﻿GEOLOGY 
  OF 
  THE 
  NORTH 
  CREEK 
  QUADRANGLE 
  7 
  

  

  Quite 
  typical 
  Adirondack 
  lakes 
  and 
  ponds 
  are 
  fairly 
  abundant, 
  

   about 
  thirty 
  of 
  them 
  being 
  represented 
  on 
  the 
  map. 
  The 
  largest 
  

   is 
  Schroon 
  lake, 
  only 
  the 
  southern 
  end 
  of 
  which 
  lies 
  within 
  the 
  

   map 
  limits. 
  The 
  others 
  range 
  in 
  size 
  from 
  small 
  ponds 
  to 
  lakes 
  

   two 
  or 
  three 
  miles 
  long 
  such 
  as 
  Friends 
  and 
  Loon 
  lakes. 
  

  

  From 
  the 
  geologic 
  standpoint, 
  the 
  North 
  Creek 
  quadrangle 
  is 
  of 
  

   more 
  than 
  the 
  usual 
  interest 
  because 
  of 
  both 
  the 
  rock 
  types 
  and 
  

   structures. 
  With 
  the 
  single 
  exception 
  of 
  the 
  anorthosite, 
  all 
  the 
  

   important 
  rock 
  formations 
  of 
  the 
  eastern 
  Adirondacks 
  are 
  abun- 
  

   dantly 
  represented. 
  Except 
  for 
  the 
  superficial 
  glacial 
  and 
  recent 
  

   deposits, 
  the 
  rocks 
  of 
  the 
  quadrangle 
  are 
  all 
  of 
  Precambric 
  age, 
  

   and 
  nearly 
  all 
  are 
  highly 
  metamorphosed, 
  foliated, 
  and 
  folded. 
  

  

  Following 
  is 
  a 
  list 
  of 
  all 
  the 
  rock 
  formations, 
  except 
  the 
  Pleisto- 
  

   cene, 
  given 
  in 
  the 
  regular 
  geological 
  order 
  of 
  relative 
  ages 
  : 
  

  

  5 
  Diabase 
  : 
  wholly 
  nonmetamorphosed, 
  occurring 
  in 
  comparatively 
  

  

  small, 
  narrow 
  dikes, 
  and 
  clearly 
  cutting 
  all 
  the 
  other 
  rocks 
  of 
  

  

  the 
  region. 
  

   4 
  Pegmatite 
  : 
  wholly 
  nonmetamorphosed, 
  dikelike 
  masses 
  cutting 
  

  

  all 
  rocks 
  except 
  the 
  diabase. 
  

   3 
  Gabbro: 
  more 
  or 
  less 
  metamorphosed, 
  occurring 
  in 
  stocks 
  or 
  

  

  dikes 
  and 
  cutting 
  all 
  types 
  of 
  the 
  syenite-granite 
  and 
  Gren- 
  

  

  ville 
  series. 
  

   2 
  Syenite-granite 
  group 
  : 
  distinctly 
  gneissoid 
  rocks, 
  representing 
  

  

  several 
  facies 
  of 
  a 
  single 
  great 
  intrusive 
  mass, 
  and 
  clearly 
  

  

  younger 
  than 
  the 
  Grenville. 
  

   1 
  Grenville 
  series 
  : 
  highly 
  metamorphosed 
  and 
  foliated 
  sedimentary 
  

  

  rocks, 
  including 
  crystalline 
  limestone, 
  quartzite, 
  and 
  various 
  

  

  dark 
  to 
  light 
  colored 
  gneisses. 
  These 
  are 
  the 
  oldest 
  rocks 
  

  

  of 
  the 
  region. 
  

  

  In 
  spite 
  of 
  the 
  rugged 
  character 
  of 
  the 
  topography, 
  the 
  accessi- 
  

   bility 
  of 
  all 
  parts 
  of 
  the 
  quadrangle 
  and 
  the 
  general 
  excellence 
  of 
  

   rock 
  exposures 
  have 
  afforded 
  an 
  unusual 
  opportunity 
  for 
  detailed 
  

   field 
  work. 
  Many 
  important 
  geologic 
  relationships 
  are 
  very 
  clearly 
  

   exhibited. 
  

  

  Following 
  are 
  the 
  principal 
  papers 
  which 
  have 
  a 
  more 
  or 
  less 
  

   direct 
  bearing 
  upon 
  the 
  geology 
  of 
  the 
  quadrangle 
  : 
  

  

  1842 
  Emmons. 
  Geology 
  of 
  the 
  Second 
  District, 
  N. 
  Y. 
  

  

  1897 
  Kemp 
  & 
  Newland. 
  Preliminary 
  Report 
  on 
  the 
  Geology 
  of 
  Washington, 
  

  

  Warren 
  and 
  Parts 
  of 
  Essex 
  and 
  Hamilton 
  Counties. 
  In 
  17th 
  Annual 
  

  

  Rep't 
  N. 
  Y. 
  State 
  Geologist. 
  

  

  