588 



INDEX. 



Edwards mine, cross section of ore bodies at, figure ol'. 96 



Eisenglimmer 475 



Eklogite 70, 74 



Ely shaft 540,541 



Enlargement of fcldnpar grains 290, 301-303 



of quartz grains 100,104, 



264, 290, 292. 300, 304, 308, 318, 379, 414, 422, 439, 448, 449, 453 



Epidiabase 572 



Epidiorite 494, 496, 500 



in Northern Complex 151, 158, 178, 180-181 



origin of 181 



Epidioritic varieties of Mona schists 158 



Epidote of acid dikes 182 



of acid schists 160 



of biotite-granite 172, 173 



of greenstone 493, 496, 506 



of greenstone-schist 205 



of Kitchi schist 164, 166 



ofmica-gneisa 416 



of mica-schist 416,443 



of Mona schist 155.156,157,158,159 



of quartz-schist 416,443 



ofquartzite 437,438,444 



of so hist- eon glomerate 442 



Erie mine 439,440,441,537 



Erosion. (See Denudation.) 



Eruptives, altered 152 



associated with Azoic rocks 26 



Huronian 93 



identified by Credner 46 



in conglomerate 557 



in Menominee district 576 



in Republic formation 138 



metasomatic changes in 102 



{See Diabase, Diorite, Granite, Peridotite, Green- 

 stone.) 



Escanaba River 22,30,384 



Eureka mine 85. 187 



Excelsior mine 378,425 



Explorations in Marquette district 5-148 



Fan fold of Alps 3^,5 



of ferruginous schist, figure of £ 



False bedding 5 



Fault-overthrust in Siamo slate, plate of 5 



Fault-slipping 3 



Faulting 293, 306, 307, 313, 322, 328, 344, 570-5 



in conglomerate 4 



in ferruginous chert a 



in Ishpeming formation 4 



in jaapilite 371. 3 



in Negauuee formation 378, 379, 3 



in Republic trough 144, 541-5 



Felch Mountain trough 5 



series, lower 5 



Feldspar, alteration of. {Sec Alteration of feldspar.) 



including magnetite 4 



of biotite-schist 196, 197, 198. 1 



of Clarksburg tuffs 4 



of conglomerate 276, 301, 413, 432, 442, 443, 477. 535, 5 



of ferruginous rock 4 



of granite 2 



of greenstone-schist 204, 2 



of gray wacke 265. 448, 4 



of hematite ore 3 



Page. 



Feldspar of Kitchi schists 163, 165 



of mica-gneiss 447, 450, 459, 574 



of mica-schist 320, 443, 574 



of novaculite 267 



of quartzite 236, 290, 4 15, 435 



of recomposed ore 438 



of siderito-slate 367 



of slate 292, 318. 448 



parallel arrangement of grains 228 



(Sec Albite, MicrocUne, Orthoclase, Plagioclase.) 



Feldspathic biotite-schist 196-198 



Feldspathic micaceous- schist, analyses of 202, 203 



Felsite l'J9 



Felsite-porphyry, origin of 103 



Fence River 576 



Fence River voleanics 579 



Ferrite. (See Hematite, Iron oxide, Limonite, Mag- 

 netite.) 



Ferruginous carbonate in Kitchi schist 166 



in Republic formation 1^9 



(S^eSiderite.) 



Ferruginous chert 324, 326. 



327, 336, 365, 366, 372, 378, 379, 381, 382 



brecciation of 361 



cavities in 370 



concretionary structure in 370 



described 361-362, 370-371 



from cherty aiderite 337, 451 



from siderite 451 



from eiderite-slato 446, 454 



in Northern Complex 186,187 



passing into ferruginous slate 380 



passing into jaspilite 372 



plate of 346 



Ferruginous quartzite 427 



Ferruginous schist 67, 526 



alteration of 107 



composition of 107 



fan fold in, plate of 570 



formation of ores by decomposition of 75 



origin of 106-109 



Ferruginous slate 371, 381, 427, 564, 565-566 



alteration of 380 



described 361, 369-370 



from cherty siderite 337 



from ferruginous chert 380 



from siderite-slate 361.446 



in Northern Complex 186,187 



minor plications in, figure of 332 



plato of 344 



Ferruginous veins in Northern Complex 186-188 



Fissility in conglomerate 442 



in Michigamme formation 452 



in slate 269.319,324 



in quartz-schist 293 



relations to bedding ". 452 



Fitch mine 125,129,384.410,430,432 



Flag ore, interstratified with chlorite-schist 92,515 



Flagstone in arenaceous slate group 92 



Flowage, zone of. (See Zone of flowage.) 



Folded ferruginous chert of Starwest mine, figure of. 334 



Folding, effect on metamorphism 573-575 



isoclinal. (See Isoclinal folding.) 



Marquette type of 3-4 



of Ajibik quartzite 285, 286, 301, 308 



of Bij iki schist 417, 424 



