﻿644 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  extending 
  well 
  up 
  into 
  the 
  interior. 
  Some 
  ridges 
  of 
  anorthosites 
  

   are 
  typical 
  outliers 
  and 
  separated 
  entirely 
  from 
  the 
  interior 
  

   masses. 
  A 
  moment's 
  study 
  of 
  the 
  Elizabethtown, 
  Lewis, 
  Essex, 
  

   Willsborough 
  and 
  Chesterfield 
  maps 
  will 
  bring 
  this 
  out 
  forcibly. 
  

   The 
  parent, 
  plutonic 
  magma 
  developed 
  not 
  alone 
  the 
  central 
  group 
  

   of 
  mountains 
  but 
  sent 
  out 
  great 
  offshoots, 
  at 
  times 
  to 
  very 
  con- 
  

   siderable 
  distances. 
  We 
  can 
  only 
  await 
  with 
  great 
  interest 
  the 
  

   results 
  of 
  further 
  exploration 
  on 
  the 
  west 
  and 
  south, 
  and 
  the 
  

   description 
  of 
  the 
  relations 
  of 
  the 
  three 
  series 
  which 
  will 
  be 
  there 
  

   brought 
  out. 
  

  

  The 
  stratigraphic 
  relations 
  of 
  I 
  and 
  II 
  are 
  less 
  easy 
  to 
  demon- 
  

   strate. 
  Sections 
  BB, 
  CO, 
  DD, 
  and 
  EE, 
  of 
  the 
  Moriah 
  map 
  

   endeavor 
  to 
  reproduce 
  the 
  conditions 
  met. 
  In 
  each 
  case 
  there 
  

   was 
  a 
  fault 
  scarp 
  and 
  valley 
  to 
  complicate 
  matters, 
  but 
  in 
  BB 
  the 
  

   limestones 
  rest 
  on 
  what 
  is 
  regarded 
  as 
  a 
  thin 
  representative 
  of 
  the 
  

   gneisses 
  which 
  lies 
  over 
  and 
  under 
  the 
  ore. 
  In 
  section 
  EE, 
  the 
  

   limestones 
  appeared 
  to 
  rest 
  to 
  the 
  southwest 
  on 
  gneiss 
  that 
  showed 
  

   some 
  distance 
  away. 
  The 
  small 
  exposures 
  near 
  the 
  Pilfershire 
  

   mine 
  in 
  Moriah 
  appeared 
  to 
  rest 
  conformably 
  on 
  the 
  gneiss 
  con- 
  

   taining 
  the 
  ore. 
  The 
  large 
  gneiss 
  exposure 
  in 
  central 
  Crown 
  

   Point 
  appeared 
  to 
  have 
  a 
  different 
  strike 
  and 
  dip 
  from 
  the 
  lime- 
  

   stone 
  series 
  at 
  a 
  distance, 
  but 
  the 
  recorded 
  points 
  are 
  so 
  far 
  apart 
  

   that 
  little 
  dependence 
  is 
  to 
  be 
  placed 
  on 
  them. 
  With 
  limited 
  

   exposures 
  and 
  the 
  danger 
  of 
  regarding 
  a 
  gneissic 
  bed 
  that 
  is 
  in 
  

   the 
  limestone 
  series 
  itself 
  as 
  the 
  fundamental 
  gneiss, 
  such 
  evidence 
  

   is 
  not 
  easy 
  to 
  procure. 
  None 
  the 
  less 
  the 
  impression 
  remains 
  very 
  

   strongly 
  after 
  the 
  field 
  work 
  that 
  the 
  same 
  relations 
  hold 
  as 
  have 
  

   been 
  observed 
  in 
  Canada. 
  The 
  same 
  difficulties 
  are 
  met 
  there. 
  

   (See 
  E. 
  D. 
  Adams, 
  Journal 
  of 
  Geology, 
  I, 
  330, 
  331.) 
  Probably 
  in 
  

   New 
  York 
  in 
  the 
  counties 
  more 
  remote 
  from 
  the 
  anorthosites, 
  and 
  

   even 
  in 
  Essex 
  count} 
  7 
  " 
  with 
  more 
  detailed 
  stud}' 
  and 
  exploration, 
  

   greater 
  certainty 
  may 
  be 
  reached. 
  The 
  writer 
  did 
  not 
  feel 
  justified 
  

   in 
  giving 
  the 
  necessary 
  time 
  to 
  these 
  obscure 
  local 
  questions 
  

   until 
  the 
  larger 
  territory 
  had 
  been 
  once 
  gone 
  over 
  and 
  recorded. 
  

   With 
  a 
  wider 
  experience 
  and 
  a 
  knowledge 
  of 
  the 
  crucial, 
  localities, 
  

   this 
  second 
  stage 
  of 
  the 
  work 
  can 
  be 
  entered 
  and 
  more 
  light 
  may 
  

   be 
  thrown 
  on 
  them. 
  The 
  separation 
  on 
  the 
  "map 
  is 
  chiefly 
  based 
  

   on 
  lithological 
  criteria, 
  which 
  are 
  always 
  to 
  be 
  viewed 
  in 
  a 
  con- 
  

   servative 
  spirit. 
  It 
  is 
  quite 
  possible 
  that 
  all 
  these 
  gneisses 
  are 
  to 
  

   be 
  classed 
  in 
  the 
  " 
  Algonkian 
  " 
  of 
  the 
  geologists 
  of 
  the 
  United 
  

  

  