﻿322 
  H. 
  L. 
  Smyth 
  — 
  Geology 
  of 
  Steep 
  Rock 
  Lake, 
  Ont. 
  

  

  IX. 
  Dark 
  Gray 
  clay 
  slate. 
  

  

  VIII. 
  Agglomerate. 
  

  

  VII. 
  Greenstones 
  and 
  greenstone 
  schists. 
  

  

  VI. 
  Upper 
  conglomerate. 
  

  

  V. 
  Upper 
  calcareous 
  green 
  schist. 
  

  

  IV. 
  Interbedded 
  crystalline 
  traps. 
  

  

  III. 
  Ferruginous 
  formation. 
  

  

  IT. 
  Lower 
  limestone. 
  

  

  I. 
  Conglomerate. 
  

  

  In 
  the 
  foregoing 
  description 
  of 
  the 
  basement 
  complex 
  the 
  

   northern 
  limit 
  of 
  the 
  Steep 
  Rock 
  series 
  has 
  roughly 
  been 
  indi- 
  

   cated. 
  Formations 
  I 
  and 
  II 
  occur 
  in 
  isolated 
  patches 
  north 
  of 
  

   the 
  water 
  on 
  shores 
  that 
  are 
  otherwise 
  occupied 
  only 
  by 
  the 
  

   granites. 
  Along 
  the 
  whole 
  course 
  of 
  the 
  lake 
  they 
  dip, 
  at 
  

   very 
  steep 
  angles, 
  ranging 
  from 
  60° 
  to 
  80° 
  away 
  from 
  the 
  

   basement 
  rocks, 
  upon 
  which 
  they 
  hang 
  as 
  a 
  time-worn 
  fringe, 
  

   having 
  no 
  extension 
  inland. 
  The 
  shore 
  line 
  lies 
  sometimes 
  in 
  

   the 
  granites 
  and 
  sometimes 
  in 
  the 
  Steep 
  Rock 
  series, 
  but 
  in 
  a 
  

   general 
  way 
  follows 
  closely 
  in 
  direction 
  the 
  boundary 
  between 
  

   them. 
  It 
  is 
  only 
  along 
  these 
  northern 
  shores 
  that 
  formations 
  

   I 
  and 
  II 
  are 
  seen 
  at 
  all, 
  and 
  as 
  they 
  are 
  usually 
  found 
  together, 
  

   separated 
  from 
  the 
  higher 
  members 
  by 
  intervening 
  water, 
  it 
  

   will 
  be 
  convenient 
  to 
  keep 
  them 
  apart 
  from 
  the 
  rest 
  for 
  pur- 
  

   poses 
  of 
  description. 
  The 
  basal 
  member 
  of 
  the 
  Steep 
  Rock 
  

   series, 
  which 
  is 
  generally 
  found 
  between 
  the 
  granites 
  and 
  the 
  

   lower 
  limestone, 
  is 
  a 
  bed 
  having 
  a 
  maximum 
  thickness 
  of 
  

   nearly 
  100 
  feet, 
  presenting 
  the 
  various 
  phases 
  of 
  a 
  conglomer- 
  

   ate, 
  coarse 
  and 
  fine, 
  a 
  quartzite 
  and 
  a 
  quartz 
  schist 
  with 
  feldspar. 
  

   The 
  formation 
  occurs 
  as 
  a 
  coarse 
  conglomerate 
  at 
  the 
  eastern 
  

   end 
  of 
  Conglomerate 
  Bay. 
  The 
  lowest 
  member 
  exposed 
  at 
  the 
  

   water 
  consists 
  of 
  rounded 
  and 
  water- 
  worn 
  pebbles 
  of 
  quartz 
  

   and 
  greenstone, 
  of 
  considerable 
  size, 
  the 
  largest 
  seen 
  being 
  a 
  

   foot 
  in 
  diameter, 
  imbedded 
  in 
  a 
  green 
  schistose 
  matrix. 
  The 
  

   strike 
  of 
  the 
  rock 
  is 
  about 
  N. 
  and 
  S., 
  as 
  indicated 
  both 
  by 
  the 
  

   alignment 
  of 
  the 
  pebbles, 
  and 
  the 
  lines 
  of 
  junction 
  of 
  layers 
  

   carrying 
  no 
  pebbles 
  No 
  granitic 
  pebbles 
  were 
  found 
  at 
  this 
  

   locality. 
  In 
  the 
  higher 
  portion 
  of 
  the 
  bed 
  pebbles 
  ' 
  become 
  

   smaller 
  and 
  relatively 
  fewer, 
  and 
  the 
  rock 
  passes 
  into 
  a 
  green 
  

   schist, 
  with 
  small 
  clastic 
  grains 
  of 
  quartz. 
  

  

  On 
  the 
  northern 
  end 
  of 
  the 
  island 
  in 
  Northwest 
  Bay 
  forma- 
  

   tion 
  (I) 
  is 
  represented 
  by 
  a 
  fine 
  conglomerate 
  consisting 
  of 
  

   closely-packed 
  small 
  quartz 
  grains 
  (128) 
  with 
  little 
  cementing 
  

   material, 
  holding 
  occasional 
  pebbles 
  up 
  to 
  3 
  or 
  4 
  inches 
  in 
  

   diameter, 
  of 
  rounded 
  and 
  water-worn 
  quartz, 
  bluish, 
  milky- 
  

   white 
  and 
  dark. 
  A 
  layer 
  of 
  limestone 
  of 
  uncertain 
  thickness 
  

   is 
  also 
  interbedded 
  The 
  lowest 
  formation 
  does 
  not 
  usually 
  

   occur 
  as 
  a 
  coarse 
  conglomerate 
  in 
  East 
  Bay. 
  It 
  there 
  consists, 
  

  

  