﻿Pirsson 
  and 
  Yaughan 
  — 
  Deep 
  Boring 
  in 
  Bermuda. 
  71 
  

  

  that 
  we 
  have 
  been 
  given 
  the 
  opportunity 
  of 
  using 
  this 
  material 
  

   in 
  addition 
  to 
  our 
  own. 
  

  

  Situation 
  and 
  Nature 
  of 
  the 
  Boring. 
  — 
  The 
  site 
  of 
  the 
  bor- 
  

   ing 
  is 
  in 
  the 
  parish 
  of 
  Southampton, 
  on 
  the 
  slope 
  of 
  a 
  hill 
  

   nearly 
  a 
  mile 
  west 
  of 
  the 
  lighthouse 
  on 
  Gibb's 
  Hill. 
  The 
  

   spot 
  selected 
  is 
  about 
  200 
  feet 
  above 
  sea-level. 
  The 
  method 
  

   of 
  boring 
  was 
  not 
  that 
  of 
  the 
  diamond 
  drill 
  by 
  which 
  a 
  solid 
  

   core 
  is 
  obtained, 
  but 
  by 
  the 
  use 
  of 
  a 
  drill 
  which 
  is 
  raised 
  and 
  

   dropped, 
  a 
  method 
  commonly 
  used 
  in 
  boring 
  oil 
  wells. 
  In 
  

   this 
  case, 
  the 
  material 
  is 
  removed 
  in 
  the 
  form 
  of 
  a 
  coarse 
  

   powder. 
  Fortunately, 
  in 
  placing 
  the 
  casing, 
  occasional 
  chips 
  

   of 
  the 
  rocks 
  are 
  broken 
  off 
  and 
  obtained, 
  and 
  this 
  has 
  furnished 
  

   some 
  material 
  of 
  a 
  size 
  sufficient 
  for 
  the 
  making 
  of 
  thin 
  sec- 
  

   tions, 
  and 
  thus 
  for 
  petrographic 
  study 
  in 
  the 
  usual 
  manner. 
  

   At 
  the 
  time 
  when 
  the 
  well 
  was 
  visited 
  by 
  one 
  of 
  us, 
  the 
  boring 
  

   was 
  down 
  800 
  feet 
  ; 
  since 
  then 
  it 
  has 
  been 
  continued 
  over 
  600 
  

   feet 
  more, 
  making 
  a 
  total 
  depth 
  of 
  over 
  1400 
  feet. 
  

  

  Summary 
  of 
  Results. 
  — 
  Very 
  briefly 
  stated 
  for 
  this 
  prelim- 
  

   inary 
  paper, 
  it 
  may 
  be 
  said 
  that 
  of 
  the 
  1400 
  feet 
  penetrated 
  by 
  

   the 
  boring, 
  the 
  first 
  360 
  feet 
  are 
  in 
  the 
  limestones 
  of 
  the 
  usual 
  

   character 
  known 
  in 
  Bermuda. 
  Below 
  them 
  for 
  200 
  feet, 
  soft 
  

   yellowish 
  to 
  brown, 
  often 
  clay-like 
  rocks 
  are 
  met, 
  whose 
  nature 
  

   indicates 
  that 
  they 
  are 
  more 
  or 
  less 
  decomposed 
  volcanic 
  tuffs. 
  

   Below 
  them 
  blackish 
  to 
  gray 
  compact 
  volcanic 
  rocks 
  are 
  found, 
  

   of 
  andesitic 
  and 
  basaltic 
  appearance. 
  The 
  study 
  of 
  the 
  section 
  

   made 
  from 
  a 
  chip 
  indicates 
  that 
  this 
  is 
  a 
  lava, 
  and, 
  though 
  con- 
  

   siderably 
  altered, 
  an 
  augite-andesite. 
  This 
  rock 
  continues 
  

   without 
  essential 
  change 
  in 
  character 
  for 
  the 
  further 
  800 
  feet 
  

   penetrated. 
  

  

  The 
  geographical 
  situation 
  of 
  Bermuda 
  in 
  the 
  Atlantic 
  

   basin, 
  distant 
  as 
  it 
  is 
  from 
  other 
  islands 
  and 
  the 
  continental 
  

   mass, 
  together 
  with 
  its 
  isolation 
  as 
  a 
  coral 
  island, 
  renders 
  any 
  

   new 
  fact 
  which 
  we 
  may 
  obtain 
  of 
  its 
  geology 
  a 
  matter 
  of 
  par- 
  

   ticular 
  interest 
  and 
  value 
  in 
  several 
  directions. 
  The 
  data 
  

   which 
  our 
  investigation 
  may 
  be 
  expected 
  to 
  furnish 
  will 
  have 
  

   a 
  bearing 
  on 
  the 
  origin 
  of 
  coral 
  islands 
  and 
  certain 
  limestones 
  ; 
  

   while 
  a 
  knowledge 
  of 
  the 
  nature 
  of 
  the 
  underlying 
  lavas 
  of 
  

   the 
  volcano 
  will 
  contribute 
  material 
  toward 
  a 
  better 
  under- 
  

   standing 
  of 
  the 
  problem 
  of 
  the 
  distribution 
  and 
  relation 
  of 
  

   igneous 
  rocks 
  in 
  the 
  Atlantic 
  basin. 
  In 
  addition, 
  Mr. 
  Joseph 
  

   A. 
  Cushman 
  is 
  studying 
  the 
  foraminifera 
  for 
  a 
  report 
  on 
  the 
  

   paleontology. 
  The 
  object 
  of 
  this 
  paper 
  is 
  merely 
  to 
  give 
  a 
  

   preliminary 
  notice 
  of 
  this 
  investigation 
  and 
  of 
  our 
  being 
  at 
  

   work 
  in 
  this 
  field. 
  

  

  New 
  Haven 
  and 
  Washington, 
  June 
  10th, 
  1913. 
  

  

  