﻿EEPORT 
  OF 
  THE 
  DIEECTOR 
  r67 
  

  

  Lave 
  free 
  drainage 
  to 
  the 
  north 
  and 
  occupy 
  distinct 
  preglacial 
  

   valleys. 
  Lakes 
  Cayuga 
  and 
  Seneca, 
  the 
  two 
  largest 
  of 
  the 
  series, 
  

   have 
  their 
  bottoms 
  considerably 
  below 
  sea 
  level. 
  The 
  rocks 
  are 
  

   almost 
  wholly 
  Devonian 
  in 
  age 
  and 
  consist 
  principally 
  of 
  inter- 
  

   bedded 
  shales, 
  sandstones 
  and 
  limestones, 
  with 
  an 
  almost 
  horizontal 
  

   attitude, 
  though 
  having 
  a 
  slight 
  but 
  perceptible 
  general 
  southerly 
  

   dij). 
  In 
  the 
  Cayuga 
  lake 
  region 
  the 
  rocks 
  have 
  suffered 
  more 
  dis- 
  

   turbance, 
  and 
  are 
  thrown 
  into 
  very 
  gentle 
  folds," 
  whose 
  axes 
  are 
  

   approximately 
  east 
  and 
  west 
  ; 
  or, 
  at 
  right 
  angles 
  to 
  that 
  of 
  the 
  

   lake. 
  

  

  Located 
  some 
  12 
  to 
  15 
  miles 
  from 
  the 
  heads 
  of 
  the 
  lakes, 
  is 
  

   an 
  irregular 
  divide, 
  which 
  has 
  been 
  best 
  described 
  by 
  Professor 
  

   Tarr^ 
  as 
  being 
  " 
  high 
  and 
  diverse 
  in 
  topography", 
  separating 
  the 
  

   Chemung-Susquehanna 
  tributaries 
  on 
  the 
  south, 
  from 
  the 
  southern 
  

   tributaries 
  of 
  the 
  St 
  Lawrence 
  system 
  on 
  the 
  north. 
  At 
  the 
  divides 
  

   of 
  the 
  lake 
  valleys 
  is 
  found 
  the 
  '' 
  Terminal 
  moraine 
  of 
  the 
  second 
  

   glacial 
  epoch 
  " 
  as 
  traced, 
  mapped 
  and 
  described 
  by 
  Professor 
  

   ■Chamberlin."^ 
  Its 
  position 
  on 
  the 
  hill-tops 
  is 
  marked 
  at 
  the 
  

   fojlowing 
  points 
  : 
  Bristol, 
  2254 
  feet 
  ; 
  Virgil, 
  2133 
  feet 
  ; 
  Urbana, 
  

   1940 
  feet; 
  Orange, 
  2033 
  feet 
  ; 
  Newheld, 
  2095 
  feet 
  ; 
  Dryden, 
  1888 
  

   ieet 
  ; 
  Solon, 
  1977 
  feet 
  ; 
  Fabius, 
  2015 
  feet 
  ; 
  Fenner, 
  1862 
  feet.^^ 
  

  

  Broadly 
  speaking, 
  the 
  plateau 
  may 
  be 
  regarded 
  as 
  extending 
  from 
  

   the 
  Catskill 
  mountains 
  on 
  the 
  east 
  to 
  Chautauqua 
  county 
  on 
  the 
  west 
  

   and 
  merging 
  into 
  the 
  '^ 
  Great 
  Lakes 
  shore 
  plain 
  " 
  * 
  on 
  the 
  north, 
  

   with 
  a 
  very 
  strongly 
  defined 
  northern 
  slope 
  throughout 
  (Figure 
  1). 
  

   The 
  highest 
  elevations 
  found 
  over 
  many 
  of 
  its 
  parts 
  reach 
  2000 
  

   feet 
  and 
  over, 
  with 
  a 
  general 
  average 
  elevation 
  of 
  approximately 
  

   1200 
  feet 
  above 
  sea 
  level. 
  Dr 
  Lincoln-^ 
  has 
  described 
  the 
  plateau 
  

   as 
  being 
  axially 
  depressed 
  along 
  the 
  Cayuga-Seneca 
  region 
  in 
  a 
  

   north 
  and 
  south 
  direction, 
  which 
  he 
  illustrates 
  by 
  a 
  diagram. 
  

  

  The 
  Finger-lakes 
  proper 
  may 
  be 
  regarded 
  as 
  extending 
  from 
  

   Otisco 
  lake 
  on 
  the 
  east 
  to 
  the 
  Genesee 
  river 
  on 
  tliewest; 
  or, 
  as 
  

  

  a 
  Williams. 
  H. 
  S., 
  Bulletin 
  no. 
  80, 
  U. 
  S. 
  G. 
  S., 
  Washington, 
  1891. 
  

  

  Ibid. 
  Proc. 
  Amer. 
  asso. 
  adv. 
  sci., 
  1882, 
  31, 
  412. 
  This 
  one 
  especially. 
  

   fcTarr, 
  R 
  S., 
  Bull. 
  geol. 
  soc. 
  Am., 
  1894, 
  V. 
  310. 
  

  

  c 
  Chamberlin, 
  T- 
  C, 
  Third 
  ann. 
  report. 
  U. 
  S. 
  G. 
  S., 
  1881-'82, 
  295-402, 
  

  

  dTriangulation 
  of 
  New 
  York 
  state 
  survey, 
  1883, 
  1887 
  ; 
  also, 
  see 
  Lincoln, 
  D. 
  F., 
  Am. 
  journ. 
  

   «ci., 
  1892, 
  44, 
  290. 
  

   eTarr, 
  R. 
  S., 
  Bull. 
  Am. 
  geogr. 
  soc, 
  1806, 
  2S, 
  106-107, 
  111. 
  

   /Lincoln, 
  D.F., 
  Am. 
  journ. 
  sci., 
  1892, 
  44, 
  290-293. 
  

  

  