902 
INDEX. 
Page. 
American  Fork,  rocks  on 788 
Ami,  H.  M.,  on  geology  of  eastern  Canada. . .  101, 106 
Aminicon,  rocks  near 301, 304 
Ammonoosuc  district,  rocks  of 556 
Androscoggin  River,  rocks  on 553, 590 
Angikuni  Lake,  rocks  on 540 
Animas  River,  rocks  on 819, 821, 826, 829-832 
Animikie  revolution,  period  of 318 
Animikie  series,  age  of 239, 266 
character  and  distribution  of. . .  63, 199-226, 231- 
234, 238-239, 244, 248-249, 261-272, 278, 285, 288, 
291-293,  306,  310-311, 313, 334,  341, 351, 426, 545 
Animikie,  copper  in 91 
correlation  of 91, 98, 
102, 137, 144, 200, 204, 207-208, 212-213, 225, 
236, 306, 310, 314, 321, 322-325, 328-329, 339, 
350,  357-358,  382-384,  439,  441-442,  538,  547 
definition  of 380 
dikes  in 302-303 
faulting  in 348 
fossils  in 100, 270 
intrusives  in 3S2 
iron  in 201, 225-227, 292, 296 
relations  of 101, 287, 352-353, 366, 368-376, 432 
segregation  of 60, 91, 94 
subdivision  of 225, 235, 244, 319,  432 
unconformity  at  base  of 38, 352-353, 382-384 
Ann  River,  rocks  on 213 
Annsville,  rocks  at 628, 638 
Anorthosite  group,  character  and  distribution 
of 215-216,  280,  470-471 ,  478 
correlation  of 216, 224 
igneous  nature  of 97 
intrusions  in 76 
origin  of 92 
use  of  term 59 
Anse-au-Loup,  rocks  near 536 
Antelope  Island  Mountains,  rocks  in 46, 789, 790 
Antietam  sandstone,  correlation  of 671 
Antisell,  Thomas,  on  Coast  Range 868, 899 
Antoine,  Lake,  rocks  near 171 
Antoine  dolomite,  correlation  of 169 
Antwerp,  rocks  near 608 
Apache  Mountains,  rocks  of 746, 772 
Appalachians,  correlation  in 44, 704-706 
gold  and  tin 683-684 
pre-Cambrian  rocks  of 653-711 
literature  of 653-711 
unconformity  in 39 
See  also  particular  States;  Piedmont  Pla- 
teau. 
Appekunny  argillite,  character  and  distribu- 
tion of 859 
Aquarius  Mountains,  rocks  of 868, 871 
Aquidneck,  rocks  at 583 
Aqui  Mountains,  rocks  of 789,  795 
Arbuckle  Mountains,  rocks  of 738, 741-742 
Archseozoie,  proposed  use  of 20 
Archeeozoic  time,  conditions  in 95 
Archean  continent,  location  of 16, 819 
peneplanation  of 38-39,  463 
Archean  system,  character  and  distribution 
of 21-22, 26, 32, 72-75, 78, 147, 164, 
183-184,  214-215,  219,  244-248,  275, 
331-335,  459,  passim  534-544,  559,  578, 
627,  639,  659,  673-675,  passim 
691-700,     passim     721-735,     755-800 
Page. 
Archean  system,  correlation  of 44-47, 
211, 321, 538,  passim  706-800 
correlation  of,  in  foreign  lands . . .  49-58, 232-233 
definition  of 26, 63, 86, 378-379 
fossils  in 639 
granites  of 73-78, 241, 248, 250-251 
graphite  in 639 
greenstones  in 228 
igneous  intrusions  in 22, 
28, 29-30,  74, 231-232, 381-382 
life  in,  evidence  of.    See  Life. 
origin  of 29-32 
sedimentary  rocks  in 23-24, 30,  <0, 58, 63 
segregation  of 13, 19, 24-25 
structure  of 347-348 
subdivision  of.  20,  26-29,  72,  78-79,  81-82,  85,  92, 
100, 146, 149, 170, 219, 236, 246, 250, 275, 276, 
278,  289,  308-309,  319, 323,  328, 361,  443,  459, 
496,  604, 638,  682-683, 690,  697-698,  728,  744 
topography  of 22 
unconformity  at  top  of 38-40,  72 
use  of  term : 61, 63, 104, 276, 361, 627 
See  also  Fundamental  complex;  Base- 
ment complex;  Azoic  system;  Pre- 
Cambrian,  etc. 
Archeozoon,  affinities  of 91 
Arenaceous  slate  group,  description  of 132, 134 
Arenicolites  spiralis,  origin  of 80 
Arizona,  correlation  in 45 
pre-Cambrian  rocks  of 45, 771-779, 867-874 
literature  of 771-777, 867-874 
Arizonan  formation,  character  and  distribu- 
tion of . 776 
Arkansas  River,  rocks  on  and  near 804, 
808, 815-818 
Arlington,  rocks  at 573 
Arpin,  rocks  near 194 
Arvonian  rocks,  character  of 82, 88 
correlation  of 88 
definition  of 82, 88 
deformation  in 102 
segregation  of 88 
use  of  term 62 
Ascutney,  rocks  at 561, 563, 564 
Ascutney  series,  character  and   distribution 
of 568 
Asheville,  rocks  near 682-683, 693, 698 
Ashland,  rocks  near 349 
Ash  ton  schist,  rocks  of 580 
Aspen,  rocks  near 816, 817 
Aspidella,  origin  of 80 
Astral  time,  conditions  in 95 
Athabasca  Lake,  rocks  near 528, 
536, 538-539, 544, 547 
Athabasca  sandstone,  character  and  distribu- 
tion of 547 
correlation  of 539, 547 
relations  of 540 
Athens,  rocks  near 686 
Athol  granite,  character  and  distribution  of. .      578 
Atikokan  district,  iron  of 291-292 
rocks  of 341 
Atikokan  range,  rocks  of : 335 
Atikokan  River,  rocks  on 274 
Atikokan  series,  character  and  distribution 
of 274,277 
Atlantic  coast,  pre-Cambrian  rocks  of 16-18 
