582 



INDEX. 



Page. 



Alteration of siderite 280, 



340. 342, 354, 367, 368, 405, 419, 422, 423, 451 , 455, 562-563 



of aiderite-alate 367,446,454 



of sideritic chert 371 



of uralitic diabase 496 



products in Palmer gneiss 217 



{.See Weathering, Metamorphisui.) 



Altered diabaae 218, 490 



altered erupt i ves 152, 159, 176 



altered feldspathic biotite-scbist 199.200 



altered feldspatbic quartzite 512 



altered hornblende 172 



altered orthoclaso 172 



altered plagioclase 157, ] 59, 172, 204, 508 



altered tuffs 153. 201, 502 



Alps, fan fold of 3^,568 



Aluminous silicates in iron ore 91 



Amphibole, alcration of 388 



analysis of, referred to 140 



cellular structure of 206, 470, 471, 504 



plate of . . .' 470 



contact structure of, in greenstone schists 206 



contact structure of. in Republic greenstone, 



plate of 470 



of Mona schist 157 



of Clarksburg sediments 470, 472 



of greenstone. . . 178, 465, 466, 467, 486, 498, 501, 502, 503-504 



of greenstone-schist 204-205 



of griinerite-magnetite-schist 391, 418 



of hornblende-schist 476 



of iron formation 382 



of jaspilite 388, 389 



of quartzite 438 



{See Actinolite, Griinerite, Hornblende, Uralite.) 



Amphibole-scbist 152, 158, 159 



distinguished from greenstone-scbiat 206 



in Southern Complex 204, 206-208 



origin of 37 



(See Actinolite-acbists, Anthophyllite-schist, 

 Griinerite-magnetite-schist, Hornblende- 

 schists.) 



Ampbibolite 1 58, 472, 495, 527 



origin of 140 



Amygdaloidal sheet greenstone 515. 516-517 



Amygdaloid 312 



in Ajibik quartzite 284 



in lower Marquette series 578,579 



in Siamo slate 562 



in Clarksburg rocks 467,484 



Analysis of amphibole, referred to 140 



of Bijiki schist 418 



of carbonaceous slate 446 



of cherty siderite 337 



of chloritoid, referred to 140 



of clay, referred to 140 



of diorite 495 



of feldspathic micaceous schist 202,203 



of granite, referred to 62 



of granitite 202 



of green schist 168 



of greenstone 495 



of grunerite-magnetite- schist 338 



of iron ore, referred to 21,110.129 



of jaspilite 363 



of Kitchi schist 168 



of micaceous schist 202 



Page, 



Analysis of sericite- schist ig8 



of serpentine 184 



of slate 202 



of peridotite 186 



of Palmer gneiss 217 



Andalusite 436 



of Marquette formations 574 



of mica-schist 447.449 



Angeline Lake. (See Lake Angeline.) 



Animikie district 370 



rocks 118 



series 368 



ores and jaspers of 102-103 



transgression 577 



Antbophyllite-acbist 50, 129, 416 



Aphanitic Mona schists 154 



{See Mona schists, dense varieties of.) 



Aplitein Northern Complex 151, 153,182 



Appalachians, Paleozoic shales of 566 



Archean 109, 



112. 123, 129, 134. 143, 146, 222, 231. 237, 238, 

 256. 259, 264, 277, 278, 280, 283, 284, 287, 289. 

 205, 300, 360, 412, 432, 439, 525, 534, 569, 577 

 and Ajibik quartzite, apparent gradation be- 

 tween 295-297, 298, 315 



and Ishpeming formation, apparent gradation 



between 441 



and Lower Marquette, apparent gradation be- 

 tween 559 



and Mesnard quartzite, apparent gradation be- 

 tween 231,232,237 



denudation of 230, 537, 555 



described 149-220, 526-528, 555-556 



formations in the northwestern United States. . . 101-104 



island 150, 



220. 221, 222, 241, 257, 258. 269, 270, 

 275, 276, 282, 285, 286, 557, 568, 569 



of Republic area, described 526-528 



relations to Ajibik, quartzite 295, 



296, 297. 298. 300, 301. 302, 309, 310. 313 



relations to Ishpeming formation 413. 441, 442, 536 



relations to Lower Marquette series 298.532-535,557 



relation to Mesnard quartzite 297, 557 



relation to Republic tongue 525-528 



relations to "Wewe slate 270 



series, divisibility of 98, 104-106, 110-112 



separation of Huronian from 145-146 



use of name 134 



{See Basement Complex, Laurentian, Northern 

 Complex, Southern Complex.) 



Arenaceous slate group 91-92.148 



Argillaceous slate 20 



Argillite 50,58.117,118 



associated with diorite-schist 86 



Arkose 129 



Ashes, volcanic ''8. 139, 169 



{See Tuffs.) 



Augen of feldspar in granite 270 



Augen-gneiss 301 



Augite of diabase 148. 179, 180 



of diorite 178 



of epidiorite 180 



of greenstone 491, 492, 493, 494, 495, 498 



of quartz-diabase 519, 520 



Augite-porphyrite 498 



Avonian series 129 



