208  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Lakes  (Arthur) — Continued. 
56.  Geologizing  by  the  seaside.     Illustrations  of  geological  phenomena  related  to 
mining  as  shown  in  the  sea  cliffs  and  caves  at  La  Jolia,  near  San  Diego,  Cal. 
Mines  &  Minerals,  vol.  23,  pp.  543-545,  6  figs.,  1903. 
Describes  observations  upon  the  geology  and  geologic  phenomena  of  the  region. 
57.  The  sea  and  mining.     Illustrations  shown  at  seacoast  of  manner  of  making  and 
destruction  of  rocks  by  action  of  shellfish  and  erosion. 
Mines  &  Minerals,  vol.  24,  pp.  12-14,  figs.  1-6,  1903. 
Describes  erosion  and  sedimentation  processes  and  the  destructive  action  of  boring  seashells. 
58.  Mud  volcanoes.     Present-day  illustrations  of  mudflows  and  formations  resembling 
some  older  ones  in  which  mineral  deposits  have  been  found. 
Mines  &  Minerals,  vol.  24,  p.  33,  2  figs.,  1903. 
59.  Bonanzas  and  pockets  of  ore.     Some  of  the  causes  of  their  deposition  and  origin 
as  illustrated  in  various  mines. 
Mines  &  Minerals,  vol.  24,  pp.  52-53,  3  figs.,  1903. 
Describes  the  formation  of  ore  deposits. 
60.  Coal  and  asphalt  deposits  along  the  Moffat  railway.     Geological  conditions  shown 
which  promise  valuable  deposits  at  workable  depths. 
Mines  &  Minerals,  vol.  24,  pp.  134-136,  4  figs.,  1903. 
Describes  the  general  geology  and  the  occurrence  and  character  of  coal  and  asphalt  deposits. 
61.  Gypsum  deposits  in  Colorado. 
U.  S.  Geol.  Surv\.  Bull.  no.  223,  pp.  86-88,  2  figs.,  1904. 
Describes  character,  occurrence,  and  economic  development  of  the  gypsum  deposits  of  Colo- 
rado. 
62.  The  coal  fields  of  Colorado. 
Colo.  Sch.  Mines,  Bull.,  vol.  2,  no.  2,  pp.  11-23,  2  figs.,  1904. 
Describes  the  formation  of  the  coal,  the  location,  character,  and  geologic  age  of  the  coal  fields 
and  the  character  and  occurrence  of  the  coals. 
63.  Field  notes  concerning  ore  shoots  and  the  influence  of  downhill  pressure  on  the 
outcrop  of  veins. 
Mines  &  Minerals,  vol.  25,  pp.  92-93,  6  figs.,  1904. 
64.  Grand  Encampment  copper  district  of  Wyoming.     Some  notes  on  the  geology, 
and  a  description  of  some  of  the  development  work. 
Mines  <fc  Minerals,  vol.  25,  pp.  200-201,  2  figs.,  1904. 
65.  The  Yampa  coal  fields.     A  description  of  the  anthracite,  bituminous,  and  lignite 
field  traversed  by  the  Moffatt  Road  in  Routt  County,  Colorado. 
Mines  &  Minerals,  vol.  24,  pp.  249-251,  4  figs.,  1904. 
Describes  the  occurrence,  character,  and  geologic  relations  of  the  coal  beds. 
66.  The  Book  Cliff  coal  mines.     Coal  seams  near  Grand  Junction,  Colorado,  which 
exhibit  interesting  peculiarities  in  their  locations  and  formations. 
Mines  &  Minerals,  vol.  24,  pp.  289-291,  4  figs.,  1904. 
Describes  the  occurrence,  character,  geologic  relations,  and  economic  development  of  these 
coal  beds. 
67.  A  trip  through  Arizona.     Interesting  desert  scenery  and  the  relation  it  bears  to 
the  geology  and  mining  interests  of  the  region. 
Mines  &  Minerals,  vol.  24,  pp.  356-358,  4  figs.,  1904. 
Gives  observations  on  the  physiography  and  geology  of  parts  of  Arizona. 
68.  Tonopah  mining  camp.     Some  notes  on  its  location,  the  geological  formations  of 
the  region,  and  the  mines  in  operation. 
Mines  &  Minerals,  vol.  24,  pp.  479-481,  1904. 
69.  Mines  and  scenery.     A  typical  Nevada  mining  region  situated  in  the  bottom  of 
an  ancient  dried  up  lake  bed. 
Mines  &  Minerals,  vol.  24,  pp.  552-553,  3  figs.,  1904. 
Gives  observations  upon  the  physiography  and  geology  of  a  part  of  western  Nevada. 
