150  BIBLIOGRAPHY    OF    NORTH    AMERICAN    GEOLOGY 
Hall  (Charles  M.),  Todd  (J.  E.)  and— Continued. 
2.  Geology  and  water  resources  of  part  of  the  lower  James  River  Valley,  South 
Dakota. 
See  Todd  (James  E.)  and  HaU  (C.  M.),  2. 
3.  De  Smet  folio,  South  Dakota. 
See  Todd  (James  E.)  and  Hall  (CM.),  3. 
Hall  (Christopher  Webber). 
1.  Exploration  for  gold  in  the  central  States. 
Lake  Superior  Mg.  Inst.,  Proc.,  pp.  49-60  [1898?]. 
Discusses  occurrences  of  gold. 
2.  Sources  of  the  constituents  of  Minnesota  soils. 
Minn.  Acad.  Nat.  Sci.,  Bull.  no.  3,  pp.  388-406,  2  figs.,  1901. 
3.  Keweenawan  area  of  eastern  Minnesota. 
Geol.  Soc.  Am.,  Bull.,  vol.  12,  pp.  313-342,  2  pis.,  3  figs,  1901. 
Describes  the  topography  and  physiography,  relations,  associated  formations,  the  occurrence 
of  the  Keweenawan  rocks,  and  the  general  characters  and  petrography  of  the  Chengwatana 
series. 
4.  Keewatin  area  of  eastern  and  central  Minnesota. 
Geol.  Soc.  Am.,  Bull.,  vol.  12,  pp.  343-376,  4  pis.,  1901. 
Describes  the  occurrence  of  the  series  at  various  localities  and  their  megascopic  and  micro- 
scopic characters.    Discusses  the  evidences  as  to  the  age  of  the  series. 
5.  The  geology  of  Minnesota. 
Int.  Mg.  Cong.,  4th  session,  Proc,  pp.  165-171,  1901. 
Describes  the  geologic  formations  of  the  State  and  the  occurrence  of  economic  minerals  in 
each  of  them. 
6.  The  geography  and  geology  of  Minnesota. 
Minneapolis,  The  H.  W.  Wilson  Company,  1903.    xii,  299  pp.,  5  pis.,  163  figs. 
7.  The  geology  of  Minnesota.     A  description  of  the  various  formations  in  the  State, 
and  an  account  of  their  products  which  are  of  economic  value. 
Mines  and  Minerals,  vol.  23,  pp.  532-534,  1903. 
Describes  the  distribution,  lithology,  and  economic  products  of  the  several  geologic  systems 
present  in  the  State. 
8.  Notes  on  the  wells,  springs,  and  general  water  resources  of  Minnesota. 
IT.  S.  Geol.  Surv.,  Water-Supply  and  Irrigation  Paper  no.  102,  pp.  441-488,  1904. 
9.  Underground  waters  of  eastern  United  States:  Minnesota. 
U.  S.  Geol.  Surv.,  Water-Supply  and  Irrigation  Paper  no.  114,  pp.  226-232,  1905. 
Describes  the  occurrence,  character,  and  water  resources  of  water-bearding  strata  underlying 
the  State. 
10.  The  structure,  lithology,  and  genesis  of  the  magnesian  series  of  the  northwestern 
States.     [Abstract.] 
Minn.  Acad.  Nat.  Sci.,  Bull.,  vol.  4,  no.  1,  pt.  2,  pp.  119-123,  1905. 
Discusses  the  nomenclature  of  the  Magnesian  series  in  Minnesota  and  Wisconsin. 
Hallock  (William). 
1.  Peculiar  effects  due  to  a  lightning  discharge  on  Lake  Champlain  in  August,  1900. 
Jour.  Geol.,  vol.  9,  pp.  671-672,  1901. 
Describes  the  effect  upon  the  rocks  struck  by  the  discharge. 
2.  An  ascent  of  Mt.  Whitney,  California,  with  notes  on  the  geology. 
Abstract:  Science,  new  ser.,  vol.  17,  p.  505,  1903. 
Halse  (Edward). 
1.  Some  silver- bearing  veins  of  Mexico. 
North  of  Eng.  Inst,  of  Mg.  &  Mech.  Engrs.,  Trans.,  vol.  50,  pp.  202-217,  1901. 
Contains  brief  notes  on  the  vein  systems  of  various  mines. 
2.  Notes  on  the  structure  of  ore-bearing  veins  in  Mexico. 
Am.  Inst.  Mg.  Engrs.,  Trans.,  vol.  32,  pp.  285-302,  26  figs.,  1902. 
