﻿430 
  Scientific 
  Intelligence. 
  

  

  2. 
  Geological 
  Survey 
  of 
  Texas, 
  2nd 
  Annual 
  Report, 
  1890. 
  

   E. 
  T. 
  Dumble, 
  State 
  Geologist. 
  756 
  pp. 
  8vo, 
  with 
  maps, 
  plates 
  

   and 
  sections. 
  Austin, 
  Texas, 
  1891. 
  — 
  The 
  introductory 
  chapter 
  

   of 
  this 
  second 
  Annual 
  Report 
  by 
  Mr. 
  Dumble 
  reviews 
  the 
  work 
  

   of 
  the 
  year, 
  and 
  the 
  subjects 
  of 
  metallic 
  and 
  other 
  mineral 
  and 
  

   economical 
  resources 
  of 
  the 
  State. 
  It 
  is 
  followed 
  by 
  an 
  account 
  

   of 
  the 
  geology 
  and 
  resources 
  of 
  the 
  iron 
  ore 
  district 
  of 
  East 
  

   Texas, 
  by 
  E. 
  T. 
  Dumble, 
  Wm. 
  Kenedy, 
  J. 
  H. 
  Herndon 
  and 
  J. 
  

   B. 
  Walker 
  ; 
  on 
  the 
  geology 
  of 
  northwestern 
  Texas, 
  by 
  W. 
  F. 
  

   Cummins 
  ; 
  on 
  the 
  geology 
  and 
  resources 
  of 
  the 
  central 
  mineral 
  

   region 
  of 
  Texas, 
  by 
  T. 
  B. 
  Comstock 
  ; 
  and 
  on 
  the 
  geology 
  and 
  

   mineral 
  resources 
  of 
  Trans-Pecos, 
  Texas, 
  by 
  W. 
  H. 
  von 
  Steeru- 
  

   witz, 
  with 
  a 
  report 
  on 
  the 
  Cretaceous 
  rocks 
  of 
  the 
  region 
  by 
  J. 
  

   A. 
  Taff. 
  

  

  Mr. 
  Cummins, 
  in 
  his 
  account 
  of 
  the 
  Permian 
  — 
  the 
  lower 
  divis- 
  

   ion 
  of 
  the 
  Red 
  Beds, 
  — 
  makes 
  them 
  in 
  places 
  5000 
  feet 
  thick, 
  and 
  

   every 
  where 
  conformable 
  with 
  the 
  Carboniferous. 
  He 
  divides 
  

   the 
  formation 
  into 
  the 
  Wichita 
  or 
  Lower, 
  consisting 
  of 
  sand- 
  

   stones 
  ; 
  the 
  Clear 
  Fork 
  beds, 
  limestones, 
  shales 
  and 
  sandstones, 
  

   and 
  some 
  gypsum 
  ; 
  and 
  the 
  Double 
  Mountain 
  beds, 
  including 
  

   limestones, 
  shales 
  and 
  thick 
  beds 
  of 
  gypsum. 
  The 
  overlying 
  

   Triassic 
  commences 
  with 
  sandstones 
  and 
  conglomerates, 
  which 
  re- 
  

   semble 
  and 
  are 
  supposed 
  to 
  be 
  the 
  equivalent 
  of 
  the 
  Shinarump 
  

   conglomerate 
  of 
  Powell 
  — 
  made 
  the 
  beginning 
  of 
  the 
  Trias 
  by 
  

   Mr. 
  C. 
  D. 
  Walcott. 
  The 
  Permian 
  series 
  is 
  not 
  separable 
  from 
  

   the 
  Triassic 
  by 
  any 
  marked 
  unconformability, 
  yet 
  it 
  is 
  evident, 
  

   Mr. 
  Cummins 
  remarks, 
  that 
  there 
  was 
  not 
  continuous 
  sedimenta- 
  

   tion 
  between 
  the 
  two. 
  

  

  3. 
  Preliminary 
  Notice 
  of 
  a 
  New 
  Yttrium- 
  Silicate 
  ; 
  by 
  W. 
  

   E. 
  Hidden. 
  (Communicated). 
  — 
  Associated 
  with 
  the 
  huge 
  crys- 
  

   tals 
  of 
  gadolinite, 
  with 
  yttrialite 
  and 
  the 
  other 
  yttrium 
  minerals, 
  

   found 
  in 
  Llano 
  County, 
  Texas, 
  two 
  years 
  ago, 
  I 
  have 
  discovered 
  

   a 
  few 
  masses 
  of 
  a 
  new 
  species 
  that 
  is 
  exceedingly 
  rich 
  in 
  the 
  

   yttrium 
  earths. 
  A 
  preliminary 
  examination 
  has 
  shown 
  its 
  den- 
  

   sity 
  to 
  be 
  4-515. 
  Its 
  color 
  is 
  pale 
  drab-green 
  when 
  pure. 
  In 
  

   thin 
  splinters 
  it 
  is 
  perfectly 
  transparent. 
  Its 
  alteration 
  products 
  

   are 
  of 
  a 
  waxy 
  brick-red 
  color 
  and 
  quite 
  easily 
  distinguished 
  from 
  

   those 
  of 
  gadolinite 
  and 
  allanite. 
  It 
  is 
  easily 
  soluble 
  in 
  acids, 
  

   leaving 
  gelatinous 
  silica. 
  The 
  following 
  are 
  the 
  results 
  of 
  an 
  

   unfinished 
  analysis 
  by 
  the 
  writer 
  : 
  

  

  Si0 
  2 
  25-98 
  

  

  Y 
  2 
  3 
  etc 
  Gl-91 
  atomic 
  weight 
  =118. 
  

  

  FeO 
  4-69 
  

  

  UO 
  q 
  0-40 
  

  

  CaO 
  0-19 
  

  

  Ign. 
  loss 
  2'01 
  

  

  No 
  thoria 
  is 
  present 
  and 
  but 
  very 
  little 
  of 
  the 
  cerium 
  earths. 
  

   The 
  oxygen 
  ratio 
  of 
  the 
  bases 
  found 
  to 
  the 
  silica 
  is 
  83*4'7 
  : 
  86*60, 
  

   or 
  pointing 
  to 
  1 
  : 
  1 
  if 
  the 
  analysis 
  had 
  been 
  completed. 
  Its 
  for- 
  

  

  