﻿B. 
  A. 
  Paly 
  — 
  Geology 
  of 
  Pigeon 
  Pointy 
  Minnesota. 
  427 
  

  

  Bayley 
  in 
  the 
  following 
  words 
  (page 
  23 
  of 
  bis 
  paper) 
  : 
  " 
  On 
  

   the 
  north 
  side 
  of 
  the 
  point, 
  at 
  the 
  month 
  of 
  Pigeon 
  river, 
  are 
  

   slates 
  and 
  quartzites, 
  capped 
  by 
  an 
  overflow 
  of 
  a 
  fine-grained 
  

   variety 
  of 
  gabbro." 
  Professor 
  Palache 
  and 
  the 
  writer 
  visited 
  

   that 
  locality 
  and 
  found 
  a 
  dip-section 
  as 
  illustrated 
  in 
  fig. 
  2. 
  

   It 
  happens 
  to 
  be 
  situated 
  where 
  two 
  or 
  more 
  dikes 
  of 
  rela- 
  

   tively 
  fine-grained 
  gabbro 
  merge 
  upward 
  into 
  the 
  main 
  gabbro 
  

   mass, 
  which 
  itself, 
  at 
  least 
  locally, 
  has 
  a 
  concordant, 
  sill 
  con- 
  

   tact 
  with 
  the 
  quartzite-metargillite 
  series. 
  In 
  the 
  face 
  of 
  a 
  

   steep 
  cliff, 
  300 
  meters 
  east 
  of 
  the 
  fig. 
  2 
  locality 
  and 
  in 
  the 
  line 
  

  

  Fig. 
  2. 
  

  

  N. 
  

  

  Lake 
  Level 
  

  

  20 
  

  

  •q-O 
  METERS 
  

  

  Fig. 
  2. 
  Section 
  of 
  floor 
  contact 
  of 
  sill, 
  near 
  mouth 
  of 
  Pigeon 
  river. 
  Gab- 
  

   bro 
  dikes 
  (dotted) 
  pass 
  upward 
  into 
  the 
  sill 
  gabbro 
  (dotted). 
  Q, 
  Animikie 
  

   sediments. 
  Observed 
  contacts 
  shown 
  by 
  continuous 
  lines 
  ; 
  inferred 
  contacts, 
  

   bv 
  broken 
  lines. 
  

  

  of 
  Bayley's 
  north-south 
  section 
  " 
  a—~b" 
  the 
  exact 
  contact 
  was 
  

   again 
  found, 
  about 
  20 
  meters 
  above 
  lake-level. 
  It 
  could 
  be 
  

   traced 
  for 
  about 
  25 
  meters 
  along 
  the 
  strike. 
  Throughout 
  this 
  

   stretch 
  the 
  contact 
  surface 
  dips 
  gently 
  southward, 
  rigorously 
  

   parallel 
  to 
  bedding 
  in 
  the 
  sediments 
  except 
  for 
  strictly 
  local- 
  

   ized 
  and 
  quite 
  minute 
  transgressions, 
  such 
  as 
  are 
  common 
  at 
  

   most 
  sill 
  contacts. 
  

  

  At 
  the 
  only 
  other 
  area 
  of 
  sediments 
  exposed 
  in 
  the 
  peninsula, 
  

   north 
  of 
  the 
  main 
  gabbro 
  ( 
  u 
  A 
  " 
  in 
  fig. 
  1), 
  the 
  surface 
  of 
  con- 
  

   tact 
  cannot 
  be 
  located 
  within 
  a 
  stratigraphically 
  vertical 
  interval 
  

   of 
  about 
  3 
  meters. 
  On 
  the 
  small 
  headland 
  the 
  quartzites 
  have 
  

   their 
  regional, 
  southward 
  dip 
  of 
  10° 
  to 
  15°. 
  They 
  are 
  cut 
  by 
  

   several 
  trap 
  dikes, 
  one 
  of 
  which 
  is 
  composite.* 
  A 
  few 
  meters 
  

  

  * 
  The 
  well-exposed 
  composite 
  dike 
  runs 
  north 
  and 
  south. 
  The 
  older 
  com- 
  

   ponent 
  is 
  a 
  fresh 
  diabase 
  porphyrite, 
  free 
  from 
  both 
  olivine 
  and 
  quartz. 
  Its 
  

   width 
  measures 
  about 
  2 
  meters 
  over 
  all, 
  that 
  is, 
  including 
  the 
  enclosed 
  

  

  