FOR    THE    YEARS    1901-1905,    INCLUSIVE.  79 
Crosby  (William  O.)  and  Loug-hlin  (G.  F.). 
1.  A  descriptive  catalogue  of  the  building  stones  of  Boston  and  vicinity. 
Tech.  Quart.,  vol.  17,  pp.  165-185,  1904. 
Describes  the  geologic  and  geographic  occurrence,  character,  and  use  in  Boston  of  various 
building  stones. 
Cross  (Charles  Mortimer). 
1 .  The  underground  water  circulation. 
Ores  and  Metals,  vol.  13,  no.  15,  pp.  21,  37-38;  no.  16,  p.  22,  1904. 
Discusses  ore  deposition  by  circulating  waters. 
Cross  (Whitman). 
1.  ( Hitline  of  geology.     (Silverton  quadrangle,  Colorado. ) 
U.  S.  Geol.  Surv.,  Bull.  no.  182,  pp.  29-39,  1901. 
Describes  the  general  characteristics  of  the  sedimentary  and  igneous  rocks  and  the  structure 
of  the  region. 
2.  Geologic  formations  versus  lithologic  individuals. 
Jour.  Geol.,  vol.  10,  pp.  223-244,  1902. 
Reviews  papers  by  Willis  and  Eckel  and  discusses  geological  formations  as  divisions  of  rock 
masses  which  should  be  discriminated  through  the  consideration  of  all  the  geologic  data 
which  each  contains. 
3.  The  development  of  systematic  petrography  in  the  nineteenth  century. 
Jour.  Geol.,  vol.  10,  pp.  332-376,  451-499,  1902. 
Reviews  the  development  of  the  science  of  petrography  and  givqs  the  author's  summary  ol 
some  of  the  defects  of  the  modern  classifications  of  igneous  rocks  and  of  the  status  of 
systematic  petrography  at  the  close  of  the  nineteenth  century. 
4.  Observations  on  Hawaiian  geology. 
Abstract:  Science,  new  ser.,  vol.  17,  p.  740,  1903. 
5.  A  new  Devonian  formation  in  Colorado. 
Am.  Jour.  ScL,  4th  ser.,  vol.  18,  pp.  24.5-252,  1904. 
Describes  character,  occurrence,  and  geologic  relations  of  Devonian  strata  in  the  San  Juan 
region  of  Colorado. 
6.  An  occurrence  of  trachyte  on  the  Island  of  Hawaii. 
Jour.  Geol.,  vol.  12,  pp.  510-523,  1  fig.,  1904. 
Describes  the  occurence  and  character  of  a  trachyte  rock  from  the  Island  of  Hawaii,  gives 
chemical  analyses  of  this  and  allied  rocks  and  its  norm,  and  discusses  its  bearing  upon  the 
geologic  history  of  the  island,  and  the  general  significance  of  the  occurrence. 
7.  Geography  and  general  geology  of  the  Rico  quadrangle  [Colorado]. 
U.  S.  Geol.  Surv.,  Geol.  Atlas  of  IT.  S.,  folio  no.  130,  1905. 
Describes  the  physiographic  features,  the  occurrence,  character,  and  relations  of  metamor 
phic  and  igneous  rocks  and  of  Algonkian,  Cambrian,  Devono-Carboniferous,  Jurassic,  and 
Cretaceous  strata,  and  the  geologic  structure  and  history  of  the  area. 
Cross  (Whitman)  and  Howe  (Ernest). 
1.  Silverirn  folio,  Colorada.     Geography  and  general  geology  of  the  quadrangle. 
U.  S.  Geol.  Surv.,  Geol.  Atlas  of  the  U.  S.,  folio  no.  120,  1905. 
Gives  an  outline  sketch  of  the  physical  history  and  general  geology,  describes  the  occurrence, 
character,  and  relations  of  Archean,  Algonkian,  Cambrian,  Devonian,  Carboniferous,  and 
Tertiary  rocks,  of  Quaternary  deposits,  and  of  eruptive  rocks,  and  the  physiography  and 
geologic  history  and  structure,  and  discusses  in  detail  the  petrology  of  the  quadrangle. 
2.  Red  Beds  of  southwestern  Colorado  and  their  correlation. 
Geol.  Soc.  Am.,  Bull.,  vol.  16,  pp.  447-498,  4  pis.  and  4  figs.,  1905. 
Discusses  the  occurrence,  character,  and  relations  of  strata,  collectively  called  Red  Beds,  in 
southwestern  Colorado,  their  subdivisions  and  correlation  with  Red  Beds  elsewhere. 
3.  Topography  and  general  geology  of  the  Needle  Mountains  quadrangle  [Colorado]. 
U.  S.  Geol.  Surv.,  Geol.  Atlas  of  U.  S.,  folio  no.  131,  1905. 
Describes  the  physiographic  features,  the  occurrence,  character,  and  relations  of  metamorphic 
and  igneous  rocks  and  of  Algonkian,  Cambrian,  Devonian,  Carboniferous,  and  Tertiary 
strata,  and  the  geologic  structure  and  history  of  the  area. 
4.  The  Red  Beds  of  southwestern  Colorado. 
Abstract:  Science,  new  ser.,  vol.  21,  p.  349,  1905. 
