﻿Report 
  of 
  the 
  State 
  Geologist. 
  623 
  

  

  against 
  the 
  fault 
  which 
  extends 
  from 
  Patten's 
  mills 
  to 
  and 
  along 
  

   the 
  east 
  side 
  of 
  Lake 
  George. 
  It 
  is 
  a 
  thin-bedded, 
  very 
  f 
  ossifer- 
  

   ous 
  limestone, 
  with 
  calcareous 
  shale 
  intercalations. 
  The 
  small 
  

   Trenton 
  area 
  discovered 
  at 
  Wells* 
  is 
  on 
  the 
  west 
  side 
  of 
  the 
  

   Sacandaga 
  and 
  is 
  extensively 
  exposed 
  north 
  of 
  the 
  road 
  to 
  Sage- 
  

   ville. 
  It 
  is 
  a 
  light-gray, 
  moderately 
  coarse-grained, 
  highly 
  

   fossiliferous 
  limestone. 
  

  

  Utica 
  slate. 
  — 
  I 
  have 
  made 
  no 
  special 
  study 
  of 
  the 
  Utica 
  slate 
  

   excepting 
  at 
  the 
  immediate 
  vicinity 
  of 
  the 
  adjoining 
  formations 
  

   and 
  the 
  faults. 
  Its 
  characters 
  are 
  quite 
  unmistakable 
  through- 
  

   out 
  the 
  Mohawk 
  valley. 
  They 
  are 
  very 
  dark, 
  evenly-bedded 
  

   slates 
  and 
  shales, 
  with 
  alternating 
  slabby 
  beds 
  at 
  most 
  localities. 
  

   In 
  the 
  upper 
  Mohawk 
  region 
  the 
  lower 
  slabby 
  beds 
  are 
  especially 
  

   hard 
  and 
  frequent. 
  

  

  One 
  of 
  the 
  finest 
  exposures 
  in 
  the 
  Mohawk 
  valley 
  is 
  in 
  the 
  

   deep 
  ravine 
  behind 
  Canajoharie, 
  a 
  portion 
  of 
  which 
  is 
  shown 
  in 
  

   plate 
  5. 
  

  

  The 
  outlying 
  area 
  of 
  Utica 
  slate 
  at 
  Wells 
  is 
  in 
  the 
  valley 
  just 
  

   west 
  of 
  the 
  Sacandaga. 
  It 
  is 
  a 
  black 
  shale 
  of 
  the 
  typical 
  variety, 
  

   containing 
  a 
  fairly 
  abundant 
  Utica 
  fauna. 
  

  

  Kespectfully 
  yours. 
  

  

  K 
  H. 
  DAETOK 
  

  

  * 
  This 
  outlier 
  of 
  Trenton 
  limestone 
  at 
  Wells 
  was 
  described 
  hy 
  Vanuxem 
  and 
  shown 
  on 
  the 
  

   geological 
  map 
  of 
  the 
  State 
  published 
  in 
  1842. 
  In 
  a 
  later 
  edition 
  of 
  the 
  map, 
  1844, 
  accompany- 
  

   ing 
  the 
  agricultural 
  report, 
  the 
  Trenton 
  limestone 
  and 
  associated 
  rocks 
  at 
  Wells 
  were 
  shown 
  as 
  

   continuous 
  from 
  the 
  Mohawk 
  valley. 
  In 
  consequence 
  of 
  this 
  representation 
  the 
  outlier 
  referred 
  

   to 
  has 
  been 
  considered 
  as 
  a 
  recent 
  discovery. 
  — 
  H. 
  

  

  