﻿330 
  H. 
  L. 
  Smyth 
  — 
  Geology 
  of 
  Steep 
  Bock 
  Lake, 
  Out. 
  

  

  transition 
  zone 
  at 
  the 
  junction 
  of 
  the 
  basement 
  complex 
  and 
  

   Formation 
  I, 
  represents 
  the 
  depth 
  to 
  which 
  the 
  granites, 
  

   previously 
  weakened 
  by 
  disintegration, 
  were 
  affected 
  by 
  the 
  

   grinding. 
  In 
  this 
  zone 
  there 
  was 
  also 
  doubtless 
  a 
  certain 
  

   intermingling 
  of 
  particles 
  produced 
  by 
  the 
  action 
  of 
  gravity. 
  

  

  The 
  later 
  orotechnic 
  force 
  has 
  imposed 
  schistose 
  structure 
  

   in 
  these 
  zones 
  of 
  comminution 
  just 
  as 
  in 
  the 
  sedimentary 
  

   members 
  of 
  the 
  upper 
  series. 
  

  

  Behavior 
  of 
  the 
  complex. 
  — 
  How 
  have 
  the 
  crystalline 
  rocks 
  

   of 
  the 
  basement 
  complex 
  yielded 
  to 
  the 
  tremendous 
  stresses 
  

   which 
  produced 
  the 
  buckled 
  folds 
  in 
  the 
  upper 
  series 
  ? 
  This 
  

   most 
  interesting 
  question 
  must 
  be 
  left 
  incompletely 
  answered. 
  

   A 
  few 
  points, 
  however, 
  are 
  clear. 
  Great 
  relief 
  was 
  afforded 
  

   by 
  the 
  fault 
  across 
  the 
  northern 
  end 
  of 
  the 
  lake. 
  The 
  dip 
  of 
  

   the 
  fault 
  plane, 
  unfortunately, 
  was 
  not 
  observed, 
  but 
  it 
  is 
  con- 
  

   ceived 
  that 
  the 
  movement 
  was 
  essentially 
  horizontal, 
  and 
  that 
  

   the 
  6000 
  feet 
  of 
  observed 
  throw 
  is 
  nearly 
  the 
  full 
  measure 
  

   of 
  its 
  amount. 
  In 
  the 
  zone 
  adjacent 
  to 
  the 
  Steep 
  Rock 
  Series, 
  

   in 
  which 
  alone 
  the 
  granites 
  were 
  studied, 
  the 
  presence 
  of 
  

   numerous 
  folded 
  dikes, 
  in 
  the 
  localities 
  in 
  which 
  the 
  whole 
  

   series 
  has 
  been 
  specially 
  folded, 
  seems 
  to 
  show 
  that 
  the 
  granites 
  

  

  yielded 
  by 
  bend- 
  

   ing 
  and 
  not 
  by 
  

   faulting. 
  One 
  of 
  

   these 
  is 
  shown 
  in 
  

   figure 
  4. 
  It 
  is 
  

   one 
  of 
  many 
  seen 
  

   in 
  the 
  stretch 
  of 
  

   shore 
  north 
  of 
  Wie- 
  

   gand's 
  Point. 
  This 
  

   bending 
  in 
  the 
  

   granites 
  implies, 
  

   of 
  course, 
  accord- 
  

   ing 
  to 
  Heim's 
  law, 
  

   a 
  tremendous 
  load 
  

   upon 
  them. 
  

  

  Th 
  ickn 
  ess. 
  — 
  Th 
  e 
  

   thickness 
  of 
  the 
  

   members 
  of 
  the 
  

   Steep 
  Rock 
  series 
  

   given 
  in 
  the 
  de- 
  

   scription 
  of 
  the 
  

   separate 
  formations, 
  is 
  that 
  measured 
  in 
  the 
  section 
  across 
  East 
  

   Bay, 
  and 
  is 
  undoubtedly 
  too 
  great. 
  This 
  part 
  of 
  the 
  series 
  

   underwent 
  tremendous 
  longitudinal 
  compression 
  by 
  the 
  cleav- 
  

   age-producing 
  force 
  ; 
  the 
  thinly 
  bedded 
  members' 
  have 
  been 
  

   thrown 
  into 
  little 
  compressed 
  folds, 
  and 
  the 
  more 
  massive 
  

   members 
  have 
  been 
  contorted 
  on 
  a 
  larger 
  scale. 
  In 
  both 
  ways 
  

  

  Fig. 
  4. 
  — 
  Plan 
  of 
  folded 
  Dike. 
  a= 
  Greenstone 
  

   Dike. 
  & 
  = 
  Chloritic 
  gneiss, 
  antoclastic 
  from 
  

   granite. 
  The 
  surface 
  dips 
  gently 
  to 
  the 
  North, 
  

   15°. 
  

  

  