﻿i 
  

  

  680 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  summit 
  of 
  the 
  Point, 
  the 
  Chazy 
  limestone 
  appears 
  coming 
  close 
  

   to 
  the 
  lake, 
  with 
  a 
  dip 
  which 
  would 
  carry 
  it 
  against 
  the 
  

   Trenton, 
  if 
  prolonged 
  to 
  the 
  lake, 
  though 
  the 
  dip 
  of 
  both 
  is 
  the 
  

   same, 
  five 
  degrees 
  south, 
  forty 
  degrees 
  east. 
  On 
  Crab 
  Island, 
  

   one 
  and 
  one-half 
  miles 
  northeast 
  of 
  Bluff 
  Point, 
  the 
  Trenton 
  is 
  

   beautifully 
  shown 
  in 
  part, 
  dipping 
  ten 
  degrees 
  to 
  the 
  north, 
  

   somewhat 
  more 
  massive 
  than 
  on 
  the 
  mainland, 
  but 
  still 
  jjuite 
  

   slaty, 
  apparently 
  higher 
  up 
  in 
  the 
  group, 
  and 
  affording 
  beautifully 
  

   preserved 
  fossils 
  in 
  abundance, 
  many 
  forms 
  occurring 
  here 
  which 
  

   were 
  not 
  seen 
  in 
  the 
  slaty 
  beds 
  on 
  the 
  shore, 
  among 
  others 
  

   Bellerophon 
  bilobatus, 
  a 
  Nucula, 
  two 
  species 
  of 
  Tellinomya, 
  and 
  

   two 
  species 
  of 
  Lingula. 
  In 
  northeast 
  Peru 
  black 
  slaty 
  limestone 
  

   with 
  occasional 
  fossils 
  is 
  exposed 
  on 
  the 
  lake 
  shore, 
  but 
  is 
  soon 
  cut 
  

   out 
  by 
  the 
  appearance 
  of 
  the 
  Chazy 
  on 
  the 
  shore 
  to 
  the 
  south, 
  

   and 
  is 
  the 
  most 
  southerly 
  exposure 
  of 
  Trenton 
  limestone 
  in 
  the 
  

   county. 
  

  

  Hudson 
  River 
  group. 
  — 
  But 
  one 
  exposure 
  of 
  rock 
  later 
  than 
  

   the 
  Trenton 
  limestone 
  in 
  age 
  occurs 
  in 
  the 
  county. 
  At 
  Stony 
  

   Point, 
  one 
  mile 
  south 
  of 
  Rouse's 
  Point, 
  running 
  thence 
  ior 
  about 
  

   half 
  a 
  mile 
  along 
  the 
  shore 
  south 
  of 
  the 
  breakwater, 
  is 
  an 
  out- 
  

   crop 
  of 
  black 
  calcareous 
  slate, 
  or 
  slaty 
  limestone, 
  cut 
  up 
  into 
  

   small 
  blocks 
  by 
  vertical 
  joints 
  which 
  are 
  filled 
  with 
  calcite 
  and 
  

   resembling 
  much 
  of 
  the 
  Trenton, 
  though 
  more 
  slaty. 
  In 
  all 
  

   about 
  twenty 
  feet 
  are 
  exposed, 
  and 
  throughout 
  fossils 
  are 
  quite 
  

   abundant. 
  The 
  fauna 
  is 
  that 
  of 
  the 
  Utica 
  slate, 
  Triarthrus 
  

   Beckii 
  and 
  Graptolithus 
  prisHs 
  being 
  the 
  only 
  common 
  forms, 
  

   associated 
  with 
  them 
  being 
  occasional 
  specimens 
  of 
  Endoceras 
  

   proteiforme, 
  and 
  rarely 
  some 
  species 
  of 
  graptolites. 
  The 
  

   dip 
  is 
  ten 
  degrees 
  to 
  the 
  northwest. 
  

  

  Structural 
  characteristics. 
  — 
  The 
  prevailing 
  dips 
  of 
  the 
  region 
  

   are 
  gentle, 
  commonly 
  ranging 
  from 
  B.ve 
  to 
  ten 
  degrees. 
  

   Locally 
  they 
  sometimes 
  become 
  quite 
  steep. 
  They 
  range 
  

   ordinarily 
  in 
  direction 
  from 
  north 
  to 
  northeast, 
  east 
  and 
  

   somewhat 
  south 
  of 
  east, 
  the 
  former 
  being 
  more 
  common 
  

   north 
  of 
  the 
  Adirondacks, 
  and 
  the 
  latter 
  east 
  of 
  them, 
  or 
  in 
  

   other 
  words, 
  the 
  dip 
  is 
  in 
  general 
  away 
  from 
  the 
  mountains. 
  

   Dips 
  to 
  the 
  west 
  are 
  exceptional 
  and 
  local 
  and 
  can 
  gener- 
  

   ally 
  oe 
  snown 
  to 
  be 
  accompanied 
  by 
  a 
  fault. 
  Folds 
  are 
  practically 
  

   absent, 
  though 
  a 
  slight 
  amount 
  of 
  local 
  folding 
  has 
  occurred 
  nere 
  

  

  