﻿Geology 
  and 
  Natural 
  History. 
  159 
  

  

  composition, 
  vertical 
  range, 
  and 
  geographical 
  distribution 
  of 
  the 
  

   plants 
  from 
  the 
  lower 
  coals 
  of 
  Henry 
  Count}', 
  Mo. 
  {The 
  Age 
  of 
  

   the 
  Lower 
  Coals 
  of 
  Henry 
  County, 
  Missouri), 
  David 
  White 
  con- 
  

   cludes 
  that 
  the 
  two 
  approximate 
  low 
  coals, 
  which 
  occasionally 
  

   rest 
  on 
  the 
  eroded 
  surface 
  ot 
  the 
  Mississippian 
  series 
  in 
  that 
  

   region, 
  are 
  slightly 
  younger 
  than 
  the 
  Brookville, 
  Clarion, 
  or 
  

   Mazon 
  Creek 
  horizons 
  of 
  the 
  northern 
  bituminous 
  fields, 
  though 
  

   they 
  are 
  perhaps 
  not 
  so 
  young 
  as 
  the 
  middle 
  Kittaning 
  coal. 
  

   Thus 
  the 
  period 
  of 
  the 
  erosion 
  of 
  the 
  Missisippian 
  appears 
  to 
  

   include 
  the 
  time 
  represented 
  by 
  the 
  lower 
  portion 
  of 
  the 
  Lower 
  

   Coal 
  measures 
  and 
  the 
  Pottsville 
  series, 
  a 
  succession 
  of 
  sediments 
  

   attaining 
  a 
  thickness 
  of 
  twelve 
  hundred 
  feet 
  in 
  the 
  anthracite 
  

   regions, 
  or 
  over 
  twenty-five 
  hundred 
  feet 
  in 
  the 
  Virginian 
  portion 
  

   of 
  the 
  Appalachian 
  trough. 
  The 
  plants 
  from 
  Missouri 
  are 
  lound 
  

   by 
  Mr. 
  White 
  to 
  be 
  probably 
  nearly 
  contemporaneous 
  with 
  those 
  

   of 
  the 
  D 
  ("Marcy") 
  vein 
  of 
  the 
  northern 
  anthracite 
  fields, 
  but 
  

   are 
  possibly 
  slightly 
  younger. 
  Forty-two 
  of 
  the 
  forty-three 
  

   plant 
  genera 
  and 
  nearly 
  one-half 
  of 
  the 
  species 
  occurring 
  in 
  this 
  

   county 
  are 
  also 
  present 
  in 
  the 
  European 
  basins. 
  A 
  critical 
  com- 
  

   parative 
  examination 
  of 
  the 
  American 
  and 
  of 
  the 
  European 
  floras 
  

   leads 
  the 
  author, 
  who 
  regards 
  the 
  species 
  as 
  generally 
  synchron- 
  

   ous 
  and 
  indicating 
  continental 
  conditions 
  involving 
  greater 
  facili- 
  

   ties 
  for 
  inter-migration 
  than 
  geologists 
  generally 
  admit, 
  to 
  consider 
  

   the 
  Henry 
  County 
  coals 
  as 
  partially 
  contemporaneous 
  with 
  the 
  

   Transition 
  Series 
  between 
  the 
  Upper 
  and 
  the 
  Middle 
  Coal 
  Meas- 
  

   ures 
  of 
  Great 
  Britain, 
  and 
  the 
  Third 
  or 
  Upper 
  Zone 
  of 
  the 
  Valen- 
  

   ciennes 
  series 
  in 
  the 
  Franco-Belgian 
  basin, 
  or 
  as 
  referable 
  to 
  the 
  

   Geislautern 
  beds 
  near 
  the 
  top 
  of 
  the 
  Westphalian 
  (Saarbrucker 
  

   Schichten) 
  of 
  the 
  Rhenish 
  district. 
  

  

  8. 
  The 
  relation 
  of 
  the 
  fauna 
  of 
  the 
  Ithaca 
  group 
  to 
  the 
  f 
  annas 
  

   of 
  the 
  Portage 
  and 
  Chemung 
  • 
  by 
  Edward 
  M. 
  Kindle. 
  Bull. 
  

   Am. 
  Paleontology, 
  vol. 
  2, 
  No. 
  6 
  ; 
  pp. 
  1-56, 
  with 
  two 
  plates. 
  

   Dec. 
  1896. 
  — 
  This 
  is 
  an 
  admirable 
  example 
  of 
  what 
  can 
  be 
  done 
  

   by 
  an 
  exhaustive 
  study 
  of 
  the 
  fossil 
  iaunas 
  of 
  a 
  single 
  restricted 
  

   area. 
  The 
  author 
  has 
  taken 
  as 
  his 
  thesis 
  the 
  determination 
  of 
  the 
  

   disputed 
  question 
  whether 
  the 
  fauna 
  ol 
  the 
  Ithaca 
  group 
  should 
  

   be 
  ranked 
  with 
  the 
  Portage 
  or 
  Chemung. 
  He 
  has 
  given 
  a 
  con- 
  

   cise 
  review 
  of 
  previous 
  discussions 
  over 
  the 
  general 
  and 
  particular 
  

   points 
  involved. 
  

  

  He 
  has 
  collected 
  the 
  fossils 
  from 
  over 
  80 
  different 
  stations 
  in 
  

   the 
  locality 
  representing 
  the 
  faunas 
  under 
  discussion, 
  and 
  has 
  iden- 
  

   tified 
  all 
  the 
  species, 
  compared 
  the 
  fossils, 
  tabulated 
  their 
  range 
  

   upward 
  and 
  downward 
  in 
  the 
  general 
  section, 
  thus 
  strongly 
  sup- 
  

   porting 
  by 
  a 
  compact 
  scientific 
  argument 
  his 
  conclusion 
  that 
  " 
  the 
  

   Ithaca 
  fauna 
  should 
  be 
  classed 
  in 
  the 
  Portage 
  epoch." 
  

  

  h. 
  s. 
  w. 
  

  

  9. 
  The 
  Phosphate-Deposits 
  of 
  Arkansas 
  • 
  by 
  John 
  C. 
  Bran- 
  

   nee. 
  (Read 
  before 
  the 
  Am. 
  Inst. 
  Min. 
  Eng. 
  at 
  Colorado 
  meet- 
  

   ing, 
  Sept. 
  1896.)— 
  The 
  author, 
  late 
  State 
  Geologist 
  of 
  Arkansas, 
  

   has 
  presented 
  in 
  this 
  paper 
  a 
  concise 
  statement 
  of 
  the 
  present 
  

  

  