﻿110 
  J. 
  D. 
  Dana 
  — 
  Features 
  of 
  non-volcanic 
  Igneous 
  Ejections. 
  

  

  from 
  east 
  to 
  west, 
  as 
  lie 
  states, 
  by 
  a 
  valley, 
  and 
  in 
  the 
  valley 
  

   there 
  is 
  a 
  spring 
  giving 
  ont 
  a 
  streamlet 
  which 
  flows 
  northward. 
  

   There 
  are 
  gaps 
  in 
  both 
  the 
  southern 
  and 
  northern 
  sides, 
  divid- 
  

   ing 
  them 
  into 
  a 
  series 
  of 
  elevations. 
  These 
  elevations 
  are 
  

   indicated 
  on 
  Percival's 
  map, 
  so 
  as 
  to 
  look 
  as 
  if 
  he 
  regarded 
  

   them 
  as 
  separate 
  dikes 
  ; 
  but 
  this 
  is 
  contrary 
  to 
  the 
  description 
  

   in 
  his 
  Report. 
  I 
  have 
  looked 
  for 
  sandstone 
  in 
  two 
  of 
  the 
  gaps 
  

   of 
  the 
  south 
  side, 
  east 
  of 
  the 
  " 
  neck," 
  and 
  have 
  found 
  evidence 
  

   in 
  each 
  that 
  the 
  trap 
  is 
  continuous, 
  and 
  descends 
  in 
  these 
  gaps 
  

   nearly 
  half 
  way 
  to 
  the 
  base 
  of 
  the 
  mountain. 
  In 
  the 
  east-and- 
  

   west 
  valley 
  the 
  spring 
  and 
  streamlet 
  are 
  probable 
  evidence 
  

   that 
  there 
  is 
  sandstone 
  beneath 
  ; 
  and 
  on 
  this 
  ground, 
  it 
  may 
  

   be 
  that 
  there 
  are, 
  in 
  this 
  eastern 
  part 
  of 
  Mt. 
  Carmel, 
  two 
  

   parallel 
  east- 
  and- 
  west 
  dikes. 
  

  

  Mt. 
  Carmel 
  appears 
  to 
  be 
  a 
  combination 
  of 
  dikes, 
  without 
  

   the 
  "buried 
  volcanoes" 
  supposed 
  to 
  exist 
  there 
  by 
  Professor 
  

   Davis. 
  In 
  the 
  view 
  from 
  the 
  west 
  side 
  of 
  Mill 
  River 
  there 
  

   are 
  in 
  sight 
  nearly 
  600 
  feet 
  in 
  height 
  of 
  massive 
  trap, 
  having 
  no 
  

   subdivision 
  into 
  sheets 
  or 
  layers, 
  and 
  nothing 
  to 
  suggest 
  the 
  

   idea 
  of 
  lava- 
  streams 
  in 
  the 
  depths 
  below. 
  

  

  The 
  union 
  in 
  this 
  small 
  ridge 
  of 
  approximately 
  north-and- 
  

   south 
  and 
  east-and-west 
  courses 
  is 
  further 
  proof 
  of 
  their 
  

   mutual 
  dependence 
  in 
  the 
  system 
  of 
  movements 
  attending 
  the 
  

   Jura-Trias 
  mountain-making 
  of 
  the 
  Connecticut 
  Valley. 
  But 
  

   its 
  origin 
  remains 
  unexplained. 
  

  

  Concluding 
  Remarks. 
  — 
  A 
  review 
  of 
  the 
  principal 
  conclu- 
  

   sions 
  in 
  this 
  paper 
  is 
  given 
  in 
  its 
  introductory 
  remarks 
  (page 
  

   82), 
  and 
  a 
  recapitulation 
  here 
  is 
  therefore 
  unnecessary. 
  

  

  The 
  reader 
  mav 
  have 
  been 
  led 
  to 
  the 
  idea 
  that 
  the 
  author 
  

   would 
  make 
  the 
  West 
  Rock 
  Ridge 
  typical 
  for 
  other 
  ridges 
  of 
  

   like 
  features 
  in 
  the 
  Connecticut 
  Valley 
  region, 
  in 
  disagreement 
  

   with 
  the 
  conclusion 
  of 
  Professor 
  Davis 
  who 
  holds 
  that 
  in 
  the 
  

   case 
  of 
  most 
  of 
  these 
  ridges, 
  if 
  not 
  of 
  all, 
  the 
  trap 
  was 
  poured 
  

   out 
  in 
  one, 
  two 
  or 
  more 
  horizontal 
  sheets, 
  separated, 
  and 
  over- 
  

   laid 
  horizontally, 
  by 
  beds 
  of 
  sandstone, 
  and 
  that 
  the 
  whole 
  was 
  

   afterward 
  faulted 
  and 
  tilted 
  so 
  as 
  to 
  make 
  the 
  ridges. 
  The 
  

   author 
  acknowledges 
  that 
  he 
  is 
  inclined 
  to 
  make 
  the 
  conclusions 
  

   he 
  has 
  reached 
  general. 
  He, 
  however, 
  admits 
  that 
  he 
  has 
  

   not 
  made 
  the 
  structure 
  of 
  the 
  other 
  ridges 
  of 
  the 
  valley 
  a 
  

   special 
  study. 
  He 
  believes 
  his 
  observations 
  sufficient, 
  however, 
  

   to 
  authorize 
  the 
  statement 
  that 
  a 
  more 
  intimate 
  knowledge 
  of 
  

   the 
  facts 
  is 
  required 
  before 
  any 
  adverse 
  views 
  can 
  be 
  regarded 
  

   as 
  established. 
  

  

  