894  PRE-CAMBBIAN    GEOLOGY   OF    NORTH   AMERICA. 
58  A  geologic  reconnaissance  in  southwestern  Nevada  and  eastern  California, 
by  Sydney  H.  Ball.    Bull.  U.  S.  Geol.  Survey  No.  308,  1907,  pp.  218. 
59  From  manuscript  of  professional  paper  on  the  geological  map  of  North 
America,  by  Bailey  Willis.     In  preparation. 
60  Account  of  an  expedition  from  Pittsburg  to  the  Rocky  Mountains,  performed 
in  the  years  1819  and  1820,  by  order  of  the  Hon.  J.  C.  Calhoun,  Secretary  of 
War,  by  Maj.  Stephen  H.  Long.  Philadelphia,  1823,  2  vols.,  with  an  atlas,  pp. 
503,  442,  xcviii. 
01  Geological  report,  by  F.  V.  Hayden.  Third  Ann.  Kept.  U.  S.  Geol.  Survey 
Terr.,  embracing  Colorado  and  New  Mexico,  1869,  pp.  109-199. 
02  Report  on  the  geology  of  the  region  traversed  by  the  northern  or  Middle 
Park  division  during  the  working  season  of  1873,  by  Arch.  R.  Marvine.  Seventh 
Ann.  Rept.  U.  S.  Geol.  and  Geog.  Survey  Terr.,  1874,  pp.  83-192,  with  atlas 
sheets. 
63  Report  on  the  South  Park  district  during  the  season  of  1873,  by  A.  C.  Peale. 
Idem,  pp.  193-273.  with  atlas  sheets. 
64  Report  of  F.  M.  Endlich.     Idem,  pp.  275-361,  with  atlas  sheets. 
65  Report  on  the  geology  of  a  portion  of  Colorado  examined  in  1873,  by  John  J. 
Stevenson.  Rept.  Geog.  and  Geol.  Surveys  W.  100th  Mer.,  vol.  3,  Geology,  1875, 
pp.  303-501,  with  atlas  sheets. 
66  Orographic  movements  in  the  Rocky  Mountains,  by  S.  F.  Emmons.  Bull. 
Geol.  Soc.  America,  vol.  1,  1890,  pp.  245-286. 
67  Based  on  unpublished  field  notes  made  by  Prof.  Arthur  Lakes  in  the  summer 
of  1890. 
68  Description  of  the  Pikes  Peak  sheet,  by  Whitman  Cross.  Geologic  Atlas 
U.  S.,  folio  7,  U.  S.  Geol.  Survey,  1894. 
69  General  geology  of  the  Cripple  Creek  district,  Colorado,  by  Whitman  Cross. 
Sixteenth  Ann.  Rept.  U.  S.  Geol.  Survey,  pt.  2,  1895,  pp.  13-109. 
70  Geology  of  the  Denver  Basin  in  Colorado,  by  S.  F.  Emmons,  Whitman  Cross, 
and  G.  H.  Eldridge.     Mon.  U.  S.  Geol.  Survey,  vol.  27,  1896,  pp.  556,  with  maps. 
71  Archean-Cambrian  contact  near  Manitou,  Colo.,  by  W.  O.  Crosby.  Bull.  Geol. 
Soc.  America,  vol.  10,  1899,  pp.  141-164. 
72  The  granite  rocks  of  the  Pikes  Peak  quadrangle,  by  E.  B.  Mathews.  Jour. 
Geology,  vol.  8,  1900,  pp.  214-240. 
73  From  manuscript  notes  by  C.  R.  Van  Hise,  1901. 
74  From  manuscript  notes  by  W.  N.  Smith,  1901. 
75  Preliminary  manuscript  prepared  for  present  bulletin  by  S.  H.  Ball  and 
J.  E.  Spurr,  1905.  See  also  Preliminary  report  on  ore  deposits  in  the  George- 
town, Colo.,  mining  district,  by  J.  E.  Spurr  and  G.  H.  Garry.  Bull.  U.  S.  Geol. 
Survey  No.  260,  1905,  pp.  99-120.  Pre-Cambrian  rocks  of  the  Georgetown  quad- 
rangle, Colorado,  by  S.  H.  Ball.  Am.  Jour.  Sci.,  4th  ser.,  vol.  21,  1906,  pp. 
371-3S9. 
76  Geology  of  the  Boulder  district,  Colorado,  by  N.  M.  Fenneman.  Bull.  TJ.  S. 
Geol.  Survey  No.  265,  1905,  pp.  101,  with  geologic  map. 
77  Preliminary  report  on  the  geology  and  underground  water  resources  of  the 
central  Great  Plains,  by  N.  H.  Darton.  Prof.  Paper  TJ.  S.  Geol.  Survey  No.  32, 
1905,  pp.  433. 
78  Geology  and  gold  deposits  of  the  Cripple  Creek  district,  Colorado,  by 
Waldemar  Lindgren  and  F.  L.  Ransome.  Prof.  Paper  U.  S.  Geol.  Survey  No. 
54.  1906,  pp.  516. 
79  Report  on  the  geology  of  that  part  of  northwestern  New  Mexico  examined 
during  the  field  season  of  1874,  by  E.  D.  Cope.  Rept.  Chief  of  Engs.  for  1875, 
Appendix  LL,  pt.  2,  pp.  921-110S. 
