  appear, 
  clear 
  water 
  

   conditions 
  seem 
  to 
  have 
  existed 
  long 
  enough 
  to 
  permit 
  the 
  growth 
  

   of 
  small 
  corals 
  (E 
  2-4), 
  which 
  may 
  have 
  been 
  suddenly 
  destroyed 
  

   by 
  a 
  volcanic 
  eruption. 
  The 
  character 
  of 
  the 
  fauna 
  is 
  shown 
  to 
  be 
  

   quite 
  constant, 
  so 
  that 
  it 
  is 
  not 
  easy 
  to 
  define 
  good 
  faunal 
  zones, 
  

   although 
  the 
  materials 
  deposited 
  vary 
  considerably. 
  Foerste 
  

   ('85 
  p. 
  656} 
  says 
  that 
  in 
  Ohio 
  the 
  Clinton 
  deposits 
  were 
  made 
  in 
  

   valleys 
  and 
  gullies 
  washed 
  out 
  of 
  the 
  Cincinnati 
  group 
  strata. 
  The 
  

   wastings 
  of 
  an 
  otherwise 
  shallow 
  sea 
  \vere 
  then 
  very 
  irregularly 
  

   deposited 
  near 
  the 
  shore 
  line, 
  giving 
  fine 
  silts 
  at 
  a 
  distance 
  from 
  

   land, 
  with 
  comparatively 
  even 
  depositioii, 
  while 
  near 
  the 
  shore 
  the 
  

   deposits 
  of 
  all 
  sorts 
  would 
  accumulate 
  in 
  the 
  pre-Clinton 
  depressions 
  

   of 
  the 
  sea 
  bottom. 
  

  

  As 
  a 
  rule 
  the 
  strata 
  studied 
  in 
  this 
  paper 
  are 
  not 
  calcareous. 
  

   Toward 
  Eochester, 
  deeper 
  water 
  conditions 
  prevailed 
  with 
  deposition 
  

   of 
  the 
  limestones 
  containing 
  Pentameriis 
  (Fairchild 
  '94) 
  which 
  is 
  

   lacking 
  in 
  the 
  district 
  studied. 
  

  

  As 
  stated 
  by 
  Smyth 
  ('92) 
  the 
  southwest 
  dip 
  of 
  the 
  strata 
  is 
  so 
  

   slight 
  as 
  to 
  be 
  hardly 
  noticeable 
  at 
  the 
  exposures. 
  

  

  With 
  the 
  possible 
  exception 
  of 
  the 
  outcrop 
  at 
  137 
  D 
  15 
  which, 
  

   judging 
  solely 
  from 
  its 
  position 
  and 
  color, 
  may 
  be 
  the 
  Onondaga, 
  

   no 
  strata 
  above 
  the 
  Clinton 
  were 
  found 
  in 
  the 
  area. 
  

  

  L.1ST 
  OF 
  PAPERS 
  REFERRED 
  TO 
  IN 
  THE 
  TEXT 
  

  

  Brain 
  erd, 
  E. 
  and 
  Seely, 
  H. 
  M. 
  

  

  '88. 
  The 
  original 
  Chazy 
  rocks. 
  

  

  Amer. 
  geol. 
  2 
  : 
  323-30, 
  with 
  map. 
  

   Author's 
  reprint 
  p. 
  1-7. 
  

  

  