﻿324 
  Verrill 
  — 
  Notes 
  on 
  the 
  Geology 
  of 
  the 
  Bermudas. 
  

  

  rises 
  in 
  one 
  place 
  to 
  within 
  8 
  fathoms 
  of 
  the 
  surface 
  of 
  the 
  sea. 
  

   These 
  two 
  peaks 
  and 
  Bermuda 
  are 
  connected 
  together 
  by 
  a 
  

   ridge, 
  covered 
  with 
  water 
  only 
  580 
  to 
  690 
  fathoms 
  deep, 
  while 
  

   the 
  surrounding 
  sea, 
  on 
  all 
  sides, 
  is 
  over 
  2,000 
  fathoms 
  deep. 
  

   The 
  submerged 
  slope 
  of 
  the 
  Bermuda 
  Mountain, 
  on 
  the 
  north 
  

   side, 
  is 
  steeper 
  than 
  that 
  of 
  any 
  known 
  large 
  volcano 
  upon 
  the 
  

   dry 
  land. 
  It 
  falls 
  off 
  1250 
  fathoms 
  in 
  6 
  miles. 
  That 
  is 
  at 
  the 
  

   rate 
  of 
  about 
  1250 
  feet 
  to 
  the 
  mile. 
  The 
  slope 
  of 
  the 
  Argus 
  

   Bank 
  is, 
  on 
  one 
  side, 
  7620 
  feet 
  in 
  10 
  miles. 
  (See 
  fig. 
  4.) 
  

  

  Sea 
  Level 
  

  

  Figure 
  4. 
  — 
  I. 
  Sectional 
  diagram 
  of 
  submerged 
  slope 
  northward 
  from 
  T 
  North 
  

   Rocks 
  (N) 
  ; 
  

  

  II. 
  The 
  same 
  southward 
  from 
  Castle 
  Harbor 
  (C). 
  

  

  III. 
  Sketch 
  map 
  showing 
  the 
  situation 
  of 
  Argus 
  Bank 
  (A); 
  Challenger 
  Bank 
  

   (C) 
  ; 
  and 
  southwestern 
  end 
  of 
  the 
  Bermudas 
  ; 
  Somerset 
  Island 
  (S) 
  ; 
  Ireland 
  

   Island 
  (I); 
  Main 
  Island 
  or 
  Bermuda 
  (B. 
  I.); 
  Hamilton 
  town 
  (H); 
  a, 
  b, 
  line 
  of 
  the 
  

   section 
  shown 
  in 
  IV. 
  

  

  IV". 
  Section 
  through 
  Somerset 
  Island 
  (S), 
  Challenger 
  Bank 
  (C), 
  and 
  Argus 
  

   Bank 
  (A), 
  along 
  the 
  line 
  a, 
  6, 
  in 
  III, 
  

   All 
  soundings 
  are 
  given 
  in 
  fathoms. 
  

  

  Evidences 
  of 
  Subsidence. 
  Figs. 
  1, 
  5, 
  6. 
  

  

  In 
  making 
  the 
  excavation 
  for 
  the 
  great 
  dry 
  dock 
  at 
  Ireland 
  

   Island 
  a 
  bed 
  of 
  peat 
  was 
  found, 
  containing 
  cedar 
  stumps 
  in 
  a 
  

  

  