﻿Geology. 
  347 
  

  

  this 
  decay. 
  The 
  apparent 
  conformity 
  in 
  foliation 
  is 
  due 
  to 
  the 
  

   shearing 
  action 
  consequent 
  on 
  the 
  slipping 
  movement. 
  

  

  About 
  Iron 
  Mountain, 
  Missouri, 
  Mr. 
  Pumpelly 
  observed, 
  in 
  

   1873, 
  evidence 
  of 
  ancient 
  disintegration, 
  and 
  pointed 
  out 
  a 
  con- 
  

   glomerate 
  at 
  the 
  base 
  of 
  the 
  mountain 
  as 
  of 
  Silurian 
  age, 
  and 
  a 
  

   result 
  of 
  pre-Silurian 
  disintegration. 
  Borings 
  recently 
  made 
  by 
  

   Prof. 
  W. 
  B. 
  Potter 
  have 
  resulted 
  in 
  the 
  discovery 
  of 
  extensive 
  

   areas 
  of 
  residuary 
  ore-fragments 
  lying 
  on 
  the 
  pre-Silurian 
  sur- 
  

   face. 
  

  

  Mr. 
  Pumpelly 
  has 
  under 
  investigation 
  the 
  Archaean 
  rocks 
  of 
  

   New 
  England 
  and 
  their 
  relations 
  to 
  the 
  associated 
  rocks, 
  and 
  his 
  

   paper 
  shows 
  that 
  he 
  has 
  already 
  reached 
  results 
  of 
  great 
  import- 
  

   ance. 
  

  

  6. 
  The 
  Grey 
  lock 
  Synclinorium 
  ; 
  T. 
  Nelson 
  Dale 
  (American 
  

   Geologist, 
  July, 
  1891). 
  — 
  This 
  paper 
  is 
  an 
  abstract 
  of 
  a 
  Report 
  to 
  

   R. 
  Pumpelly, 
  II. 
  S. 
  Geological 
  Survey. 
  The 
  chief 
  conclusion 
  

   confirms 
  the 
  view 
  of 
  Emmons 
  and 
  later 
  observers 
  that 
  the 
  Grey- 
  

   lock 
  mountain 
  mass 
  is 
  synclinal 
  in 
  general 
  structure. 
  The 
  

   author 
  makes 
  it 
  a 
  combination 
  of 
  synclinals 
  and 
  anticlinals, 
  but 
  

   chiefly 
  of 
  two 
  large 
  synclinals. 
  His 
  paper 
  is 
  illustrated 
  by 
  one 
  

   of 
  the 
  several 
  sections 
  which 
  will 
  appear 
  in 
  the 
  full 
  report. 
  

  

  *l. 
  Report 
  on 
  the 
  Arkansas 
  Geological 
  Survey 
  for 
  1888, 
  Vol. 
  

   IV. 
  John 
  C. 
  Branner, 
  State 
  Geologist. 
  262 
  pp. 
  8vo, 
  with 
  

   many 
  plates. 
  Little 
  Rock, 
  Ark., 
  1891. 
  — 
  This 
  concluding 
  volume 
  

   of 
  the 
  Report 
  for 
  1888, 
  is 
  occupied 
  with 
  an 
  account 
  of 
  the 
  

   geology 
  of 
  Washington 
  Co., 
  by 
  F. 
  W. 
  Simonds, 
  Assistant 
  Geolo- 
  

   gist, 
  and 
  a 
  list 
  of 
  the 
  plants 
  of 
  Arkansas 
  by 
  J. 
  C. 
  Branner 
  and 
  

   F. 
  P. 
  Coville. 
  The 
  rocks 
  include 
  four 
  strata 
  of 
  limestone 
  alter- 
  

   nating 
  with 
  sandstones 
  and 
  shales 
  of 
  the 
  Lower 
  Carboniferous 
  

   (Subcarboniferous), 
  with 
  a 
  thin 
  stratum 
  of 
  shale 
  at 
  the 
  base, 
  

   probably 
  Devonian, 
  and 
  the 
  Millstone 
  Grit, 
  of 
  the 
  " 
  Barren 
  Coal 
  

   Measures," 
  at 
  the 
  top. 
  The 
  lowest 
  limestone 
  abounds 
  in 
  chert. 
  

   The 
  greatest 
  thickness 
  given 
  for 
  the 
  Millstone 
  grit 
  is 
  500 
  feet, 
  

   and 
  for 
  the 
  formations 
  below 
  less 
  than 
  300 
  feet. 
  

  

  8. 
  Tungsten 
  minerals 
  in 
  Canada; 
  by 
  W. 
  F. 
  Fereier, 
  Geol. 
  

   Survey 
  of 
  Canada. 
  Communicated 
  by 
  permission 
  of 
  the 
  Director, 
  

   Alfred 
  R. 
  C. 
  Selwyn. 
  — 
  I 
  have 
  lately 
  made 
  an 
  interesting 
  dis- 
  

   covery 
  of 
  tungsten 
  minerals 
  at 
  a 
  Canadian 
  locality, 
  some 
  of 
  them 
  

   occurring 
  in 
  remarkably 
  fine 
  crystals. 
  This 
  is 
  the 
  first 
  time 
  

   that 
  this 
  metal 
  has 
  been 
  noted 
  in 
  Canada. 
  A 
  detailed 
  descrip- 
  

   tion 
  is 
  in 
  preparation 
  and 
  will 
  shortly 
  appear. 
  

  

  Geological 
  Survey 
  of 
  Canada, 
  Ottawa. 
  

  

  III. 
  Botany. 
  

  

  1. 
  Some 
  Museums 
  and 
  Botanical 
  Gardens 
  in 
  the 
  Equatorial 
  

   Belt 
  and 
  in 
  the 
  South 
  Seas 
  (Third 
  Paper). 
  — 
  Before 
  describing 
  

   the 
  remaining 
  gardens 
  in 
  Australasia, 
  it 
  will 
  be 
  well 
  to 
  make 
  

   mention 
  of 
  the 
  Technological 
  Museum 
  at 
  Sydney, 
  which 
  contains 
  

   illustrations 
  of 
  the 
  valuable 
  treatise 
  on 
  the 
  useful 
  plants 
  of 
  Aus- 
  

  

  