206  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Lakes  (Arthur) — Continued. 
25.  Geology  along  the  Animas  River,  with  descriptions  of  coal  and  metal   mines 
along  its  course,  including  a  sketch  of  the  Silver  Lake  mine  [Colorado]. 
Mines  &  Minerals,  vol.  22,  pp.  398-399,  3  figs.,  1902. 
Describes  the  character  and  occurrence  of  the  coal  and  associated  strata. 
26.  Natural  gas  in  Colorado,  a  description  of  some  of  its  occurrences  and  the  condi- 
tions which  point  to  the  probability  of  its  existence. 
Mines  &  Minerals,  vol.  22,  pp.  417-418,  2  figs.,  1902. 
27.  Prospecting  for  oil  in  the  region  of  the  cliff  dwellers  of  southeastern  Colorado. 
Mines  &  Minerals,  vol.  22,  pp.  438-440,  3  figs.,  1902. 
Describes  the  general  geology  and  structure  of  the  region. 
28.  The  Spanish  peaks.     Coal  region  in  southern  Colorado.     An  illustration  of  the 
effects  of  volcanic  action  on  coal  seams. 
Mines  &  Minerals,  vol.  22,  pp.  463-464,  4  figs.,  1902. 
Gives  a  summary  of  R.  C.  Hill's  description  of  the  region. 
29.  Crestone  mining  district  in  San  Luis  Park,  Colorado.     A  region  containing  some 
good  veins  favorably  situated  for  economical  mining. 
Mines  &  Minerals,  vol.  22,  pp.  467-468,  3  figs.,  1902. 
30.  Glacial  placer  beds  on  the  flanks  of  the  Mosquito  Range,  South  Park,  Colorado. 
Mines  &  Minerals,  vol.  22,  p.  469,  1  fig.,  1902. 
31.  Prospecting  for  coal  in  the  western  States — points  of  resemblance  and  points  of 
difference  between  the  western  and  eastern  coal  lields. 
Mines  &  Minerals,  vol.  22,  pp.  506-507,  2  figs.,  1902. 
32.  The  prairie  region  of  northeastern  Colorado.     A  description  of  some  interesting 
geological  occurrences  near  Sterling. 
Mines  &  Minerals,  vol.  22,  p.  510,  2  figs.,  1902. 
Describes  the  Tertiary  strata  of  the  region. 
33.  Faults  in  metal  mines.     The  different  types  and  their  various  manifestations, 
their  effects  upon  ore  deposition. 
Mines  &  Minerals,  vol.  22,  pp.  541-542,  6  figs.,  1902. 
34.  Volcanoes.     The  manner  of  their  eruption,  their  effect  upon  the  deposition  of 
minerals. 
Mines  &  Minerals,  vol.  22,  pp.  554-556,  4  figs.,  1902. 
35.  South  Park,  Colorado.     A  description  of  its  geology  and  economic  resources  in 
gold,  silver,  lead,  coal,  and  oil. 
Mines  &  Minerals,  vol.  23,  pp.  78-79,  1902. 
Describes  the  general  geology  of  the  region. 
36.  Prospecting  for  oil  in  Wyoming.     A  description  of  the  prospects  in  the  country 
around  Medicine  Butte,  and  Red  Mountain,  Uinta  County. 
Mines  &  Minerals,  vol.  23,  pp.  99-100,  2  figs.,  1902. 
Describes  the  Cretaceous  and  Tertiary  strata  of  the  region. 
37.  Great  Salt  Lake  basin.     A  description  of  the  terraces  which  show  the  shores  ol 
the  ancient  lake  when  it  was  much  larger  than  now. 
Mines  &  Minerals,  vol.  23,  pp.  112-113,  2  figs.,  1902. 
38.  Sketching  the  characteristic  features  of  rocks. 
Sci.  Am.  Suppl.,  vol.  74,  p.  22339,  1902. 
39.  Aguilar  coal  and  oil  district.     A  description  of  the  geology,  the  thickness  and 
quality  of  the  coal  veins,  and  the  indications  of  oil. 
Mines  &  Minerals,  vol.  23,  pp.  196-198,  4  figs.,  1903. 
40.  The  soils  of  Colorado  in  relation  to  their  geological  origin  and  surroundings,  and 
their  availability  for  irrigation. 
Mines  &  Minerals,  vol.  ^.3,  pp.  207-209,  1903. 
