﻿Report 
  of 
  the 
  State 
  Geologist. 
  233 
  

  

  back 
  over 
  it 
  to 
  a 
  considerable 
  depth, 
  and 
  the 
  rock 
  is 
  now 
  so 
  cov- 
  

   ered 
  by 
  mud 
  that 
  it 
  cannot 
  be 
  seen 
  except 
  on 
  the 
  rare 
  occasions 
  

   when 
  the 
  water 
  is 
  drawn 
  off. 
  

  

  About 
  twenty 
  years 
  ago 
  several 
  large 
  blocks 
  were 
  quarried 
  out 
  

   and 
  hauled 
  on 
  to 
  the 
  west 
  bank 
  of 
  the 
  creek, 
  immediately 
  south 
  of 
  

   the 
  railroad 
  bridge, 
  where 
  they 
  were 
  left 
  and 
  may 
  now 
  be 
  seen. 
  

   The 
  more 
  exposed 
  parts 
  crumbled 
  into 
  little 
  angular 
  blocks, 
  

   as 
  is 
  frequently 
  the 
  case 
  with 
  the 
  Tully 
  limestone 
  under 
  such 
  

   circumstances. 
  

  

  It 
  does 
  not 
  appear 
  in 
  the 
  banks 
  of 
  the 
  stream, 
  m 
  r 
  do 
  either 
  the 
  

   Hamilton 
  shales 
  below 
  or 
  the 
  Genesee 
  shales 
  above. 
  The 
  nearest 
  

   rock 
  exposure 
  is 
  in 
  a 
  small 
  ravine 
  about 
  one-fourth 
  of 
  a 
  mile 
  south- 
  

   east 
  from 
  the 
  village, 
  which 
  shows 
  forty 
  to 
  fifty 
  feet 
  of 
  black 
  

   Genesee 
  shales. 
  The 
  lowest 
  bedrock 
  seen 
  is 
  perhaps 
  twenty 
  -five 
  

   feet 
  above 
  the 
  Tully 
  limestone. 
  

  

  Without 
  doubt 
  the 
  most 
  western 
  outcrop 
  of 
  this 
  limestone 
  

   is 
  the 
  one 
  about 
  five 
  and 
  one-half 
  miles 
  west, 
  and 
  but 
  a 
  few 
  

   rods 
  north 
  of 
  that 
  at 
  Gorham, 
  and 
  two 
  and 
  three-quarters 
  

   miles 
  north 
  of 
  the 
  boundary 
  line 
  between 
  Ontario 
  and 
  Yates 
  

   counties, 
  at 
  the 
  crossing 
  of 
  the 
  road 
  leading 
  from 
  Canandaigua 
  to 
  

   Eushville, 
  known 
  as 
  the 
  " 
  lake 
  shore 
  road," 
  near 
  a 
  small 
  stream 
  

   which 
  empties 
  into 
  Canandaigua 
  lake 
  at 
  Gage's 
  Landing. 
  It 
  is 
  

   distant 
  not 
  more 
  than 
  a 
  mile 
  from 
  the 
  lake, 
  but 
  the 
  nearest 
  

   exposure 
  of 
  that 
  horizon 
  (that 
  is, 
  of 
  the 
  over-, 
  and 
  underlying 
  

   shales) 
  on 
  the 
  lake 
  shore 
  is 
  fully 
  three 
  miles 
  away, 
  in 
  a 
  south- 
  

   westerly 
  direction. 
  

  

  At 
  this 
  place 
  ten 
  to 
  twelve 
  feet 
  of 
  Genesee 
  shales 
  are 
  exposed 
  

   immediately 
  above 
  the 
  limestone, 
  and 
  below 
  it 
  the 
  Hamilton 
  

   shales 
  have 
  been 
  worn 
  away, 
  m 
  iking 
  a 
  fall 
  about 
  twelve 
  feet 
  

   high, 
  and 
  forming 
  a 
  small 
  amphitheater 
  into 
  which 
  many 
  large 
  

   blocks 
  of 
  the 
  limestone 
  have 
  fallen. 
  

  

  The 
  ravine 
  begun 
  here 
  continues 
  nearly 
  to 
  the 
  lake, 
  presenting 
  

   many 
  fine 
  exposures 
  of 
  the 
  upper 
  Hamilton 
  beds. 
  The 
  lime- 
  

   stone 
  at 
  this 
  place 
  measures 
  thirty 
  one 
  inches 
  in 
  thickness, 
  and 
  is 
  

   divided 
  by 
  a 
  thin, 
  shaly 
  seam 
  into 
  two 
  layers, 
  the 
  lower 
  twenty- 
  

   eight 
  and 
  the 
  upper 
  three 
  inches 
  thick. 
  There 
  is 
  no 
  noticeable 
  

   difference 
  in 
  character 
  in 
  the 
  two 
  layers. 
  

  

  In 
  the 
  shaly 
  seam 
  and 
  lower 
  part 
  of 
  the 
  thick 
  layer, 
  where 
  

   it 
  is 
  somewhat 
  shaly, 
  fossils 
  are 
  quite 
  common, 
  Rhynchonella 
  

   30 
  

  

  