INDEX. 
-A-  Page. 
Abatagomaw,  Lake,  rocks  of. 530, 534 
Abbott,  C.  E.,on  Ely  trough 252,397 
Abitibi,  Lake,  rocks  near 422, 431 
Abitibi  River,  rocks  near 428, 540, 541 
Abramsschist,characteranddistribution of.  872-373 
correlation  of 872 
Absaroka  Range,  rocks  of 45, 843-844, 847 
Acadian  rocks,  character  and  distribution  of. .      692 
Acapulco,  rocks  near 756, 760, 763-765 
Acatlan,  rocks  of 767 
Acworth  gneiss,  character  and  distribution  of.      699 
Adams,  C.  B.,  on  Vermont 559-560, 593 
Adams,  F.  D.,  on  anorthosite 458,459-460, 482 
on  Grenville  series 475-476, 483, 621 
on  TTaliburton-Bancroft  area 472, 483 
on  Laurentian  of  Canada 461-463, 482 
on  Montreal  region 464-466, 470-471, 482, 483 
on  Norian  rocks 82-83, 105 
on  St.  Lawrence  River  region 463-464, 
467-468, 482, 483 
on  Thousand  Islands 468, 483 
work  of 15 
Adams,  F.  D.,  and  Barlow,  A.  E.,  on  Lauren- 
tian of  Ontario. ....  469-470, 474-475, 483 
Adams,  F.  D.,  and  others,  on  Adirondacks 
correlation 617-619, 650 
on  Lake  Superior  correlation..  173-174,251,293, 
294-295, 324-327, 390-391, 429-430,  446 
Adams  Lake,  rocks  at 876-877 
Adams  Lake  group,  character  and  distribu- 
tion of 46, 876, 879 
correlation  of 402, 862, 864, 876, 878-879 
Adirondacks,  correlation  in 43 
iron  in 603, 606, 619 
pre-Cambrian  rocks  of 16-17, 43, 94, 597-621 
literature  of 597-619 
Agamok  Lake,  rocks  near 311 
Agassiz,  Alexander,  on  Torch  Lake  geology  120, 388 
Agassiz,  Louis,  on  position  and  form  of  Lake 
Superior 298-299,401 
Agawa  formation, character  and  distribution 
of 248 
correlation  of 328-329 
Agnes  Lake,  rocks  of 275 
Agnotozoic,  proposed  use  of...  20,21,62,87,314,315 
subdivision  of 87 
Agogcbic,  Lake,  rocks  near 305, 308, 364 
Agreement,  existence  of 12 
Aguacate  River,  rocks  in 754 
Aguilera,  J.  C,  on  Mexico  geology.  754-755,757,891 
Aikin.E.  A.,  on  Maryland  rocks 664,712 
Ajibik  quartzite,  character  and  distribution 
of 1 56- 1 57, 328, 336 
correlation  of 169, 173, 195, 328-329, 719 
unconformity  beneath 353 
Page. 
Akeley  Lake,  rocks  near 212, 221-222, 237, 249 
Akeley  Lake  series,  character  and  distribution 
of 237 
Akerley,  Samuel,  on  southeast  New  York 
geology 622, 650 
Alabama,  pre-Cambrian  rocks  of. .  691-693, 700-701 
pre-Cambrian  rocks  of,  literature  of 691-693 
Alamos,  rocks  near 762 
Alaska,  pre-Cambrian  rocks  of 882-891 
Alaska  Range,  rocks  of 890 
Albany  conglomerate,  correlation  of 125 
Albany  granite,  character  and  distribution 
of. 555,556,559 
correlation  of 587 
Albany  River,  rocks  near 260, 542 
Alberta,  rocks  of 858-859 
Alexander,  J.  H.,and  Ducatel,  J.  T.,  on  Mary- 
land rocks 664, 712 
Alger,   F.,   and   Jackson,   C.    T.,  on   Nova 
Scotia 503-504, 522 
Algoma,  rocks  near 292, 413, 422, 425, 428 
Algonkian  continent,  peneplanation  of 37 
transgression  on 36-37 
Algonkian  period,  duration  of , 35 
folding  in 31-32 
life  in,  proof  of 33-34, 349 
Algonkian  system,  character  and  distribution 
of 21-22, 
243, 333-347, 584,  passim  682-698, 725, 
731,732,740,748,774,  passim  804-900 
correlation  of 40-47, 
361,362,519,536,706-710,833 
in  foreign  countries 49-58 
definition  of 32, 63 
deformation  in 35-36, 348-349 
extent  of 32-33 
fossils  in 33-35 
intrusive  rocks  of 28, 33 
metamorphism  of 35-36 
sedimentary  rocks  of 24, 40 
segregation  of '. 13, 19, 24  25 
subdivision  of 13, 20, 32-33, 155-156, 163,  1 70, 
323, 328,  335, 360-361,  443, 697, 60S,  77  !.  855 
stratigraphy  of 22 
topography  of 17 
unconformities  in 37-38 
unconformity  at  base  of 38-40 
use  of  term . . .  62-63, 98, 102-103, 104, 322  323,  361 
Allen  River,  rocks  on 888 
Allouez  conglomerate,  correlation  of 125 
Alluvial  series,  character  and  distribution  of.      622 
Alta,  rocks  near 7ss.  789 
Altar,  rocks  on 762 
A.ltyn  limestone,  character  and  distribution  of.      859 
correlation  of 881 
Amargosa  Range,  rocks  of 798,  v7n 
901 
