﻿450 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  the 
  broken-line 
  portion 
  of 
  the 
  sections 
  are 
  exposed 
  in 
  the 
  bed 
  

   and 
  banks 
  of 
  the 
  creek. 
  

  

  Fig. 
  7.— 
  Cross-section 
  of 
  overthrust 
  west 
  of 
  South 
  Bethlehem, 
  Albany 
  county. 
  Exposure 
  on 
  

   south 
  bank 
  of 
  Spray 
  t 
  creek. 
  Looking 
  north. 
  (Reversed.) 
  

  

  I 
  discovered 
  these 
  overthrusts 
  in 
  the 
  antnmn 
  of 
  1892 
  and 
  sent 
  

   a 
  brief 
  account 
  of 
  their 
  relations 
  to 
  the 
  Geological 
  Society 
  of 
  

   America.* 
  In 
  1893 
  I 
  again 
  visited 
  the 
  locality 
  and 
  on 
  careful 
  

   re-examination, 
  under 
  much 
  more 
  favorable 
  conditions, 
  found 
  

   that 
  the 
  features 
  were 
  somewhat 
  more 
  complicated 
  than 
  I 
  had 
  

   first 
  supposed. 
  

  

  It 
  is 
  unfortunate 
  that 
  the 
  exposures 
  are 
  not 
  more 
  complete, 
  but 
  

   sufficient 
  is 
  seen, 
  I 
  believe, 
  to 
  substantiate 
  the 
  interpretation 
  given 
  

   in 
  the 
  figure. 
  Only 
  the 
  upper 
  portion 
  of 
  the 
  " 
  underturned 
  " 
  fold 
  

   is 
  exposed 
  in 
  the 
  limestone, 
  but 
  the 
  greater 
  part 
  of 
  the 
  fault 
  plane 
  is 
  

   visible 
  on 
  the 
  south 
  bank 
  of 
  the 
  creek 
  above 
  the 
  dam. 
  The 
  

   enfolded 
  slate 
  is 
  seen 
  to 
  be 
  excessively 
  crumpled 
  and 
  its 
  original 
  

   bedding 
  planes 
  obliterated, 
  but 
  the 
  lower 
  limestones 
  bend 
  over 
  

   the 
  arch 
  with 
  but 
  little 
  fracture. 
  There 
  has 
  been 
  considerable 
  

   slipping 
  along 
  the 
  contact 
  of 
  the 
  slate, 
  and 
  the 
  portion 
  of 
  the 
  

   limestone 
  which 
  is 
  folded 
  under 
  is 
  considerably 
  broken 
  and 
  con- 
  

   torted. 
  At 
  several 
  points, 
  as 
  shown 
  in 
  the 
  figure, 
  fragments 
  of 
  

   the 
  limestones 
  have 
  been 
  torn 
  off 
  and 
  are 
  more 
  or 
  less 
  surrounded 
  

   by 
  the 
  slate. 
  

  

  In 
  the 
  north 
  bank 
  of 
  the 
  creek, 
  under 
  the 
  mill, 
  the 
  exposure 
  is 
  

   less 
  extensive, 
  but 
  the 
  general 
  relations 
  are 
  similar 
  to 
  those 
  on 
  

   the 
  south 
  side. 
  The 
  principal 
  features 
  in 
  this 
  exposure 
  are 
  shown 
  

   in 
  the 
  following 
  figure. 
  

  

  * 
  Published 
  In 
  the 
  Bulletin, 
  vol. 
  4, 
  pp. 
  436-439. 
  

  

  