926 
INDEX. 
Page. 
North,  Cape,  rocks  of 504 
Northampton,  rocks  at 561 
North  Bay,  rocks  of 541 
North  Bluff,  rocks  near 723-724 
Northbridge  gneiss,  character  and  distribu- 
tion of 43,592 
North  Carolina,  pre-Carabrian  rocks  of 677- 
685, 695-698 
pre-Cambrian  rocks  of,  literature  of 677-685 
North  Channel,  rocks  near 403-404, 407 
North  Devon  Island,  rocks  of 529 
Northern  complex,  character  and  distribution 
of 155, 170 
subdivision  of 155 
Northfield,  rocks  at 563-564 
North  Mound,  rocks  near 194 
North  Mountain,  rocks  of 571 
Northport,  rocks  near 866 
North  Somerset  Island,  rocks  of 529 
Norton,  W.  H.,  on  Iowa  rocks 725, 750 
Norway,  rocks  of 172, 470 
Norway  limestone,  character  and  distribution 
of 133 
Norwood,  J.  G.,  on  Minnesota  geology 196, 
392-393 
on  St.  Louis  and  Wisconsinfivers'  rocks.  196,392 
Norwood,  J.  G.,  and  Broadhead,  G.  C,  on 
Nevada  rocks 736, 752 
Notre  Dame  Mountains,  rocks  of 484 
Nottamasagami  Lake,  rocks  of '. 271 
Not  t  away  River,  rocks  of 543-544 
Nova  Scotia,  correlation  in 43 
gold  in 506, 509-512 
nomenclature  in 100 
pre-Cambrian  rocks  of 43, 97, 503-514, 585 
literature  of 503-511 
Numakagon  River,  rocks  on 188 
Oaxaca,  rocks  of 754-755, 756, 760, 763, 765-768 
Observatory  Hill,  rocks  at 722-723 
Ocoee  group,  character  and  distribution  of. . .      44, 
682, 685-687, 690, 692, 698, 699, 700, 708 
correlation  of 41, 44, 102, 685, 699, 700, 701 
fossils  in 709 
relations  of 19, 36, 708 
Ocoee  River,  rocks  on 686 
Ogden,  rocks  near 783, 784 
Ogdensburg,  rocks  at 640 
Ogishke  conglomerate,  character  and  distri- 
bution of 201, 202, 205, 221, 248 
correlation  of 137, 
206, 207, 212-213, 325, 328-329, 358 
relations  of 355, 373, 374 
Ogishki  Manissi  Lake,  rocks  at 199, 
200, 203, 211-212, 232, 237, 273, 316 
Okanogan  River,  rocks  near 865, 867 
Oklahoma,  correlation  in 44 
pre-Cambrian  rocks  in 44, 741-742 
literature  of 741-742 
Old  Red  sandstone,  character  and  distribu- 
tion of 253, 254, 568 
Olenellus  beds,  character  and  distribution  of.      94- 
95,499,518,791,798 
fossils  of 34, 95, 787, 800 
geologic  position  of 16, 
34, 36, 63, 94, 318, 499, 787, 791 
Page. 
Olmsted,  Denison,  on  North  Carolina  geol- 
ogy  677, 714 
Ombe  Range,  rocks  of 794-795 
Omenica  River,  rocks  on 877-878 
Onaping  Lake,  rocks  near. .  416, 425-426, 428, 439-440 
Onaping  River,  rocks  near 416, 425-426, 428-429 
Onaping  tuff,  character  and  distribution  of. .      432 
Ono,  rocks  near 873 
Ontarian  system,  character  and  distribution 
of 219, 270, 276-277 
correlation  of 317 
subdivision  of 276, 319, 323 
use  of  term 371 
Ontario,  correlation  in 317 
gold  of 279,280-281 
iron  of 292,426,432-133 
See a/.vo  Mattawan;  Atikokan;  Steep 
Rock    Lake;  Michipicoten;  Animikie. 
nickel  of 425-427, 430-431 
pre-Cambrian  rocks  of 253-298, 329 
literature  on 253-298 
Ontonagon  River,  rocks  near 112-113, 
116,125,304,305 
Onwatin  slate,  character  and  distribution  of.      432 
Opazatica  Lake,  rocks  near 432 
Oquirrh  Mountains,  rocks  of 789 
Ordonez,  Ezequiel,  on  Mexican  geology 755-768 
work  of 15 
Oregon,  correlation  in 46 
pre-Cambrian  rocks  of 46, 851, 867, 874 
Organ  Mountains,  rocks  of 744 
Original  Huronian.    See  Huronian. 
Original  Huronian  district,  location  of 435 
rocks  of 325,435-437 
Original  Laurentian  district,  location  of 476 
nomenclature  in 478-479 
rocks  of 476-479 
See  also  Quebec. 
Oronto  River,  rocks  near 349 
Orthoceratite,  occurrence  of 119 
Osann,  A.,  on  Original  Laurentian 472,483 
on  Texas  rocks 746, 753 
Osborne,  Cape,  rocks  of 529 
Oslinca  River,  rocks  near 878 
Osoyoos,  Lake,  rocks  near 867 
Oswegatchie  series,  character  and  distribu- 
tion of 606, 608-609, 610, 612 
correlation  of 610, 612, 621 
Ottawa  Canal,  rocks  along 466-467 
Ottawa  gneiss,  character  and  distribution  of.     460, 
476^77 
correlation  of 233, 317, 459, 476, 479 
segregation  of 87, 97 
Ottawa  River,  rocks  near 83, 
403, 417, 448, 449, 452, 466-467, 472, 618 
Otter  Tail  quartzite,  character  and  distribu- 
tion of 410 
correlation  of 409 
Ouray,  rocks  near 820-821, 823, 832 
Ouray,  Mount,  rocks  of 816 
Outer  conglomerate,  character  and  distribu- 
tion of 346 
Ovens  Bluffs,  rocks  in., 506 
Owen,  D.D.,  on  Chippewaland  district.  178-179,391 
on  formation  of  Lake  Superior 178, 391 
