﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  491 
  

  

  In 
  the 
  final 
  report 
  of 
  the 
  first 
  district 
  (1843) 
  Lieut. 
  Mather 
  (4) 
  

   changed 
  the 
  name 
  Hudson 
  river 
  slate 
  group 
  to 
  Hudson 
  river 
  

   group. 
  Of 
  its 
  fossil 
  contents 
  he 
  reports 
  (p. 
  369) 
  : 
  " 
  These 
  rocks 
  

   contain 
  few 
  fossils 
  except 
  fucoids, 
  and 
  these 
  are 
  extremely 
  abun- 
  

   dant 
  in 
  some 
  of 
  the 
  strata. 
  A 
  few 
  specimens 
  of 
  testacea 
  only 
  have 
  

   been 
  found 
  in 
  this 
  group, 
  although 
  it 
  is 
  well 
  exposed 
  to 
  view 
  

   over 
  a 
  great 
  extent 
  of 
  country 
  in 
  the 
  first 
  geological 
  district." 
  

   The 
  strata 
  of 
  the 
  Hudson 
  river 
  group 
  in 
  the 
  northern 
  counties 
  

   (including 
  Albany 
  county) 
  are 
  described 
  under 
  two 
  heads 
  (p. 
  375) 
  : 
  

  

  1 
  Those 
  east 
  of 
  the 
  anticlinal 
  axis, 
  which 
  are 
  upturned. 
  

  

  2 
  Those 
  west 
  of 
  the 
  anticlinal 
  axis 
  which 
  are 
  but 
  little 
  dis- 
  

   turbed. 
  

  

  The 
  anticlinal 
  axis 
  above 
  referred 
  to 
  ranges 
  from 
  near 
  New 
  

   Baltimore 
  by 
  Saratoga 
  lake 
  to 
  Bakers 
  falls. 
  

  

  Of 
  the 
  upturned 
  strata 
  it 
  is 
  said 
  that 
  they 
  all 
  dip 
  

   eastsoutheast, 
  and 
  in 
  regard 
  to 
  the 
  less 
  disturbed 
  beds 
  

   Dr 
  Mather 
  remarks 
  (p. 
  377); 
  " 
  The 
  horizontal 
  and 
  slightly 
  

   mclined 
  strata 
  of 
  slates 
  and 
  grits 
  of 
  the 
  Hudson 
  river 
  

   group, 
  lying 
  on 
  the 
  west 
  of 
  the 
  anticlinal 
  axis, 
  as 
  traced 
  from 
  New 
  

   Jersey 
  to 
  Saratoga 
  lake, 
  were 
  formerly 
  considered 
  as 
  more 
  recent 
  

   strata 
  than 
  the 
  upturned 
  rocks 
  of 
  the 
  Hudson 
  valley, 
  and 
  as 
  resting 
  

   uneonformably 
  on 
  them. 
  It 
  was 
  not 
  until 
  the 
  labors 
  of 
  the 
  geo- 
  

   logic 
  survey 
  were 
  more 
  than 
  half 
  completed, 
  that 
  sufficient 
  evi- 
  

   dence 
  was 
  obtained 
  to 
  establish 
  the 
  fact 
  with 
  certainty 
  that 
  they 
  

   are 
  of 
  the 
  same 
  geologic 
  age." 
  It 
  is 
  farther 
  stated 
  that 
  the 
  strata 
  

   could 
  be 
  traced 
  across 
  the 
  line 
  of 
  disturbance 
  only 
  in 
  the 
  Mohawk 
  

   valley, 
  that 
  however, 
  the 
  Trenton 
  and 
  the 
  TItica 
  formations 
  were 
  

   recognized 
  in 
  the 
  tilted 
  strata 
  by 
  their 
  fossils, 
  the 
  Utica 
  shall 
  

   the 
  graptolites. 
  

  

  It 
  follows 
  from 
  these 
  quotations 
  that 
  Dr 
  Mather 
  distinctly 
  cor- 
  

   related 
  the 
  Hudson 
  river 
  beds 
  with 
  the 
  Lorraine 
  beds, 
  or 
  rather 
  

   with 
  the 
  Frankfort 
  slates 
  of 
  the 
  Mohawk 
  valley, 
  that 
  he 
  farther 
  

   believed 
  that 
  the 
  Trenton 
  and 
  Utica 
  beds 
  could 
  be 
  recognized 
  

   in 
  the 
  Hudson 
  valley. 
  As 
  to 
  the 
  latter, 
  it 
  is 
  evident 
  from 
  his 
  

   description 
  of 
  the 
  Utica 
  slate 
  that 
  he 
  did 
  not 
  yet 
  discern 
  between 
  

   the 
  Normans 
  kill 
  graptolites 
  and 
  the 
  Utica 
  shale 
  graptolites 
  and 
  

   considered 
  all 
  graptolite-bearing 
  shales 
  as 
  being 
  of 
  Utica 
  age; 
  

  

  