﻿Geology 
  and 
  Mineralogy. 
  323 
  

  

  and 
  compact 
  siliceous 
  slates 
  or 
  phthanite. 
  In 
  a 
  section 
  near 
  

   Pleboule, 
  the 
  beds 
  are 
  represented 
  by 
  Barrois, 
  as 
  standing 
  nearly 
  

   vertical 
  and 
  as 
  conformable 
  with 
  beds 
  of 
  argillyte, 
  granulitic 
  

   gneiss, 
  hornblendic 
  schist, 
  and 
  other 
  rocks. 
  Pebbles 
  of 
  the 
  

   Radiolarian 
  rock 
  are 
  found 
  in 
  the 
  Cambrian 
  conglomera 
  of 
  Mont- 
  

   fort 
  and 
  Erquy 
  and 
  in 
  pre- 
  Cambrian 
  conglomerates 
  at 
  the 
  base 
  

   of 
  the 
  " 
  Phyllades 
  de 
  Saint 
  Lo 
  ;" 
  and 
  from 
  this 
  the 
  conclusion 
  is 
  

   drawn 
  that 
  the 
  Radiolarian 
  beds 
  are 
  at 
  least 
  pre-Cambrian. 
  

  

  5. 
  Geological 
  Survey 
  of 
  Alabama: 
  1894, 
  Report 
  on 
  the 
  Geol- 
  

   ogy 
  of 
  the 
  Coastal 
  Plain 
  of 
  Alabama 
  by 
  E. 
  A. 
  Smith, 
  L. 
  C. 
  

   Johnson 
  and 
  D. 
  W. 
  Langdon, 
  Jr., 
  with 
  contributions 
  to 
  its 
  

   Paleontology, 
  by 
  T. 
  H. 
  Aldkich 
  and 
  K. 
  M. 
  Cunningham, 
  with 
  

   illustrations, 
  pp. 
  i-xxiv, 
  1-759, 
  1894.— 
  The 
  nucleus 
  of 
  the 
  present 
  

   report 
  was 
  published 
  in 
  1887 
  as 
  Bulletin 
  No. 
  43 
  of 
  the 
  IT. 
  S. 
  

   Geological 
  Survey, 
  but 
  the 
  present 
  work 
  contains 
  considerable 
  

   new 
  matter 
  and 
  a 
  revision 
  ot 
  the 
  Bulletin 
  in 
  the 
  light 
  of 
  later 
  

   discoveries. 
  

  

  In 
  the 
  Tertiary 
  part, 
  upon 
  the 
  work 
  of 
  Mr. 
  Johnson, 
  the 
  hori- 
  

   zon 
  of 
  the 
  " 
  Grand 
  Gull 
  " 
  formation 
  has 
  been 
  shown 
  to 
  be 
  of 
  

   Miocene 
  age, 
  and 
  a 
  new 
  formation 
  at 
  its 
  top, 
  has 
  been 
  described 
  

   and 
  its 
  age 
  determined 
  to 
  be 
  also 
  Miocene, 
  by 
  Dr. 
  Dall. 
  

  

  The 
  "Tuscaloosa 
  " 
  formation 
  which 
  was 
  described 
  in 
  the 
  Bulle- 
  

   tin 
  No. 
  4 
  3, 
  but 
  then 
  only 
  doubtfully 
  referred 
  to 
  some 
  place 
  in 
  the 
  

   Cretaceous, 
  and 
  since 
  then 
  referred 
  to 
  the 
  lower 
  Cretaceous,* 
  is 
  

   shown 
  by 
  its 
  fossil 
  plants, 
  discovered 
  in 
  1892 
  and 
  identified 
  by 
  

   Dr. 
  Ward, 
  to 
  be 
  nearly 
  equivalent 
  to 
  the 
  Amboy 
  clays 
  (= 
  Rari- 
  

   tan 
  group, 
  Dakota 
  Epoch), 
  the 
  lower 
  member 
  of 
  the 
  Upper 
  Cre- 
  

   taceous. 
  The 
  specimens 
  identified 
  are 
  of 
  species 
  described 
  from 
  

   the 
  Amboy 
  clays, 
  Dakato 
  group, 
  and 
  Cretaceous 
  of 
  Greenland. 
  

  

  The 
  species 
  of 
  iossils 
  described 
  by 
  Mr. 
  Aldrich 
  are 
  from 
  the 
  

   (Midway) 
  Clayton 
  Tertiary, 
  of 
  the 
  lowest 
  beds 
  of 
  the 
  Eocene. 
  

  

  h. 
  s. 
  w. 
  

  

  6. 
  Paleozoic 
  Corallines. 
  — 
  The 
  first 
  of 
  Paleozoic 
  Alga? 
  of 
  the 
  

   group 
  of 
  Corallines 
  has 
  been 
  described 
  and 
  figured 
  by 
  R. 
  P. 
  

   Whitfield 
  in 
  the 
  Bulletin 
  of 
  the 
  American 
  Museum 
  of 
  Natural 
  

   History, 
  vol. 
  vi, 
  p. 
  351, 
  1894. 
  He 
  names 
  the 
  single 
  species 
  thns 
  

   far 
  discovered 
  Prhnicorcdlina 
  trentonensis. 
  

  

  7. 
  Lehrbuch 
  der 
  Petrographie 
  von 
  Dr. 
  Ferdinand 
  Ziekel. 
  

   Zweite 
  ganzlich 
  neu 
  verfassie 
  Auflage. 
  Dritter 
  Band. 
  833 
  pp. 
  

   large 
  8vo. 
  Leipzig 
  (Wm. 
  Engelmann). 
  — 
  The 
  third 
  volume 
  of 
  

   this 
  exhaustive 
  work 
  appeared 
  near 
  the 
  close 
  of 
  the 
  past 
  year. 
  

   The 
  earlier 
  volumes 
  have 
  been 
  already 
  noticed 
  in 
  this 
  Journal 
  

   and 
  the 
  minute 
  and 
  at 
  the 
  same 
  time 
  comprehensive 
  character 
  of 
  

   the 
  whole 
  has 
  been 
  dwelt 
  upon. 
  The 
  opening 
  part 
  of 
  this 
  third 
  

   volume 
  discusses 
  the 
  rocks 
  containing 
  a 
  lime-soda 
  feldspar 
  with 
  

   nephelite 
  or 
  leucite 
  ; 
  those 
  with 
  nephelite, 
  leucite, 
  or 
  melilite 
  

   without 
  feldspar, 
  and 
  those 
  containing 
  no 
  constituent 
  correspond- 
  

   ing 
  to 
  feldspar. 
  The 
  crystalline 
  schists 
  are 
  then 
  taken 
  up, 
  also 
  

   the 
  crystalline 
  rocks 
  of 
  simple 
  mineralogical 
  character 
  ; 
  then 
  

  

  * 
  Dana's 
  Manual 
  of 
  Geology, 
  4th 
  edition, 
  1895, 
  p. 
  816. 
  

  

  