﻿Geology 
  and 
  Mineralogy. 
  489 
  

  

  topographic 
  surveys, 
  $350,000 
  ; 
  water 
  resources, 
  $150,000 
  ; 
  

   resources 
  of 
  Alaska, 
  $100,000; 
  mineral 
  resources 
  of 
  the 
  United 
  

   States, 
  $75,000. 
  Special 
  features 
  of 
  the 
  Survey's 
  activity 
  are 
  the 
  

   discovery 
  and 
  development 
  of 
  new 
  oil 
  fields, 
  the 
  zealous 
  search 
  

   for 
  potash 
  — 
  particularly 
  in 
  the 
  "Red 
  Beds" 
  of 
  the 
  Southwest 
  — 
  , 
  

   the 
  completion 
  of 
  fundamental 
  studies 
  by 
  G. 
  K. 
  Gilbert 
  on 
  

   erosion 
  and 
  sedimentation 
  involved 
  in 
  the 
  problem 
  of 
  California 
  

   mining 
  debris, 
  and 
  the 
  enlargement 
  of 
  the 
  scope 
  of 
  the 
  committee 
  

   on 
  physiography. 
  h. 
  e. 
  g. 
  

  

  2. 
  Publications 
  of 
  the 
  United 
  States 
  Geological 
  Survey, 
  George 
  

   Otis 
  Smith, 
  Director. 
  — 
  Further 
  publications 
  of 
  the 
  Survey 
  (see 
  

   also 
  pp. 
  418, 
  419 
  of 
  the 
  May 
  number) 
  are 
  noted 
  below: 
  

  

  Geologic 
  Atlas, 
  Folios. 
  — 
  No. 
  202. 
  Eureka 
  Springs-Harrison 
  

   Folio, 
  Arkansas-Missouri 
  ; 
  by 
  A. 
  H. 
  Purdue 
  and 
  H. 
  D. 
  Miser. 
  

   Pp.21; 
  2 
  pis. 
  topography, 
  2 
  pis. 
  areal 
  geology, 
  1 
  pi. 
  structure 
  

   sections, 
  13 
  text 
  figs. 
  

  

  No, 
  204. 
  Tolchester 
  Folio, 
  Maryland; 
  by 
  B. 
  L. 
  Miller, 
  E. 
  B. 
  

   Mathews, 
  A. 
  B. 
  Bibbins 
  and 
  H. 
  P. 
  Little. 
  In 
  cooperation 
  

   with 
  the 
  State 
  of 
  Maryland. 
  Pp. 
  14; 
  1 
  pi. 
  topography, 
  1 
  pi. 
  

   areal 
  geology, 
  1 
  pi. 
  columnar 
  sections, 
  1 
  page 
  of 
  illustrations, 
  3 
  

   text 
  figs. 
  

  

  Professional 
  Papers. 
  — 
  No. 
  98. 
  Shorter 
  Contributions 
  to 
  

   General 
  Geology, 
  1916, 
  Parts 
  Q-T, 
  pp. 
  279-395. 
  

  

  No. 
  102. 
  The 
  Inorganic 
  Constituents 
  of 
  Marine 
  Invertebrates; 
  

   F. 
  W. 
  Clarke 
  and 
  W. 
  C. 
  Wheeler. 
  Pp. 
  56 
  (noticed 
  on 
  p. 
  419). 
  

  

  No. 
  103. 
  Brachyceratops: 
  A 
  Ceratopsian 
  Dinosaur 
  from 
  the 
  

   Two 
  Medicine 
  Formation 
  of 
  Montana; 
  with 
  notes 
  on 
  associated 
  

   Fossil 
  Reptiles; 
  by 
  C. 
  W. 
  Gilmore. 
  Pp. 
  45; 
  4 
  pis., 
  57 
  figs. 
  

  

  No. 
  108. 
  Shorter 
  Contributions 
  to 
  General 
  Geology, 
  1917, 
  

   parts 
  A, 
  B, 
  pp. 
  1-29. 
  

  

  Mineral 
  Resources. 
  1915, 
  Parts 
  I, 
  II. 
  Numerous 
  advance 
  

   chapters. 
  

  

  Bulletins. 
  — 
  No. 
  624. 
  Useful 
  Minerals 
  of 
  the 
  United 
  States; 
  

   compiled 
  by 
  Frank 
  C. 
  Schrader, 
  Ralph 
  W. 
  Stone, 
  and 
  Samuel 
  

   Sanford. 
  Revision 
  of 
  Bulletin 
  585. 
  Pp. 
  412. 
  

  

  Nos. 
  640, 
  641. 
  Contributions 
  to 
  Economic 
  Geology, 
  1916. 
  

   640, 
  Part 
  I. 
  J, 
  K, 
  L; 
  641, 
  Part 
  II. 
  F, 
  I, 
  J, 
  K, 
  L. 
  

  

  No. 
  644. 
  Triangulation 
  and 
  Primary 
  Traverse, 
  1913-1915; 
  

   R. 
  B. 
  Marshall, 
  Chief 
  Geographer. 
  Pp. 
  655; 
  2 
  pis. 
  

  

  No. 
  650. 
  Geographic 
  Tables 
  and 
  Formulas. 
  Fourth 
  edition; 
  

   compiled 
  by 
  Samuel 
  S. 
  Gannett. 
  Pp. 
  388, 
  8 
  figs. 
  

  

  No. 
  661. 
  Contributions 
  to 
  Economic 
  Geology, 
  1917, 
  Part 
  II. 
  A. 
  

  

  Water 
  Supply 
  Papers. 
  — 
  Surface 
  Water 
  Supply 
  of 
  the 
  United 
  

   States; 
  Nathan 
  C. 
  Grover, 
  Chief 
  Hydraulic 
  Engineer. 
  No. 
  

   361. 
  1913, 
  Part 
  XL 
  Pacific 
  Slope 
  Basins 
  in 
  California. 
  Pp. 
  

   514, 
  2 
  pis., 
  1 
  fig.— 
  No. 
  392. 
  1914, 
  Part 
  XII. 
  North 
  Pacific 
  

   Drainage 
  Basins: 
  A. 
  Pacific 
  Drainage 
  Basins 
  in 
  Washington 
  

   and 
  upper 
  Columbia 
  River 
  Basin. 
  Pp. 
  200. 
  — 
  No. 
  402. 
  1915^ 
  

   Part 
  II. 
  South 
  Atlantic 
  and 
  Eastern 
  Gulf 
  of 
  Mexico 
  Basins. 
  

   Pp. 
  51 
  with 
  appendix; 
  2 
  pis. 
  — 
  No. 
  407, 
  1915, 
  Part 
  VII. 
  Lower 
  

   Mississippi 
  River 
  Basin. 
  Pp. 
  43 
  and 
  appendix; 
  2 
  pis. 
  

  

  