﻿1364.] 
  HONEYMAN 
  ARTSAIG, 
  NOVA 
  SCOTIA. 
  337 
  

  

  be 
  traced 
  for 
  some 
  distance 
  into 
  the 
  sea, 
  making 
  the 
  shore 
  rough 
  

   and 
  dangerous. 
  To 
  the 
  west 
  of 
  Arisaig 
  Pier 
  the 
  line 
  of 
  trap 
  is 
  in- 
  

   terrupted, 
  and 
  a 
  small 
  bay 
  has 
  been 
  formed 
  by 
  the 
  denudation 
  of 
  the 
  

   strata. 
  The 
  strata 
  on 
  the 
  shore 
  are 
  consequently 
  inclined 
  more 
  or 
  

   less 
  in 
  proportion 
  to 
  their 
  distance 
  from 
  the 
  pier. 
  At 
  a 
  certain 
  

   distance 
  they 
  are 
  inclined 
  at 
  low 
  angles, 
  and 
  in 
  some 
  cases 
  they 
  are 
  

   horizontal. 
  About 
  a 
  mile 
  from 
  the 
  pier, 
  the 
  strata 
  on 
  the 
  shore 
  

   again 
  give 
  evidence 
  of 
  disturbance, 
  at 
  no 
  great 
  distance 
  seaward, 
  

   although 
  the 
  cause 
  is 
  not 
  visible. 
  At 
  the 
  extreme 
  of 
  the 
  group, 
  

   south-west 
  of 
  the 
  pier, 
  trap 
  (amygdaloid) 
  again 
  appears 
  in 
  immediate 
  

   contact 
  with 
  strata 
  of 
  the 
  uppermost 
  member 
  of 
  the 
  series, 
  upheaving 
  

   and 
  overlying 
  the 
  strata 
  at 
  the 
  point 
  of 
  contact. 
  It 
  again 
  appears 
  

   at 
  intervals, 
  constituting 
  the 
  shore-boundary 
  of 
  the 
  Carboniferous 
  

   formation 
  : 
  the 
  trap 
  (a') 
  on 
  the 
  opposite 
  side 
  of 
  the 
  group 
  appears 
  

   between 
  the 
  mountain-range 
  and 
  the 
  intervening 
  Carboniferous 
  con- 
  

   glomerate 
  and 
  limestone, 
  and 
  again 
  between 
  a 
  part 
  of 
  the 
  latter 
  and 
  

   our 
  Silurian 
  strata. 
  I 
  also 
  observed 
  it 
  at 
  other 
  points 
  on 
  this 
  side, 
  

   between 
  the 
  strata 
  and 
  the 
  mountain-range, 
  as 
  indicated 
  in 
  the 
  Map. 
  

   At 
  varying 
  distances 
  from 
  these 
  intruded 
  rocks 
  I 
  found 
  the 
  strata 
  

   particularly 
  disturbed, 
  so 
  that 
  the 
  group 
  may 
  be 
  regarded, 
  on 
  the 
  

   whole, 
  as 
  synclinal, 
  the 
  direction 
  of 
  the 
  axis 
  being 
  very 
  irregular 
  

   and 
  generally 
  obscure 
  ; 
  but 
  the 
  axis 
  is 
  seen 
  approximately 
  near 
  the 
  

   mouth 
  of 
  Doctor's 
  Brook, 
  at 
  Arisaig 
  Brook, 
  and 
  M< 
  Adam's 
  Brook. 
  

   I 
  purpose 
  now 
  to 
  illustrate 
  the 
  subject 
  more 
  fully 
  by 
  means 
  of 
  three 
  

   sections. 
  

  

  § 
  3. 
  Section 
  from 
  North 
  to 
  South. 
  

  

  The 
  first 
  section 
  (fig. 
  2) 
  intersects 
  the 
  district 
  from 
  north 
  to 
  south, 
  

   at 
  about 
  one 
  mile 
  from 
  its 
  eastern 
  side. 
  The 
  trap 
  (a) 
  of 
  the 
  north 
  

   of 
  the 
  section 
  is 
  well 
  exposed 
  along 
  the 
  shore, 
  and 
  forms 
  an 
  inter- 
  

   esting 
  study. 
  It 
  is 
  often 
  vesicular, 
  amygdaloidal, 
  and 
  porphyritic, 
  

   and 
  is 
  frequently 
  associated 
  with 
  tufa 
  and 
  tufaceous 
  conglomerate, 
  

   and 
  interesting 
  alterations 
  of 
  the 
  sedimentary 
  strata 
  are 
  seen 
  at 
  its 
  

   various 
  exposed 
  points 
  of 
  contact 
  with 
  them. 
  These 
  sedimentary 
  

   rocks 
  lose 
  all 
  semblance 
  of 
  stratification, 
  being 
  sometimes 
  hardly 
  

   distinguishable 
  from 
  the 
  trap 
  itself, 
  sometimes 
  assuming 
  a 
  somewhat 
  

   granitoid 
  aspect, 
  at 
  others 
  jaspideous, 
  or 
  beautifully 
  turbinated, 
  as 
  

   if 
  replete 
  with 
  organisms, 
  in 
  every 
  case 
  signs 
  of 
  organic 
  existence 
  

   being 
  thoroughly 
  obliterated. 
  

  

  The 
  upper 
  part 
  of 
  the 
  bed 
  A 
  (fig. 
  2) 
  has 
  an 
  interest 
  of 
  a 
  different 
  

   kind 
  ; 
  it 
  lies 
  in 
  the 
  cove 
  opposite 
  the 
  break 
  in 
  the 
  line 
  of 
  trap, 
  to 
  which 
  

   I 
  have 
  already 
  referred, 
  and, 
  although 
  tilted, 
  the 
  stratification 
  is 
  

   preserved, 
  and 
  contains 
  many 
  organisms. 
  The 
  lower 
  part 
  contains 
  

   several 
  patches 
  of 
  fossiliferous 
  limestone 
  ; 
  the 
  vertical 
  sections 
  of 
  

   these 
  are 
  generally 
  plano-convex, 
  with 
  a 
  maximum 
  thickness 
  of 
  six 
  

   inches. 
  This 
  limestone 
  is 
  very 
  much 
  hardened, 
  and 
  contains 
  

   throughout 
  beautiful 
  crystals 
  of 
  iron-pyrites. 
  These 
  strata, 
  which 
  

   are 
  about 
  200 
  feet 
  thick, 
  have, 
  in 
  addition 
  to 
  the 
  fossils 
  found 
  in 
  

   the 
  beds 
  just 
  referred 
  to, 
  separate 
  organisms, 
  scattered 
  abundantly 
  

   through 
  them 
  from 
  the 
  bottom 
  to 
  the 
  top. 
  The 
  fossils 
  of 
  this 
  

  

  