INDEX. 
913 
Page. 
Geiger,  H.  R.,  and  Keith,  Arthur,  on  Harpers 
Ferry 675, 714 
Geikie,   Archibald,  on   Wasatch  Mountains 
rocks 786, 893 
Geological  Survey,  on   Lake  Superior  stra- 
tigraphy    374-376 
Geologic  publications,  summaries  of,  defects 
of 11-12 
summaries  of,  method  of  presental  ion  of. .        11 
Geologic  subdivision,  difficulties  of 24-25, 34 
Geologic  terms,  significance  of 12-13 
Geologic  work,  dates  of 13-14 
progress  of 34 
unreliability  of  some 13 
George,  Lake,  rocks  near 597 
( George  Island,  rocks  of 422 
George  River  limestone,  character  and  distri- 
bution of 507-508, 513 
Georgetown  quadrangle,  rocks  of..  809-811,827-828 
Georgia,  pre-Cambrian  rocks  of . . . .  689-691, 699-700 
pre-Cambrian  rocks  of,  literature  of 689-691 
Georgia  group,  correlation  of 562, 565 
relations  of 373 
Georgian  Bay,  rocks  near 324, 
405-406, 408,  417-418, 419, 420-422, 449-450, 457 
Gerlach,  — ,  on  Alpine  rocks 88 
Germany,  pre-Cambrian  rocks  of 54 
Gesner,  Abraham,  on  New  Brunswick  geol- 
ogy   490, 520 
Giants  range,  origin  of 221 
rocks  of 201, 
204, 205, 208, 225, 228, 234, 237, 238, 243-246, 339 
Giants  range  granite,  character  and  distribu- 
tion of 351 
relations  of 366 
Gibbs,  George,  on  Washington  rocks 865, 898 
Gibson,  T.  W.,  on  Ontario  geology.  279,399,420,445 
Gibsons  Mountain,  rocks  of 457 
Gilbert,  <;.  K.,  on  Arizona  rocks 771-772,892 
on  California  rocks 870, 891 
on  Colorado  rocks 813, 894 
on  Nevada  rocks 791-792,892 
on  New  Mexico  rocks 768, 891 
Gilpin,  Edward,  on  Cape  Breton 508,523 
Girault ,  — ,  on  Mexican  rocks 765 
Glamorgan  rocks  near 472-473, 475 
Glauconite,  development  of 227 
Glenn.  J.  W.,  on  Texas  rocks 744, 753 
Glenwood,  rocks  near 807 
Globe  district,  rocks  in 45,163 
Gneissoid  structure,  origin  of 81 
Gobbemichigomog  Lake,  rocks  near 205, 
206,212,236,237 
Gods  Lake,  rocks  on 532 
Goetz  Lake,  rocks  near 290 
Gogebic,  bake,  rocks  near 124-125,143 
Gogebic  district,  faulting  in 348 
rocksof 135,146,149, 
162, 173-174, 351, 352, 355, 358, 384,  38  i 
Seeateo  Penokee-Gogebic  district. 
Gogebic  range,  ores  of 204, 322 
rocks  of 138 
See  also  Penokee-Gogebic. 
Gogebic  series,  age  of 137 
correlal ion  of 207 
iron  ores  of 220 
55721— Null.  360—09 58 
Page. 
Gogebic  series,  relations  of 308-309 
Gogogashugun  River,  rocks  on 184 
Gold-bearing  series,  age  of 512 
character  and  distribution  of 506,509-512 
relations  of 512, 514 
Golden  Gate,  rocks  at 868 
Golden  Lake,  rocks  near 527 
Goldenville  formation,  character  and  distri- 
bution of 511 
Goodrich  quartzite,  character  and  distribu- 
tion of 158, 336 
correlation  of 328-329 
relations  of 352 
Gordon,  W.  C,  and  Lane,  A.  ('.,  on  Black 
River  section 177-178, 391 
Gore  Island,  rocks  of 536 
Gosiute  range,  rocks  of 795 
Goulais  Bay,  rocks  near 258,273,285,411 
Goulais  River,  rocks  on '      263 
Gouverneur,  rocks  of 601-603 
Granby,  rocks  at 561, 563 
Grand  Canyon  district,  fossils  in 94, 99 
Grand  Canyon  district,  rocks  in 45, 
46, 94, 308, 771-779, 807, 865 
unconformity  in 38, 39 
Grand  Canyon  group,  character  and  distribu- 
tion of 45, 771-779 
correlation  of 45, 743, 778 
subdivision  of 774 
Grand  Island,  rocks  of 300 
Grand  Manan,  rocks  of 493, 499-500 
Grand  Portage,  rocks  at 199, 200, 239 
Grand  Portage  Bay,  rocks  of 198,241,306-307 
Grand  Portage  Island,  rocks  on 278 
Grand  Rapids,  rocks  near 193,298, 724 
Grand  River,  rocks  on 807, 818-819, 829 
Grands  Sables,  Point  des,  rocks  of 300, 408 
Granite,  age  of 74, 126,207 
character  and  distribution  of 73-74,207 
groups  of 73-74 
intrusion  of 75, 76-77, 133-135 
minerals  of 75 
origin  of 240 
Granite,  Cape,  rocks  of 529 
Granite  Falls,  rocks  of 197 
Granite  group,  description  of 130 
Granite  Point,  rocks  of 118,225, 298, 363 
Granite  Rock,  rocks  of 792 
Graniteville,  rocks  of 739 
Grant,  U.  S.,  on  Grand  Portage  Island 278,399 
on  Gunflint  Lake 221-222,395 
on  Kekequabic  Lake 216,217,395 
onKeweenawanof  Douglas  County.  192-193, 392 
on  Lake  Superior  stral  igraphy 375 
on  Mesabi  range 234-235, 396 
on  Minnesota  geology 209, 
213,217-218,394,395 
Graphite,  occurrence  and  charact  er  of. .  66, 100,453 
Grassy  Lake,  rocks  at 826 
Gralon,  L.  ('..  on  Glamorgan  area.    ...  472-473,483 
on  Mississaga  R  iver 428, 644 
Graton,  L.  C,  and  Lindgren,  W.,  on  Appa- 
lachian gold  and  tin 683-684,715 
on  New  Mexico  rocks 770,891 
Gray,  A.  15.,  on  bake  Superior  mineral  re- 
gions    298, 401 
