FOE    THE    YEARS    1901-1905,   INCLUSIVE.  287 
Rigg-s  (Elmer  S. ) — Continued. 
8.  Dinosaur  footprints  from  Arizona. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  17,  pp.  423-424,  1  fig.,  1904. 
Describes  occurrence  and  character  of  footprints. 
9.  Structure  and  relationships  of  Opisthoccelian  dinosaurs.     Part  II.     The  Bracbio- 
sauridse. 
Field  Col.  Mus.,  Geol.  ser.,  vol.  2,  pp.  229-247,  5  pis.,  1  fig.,  1904. 
Rigg-s  (Elmer  S.)  and  Farrington  (Oliver  Cummings). 
1.  The  Dinosaur  beds  of  the  Grand  River  Valley  of  Colorado. 
Sci.  Am.  Suppl.,  vol.  53,  pp.  22061-22062,  2  figs.,  1902. 
Hitter  (Etienne  A.). 
1.  Le  district  aurifere  de  Cripple  Creek  et  ses  recents  developpements  dans  la  zone 
profonde. 
Ann.  des  Mines,  10°  ser.,  t.  7,  pp.  465-487,  1905. 
Describes  the  general  geology,  the  lithology,  the  veins  and  their  minerals,  and  the  ore  deposits 
of  the  Cripple  Creek  gold  mining  district. 
Hitter  (Wm.  E.). 
1.  Some  observations  bearing  on  the  probable  subsidence  during  recent  geologic 
times  of  the  Island  of  Santa  Catalina  off  the  coast  of  southern  California. 
Science,  new  ser.,  vol.  14,  pp.  575-577,  1901. 
Rivers  (J.  J.). 
1.  Descriptions  of  some  undescribed  fossil  shells  of  Pleistocene  and  Pliocene  forma- 
tions of  the  Santa  Monica  Range  [California] 
So.  Cal.  Acad.  Sci.,  Bull.,  vol.  3,  pp.  69-72,  1904. 
Robbins  (F.). 
1.  Ore  occurrence  at  Leadville,  Colo. 
Mg.  &  Sci.  Press,  vol.  86,  p.  168,  1903. 
Describes  the  general  stratigraphy  of  the  region  and  the  occurrence  of  the  ore  bodies. 
Roberts  (Milnor). 
1.  Note  on  the  action  of  frost  on  soil. 
Jour.  Geol.,  vol.  11,  pp.  314-317,  4  rigs.,  1903. 
Roberts  (Milnor),  Landes  (Henry),  Thyng-  (William  S. ),  Lyon  (D.  A.),  and. 
1.  The  metalliferous  resources  of  Washington,  except  iron. 
See  Landes  (H.),  Thyng  (W.  S.),  Lyon  (D.  A.),  and  Roberts  (M.),  1. 
Robertson  (William  Fleet). 
1.  Summary  report  on  the  valley  of  the  Flathead  River  [British  Columbia]. 
Brit.  Col.,  Ann.  Rept.  Minister  Mines  for  1903,  pp.  79-92,  1904. 
Includes  observations  upon  the  physiography,  geology,  and  economic  resources  of  the  region 
examined. 
2.  Report  on  the  Trout  Lake  mining  division  [British  Columbia]. 
Brit.  Col.,  Ann.  Rept.,  Minister  Mines  for  1903,  pp.  109-124,  1904. 
Includes  observations  upon  the  geology  and  economic  resources  of  the  region. 
3.  Report  on  the  Lardeau  mining  district  [British  Columbia]. 
Brit.  Col.,  Ann.  Rept.,  Minister  Mines  for  1903,  pp.  127-130,  1904. 
Includes  observations  upon  the  geology  of  the  region. 
4.  Petrography  of  rock  samples  from  British  Columbia. 
Brit.  Col.,  Ann.  Rept.,  Minister  Mines  for  1903,  pp.  254-263, 1904. 
Gives  reports  upon  examinations  of  rock  specimens  from  British  Columbia  by  A.  E.  Barlow, 
J.  A.  Dresser,  and  L.  P.  Silver.- 
Robinson  (EL  H.) 
1.  On  octohedrite  and  brookite  from  Brindletown,  North  Carolina. 
Am.  Jour.  Sci.,  4th  ser.,  vol.  12,  pp.  180-184,  6  figs.,  1901. 
Describes  occurrence  and  crystallographic  characters  of  the  minerals. 
