532 



INDEX. 



Quartzite relations to shafts, 277. 279. 

 Quurt7.-lJori>liyr> . 4tJ2. 

 Quart zni<lc,2S)ll. 



iluscribed, 133, 135, 130. 



recompo.sc(l, in quartz-slate, 172. 



rel.atiofis to quartzite, 245. 

 Quartz-snhist, descril)e(], 216, 217, 218-219, 220-223. 223-224, 239. 

 Quartz slate, 3, 4, 92, 1« 181, 180, 209, 285, 297, 363, 368, 369, 428- 

 430,4.32,433,435.436,438-410, 44:1-444, 459-409, 467, 468, 

 469, 471, 472, 474, 482, 484, 4,S6, 488. 



basal euuglomerate in, 139, 172, 173, 174, 180, 181. 



flexures of, 437, 438. 



uf Eastern area. 366, 308-371. 



recouiposed quartz-rock in, 172. 



relations to ebert J limestone, 130, 134, 139, 141, 142. 143.144, 

 147,171.180,181,443,454,464. 



relations to jineiss, 143, 171. 



relations to granite, 128, 143, 171, 174, 179, 180, 445, 448. 



relations to iron-bearing member, 144, 175, 176 181, 184-185, 

 188, 189, 200, 294. 299. 363, 455, 450, 464. 



relations to iron ore. 185, 19.1, 26.1. 270. 286, 287. 294, 295. 



relations to schist, 129, 143, 171, 173, 178, 445, 446-449. 



relations to Southern Complex. 143, 171, 172-174, 179-180, 

 181, 444-454. 



relations to Upi)er slate, 296. 297. 



thickness of. 143, 144, 146, 180, 444. 



topography of, 145, 188-189. 301. 

 Quaternary. 48. 



E. 

 Randall, referred to. 7. 17. 

 Riggs referred to. 191, 192. 

 Rohrbach referred to. 413. 

 Rominger referred to, 5. 10, 67-73, 78. 

 Roscoe referred to, 259, 289. 

 Roth referred to, 255. 



S. 

 St. Louis district. 1, 472. 

 Sandstone. 147. 148, 149, 2.50, 4.50-457. 462, 463, 404. 



described, 154-155, 103, 165, 167, 486. 



relations to iron ore, 285. 

 Schalstein. Giiuibel on. 374. 



Schist. 2, 20, 80, 81, 94, 103, 104-105, 107-111, 116-122, 125, 428, 435, 

 438, 440, 442, 443, 450, 45 1 , 452-4.53, 454, 462, 469, 471, 473. 



of Iron-bearing nienilier. described, 217, 244-245. 



of Quartz-slate. des{;ribe4l, 106. 



of Southern comph-x, described, 107-111. 116-122. 



of l'pi>er slale. describeil, 316-317, 397. 404. 



foliation of, 103, 114. 117. 125. 308. 442. 



origin of. 124, 125-126. 



relations to chcrty limestone. 127-128,446. 



relatiims to granite, 104-105, 116-117, 123-124, 442, 445. 



relations to greenstone-conglomerate, 420, 421. 



relations to quartz-slate. 129, 143, 171, 173, 178, 445, 446-149. 



relations to syenite;, 445. 



uuconformably below Animikie series, 261, 262. 



tiiee Aclintttilicschist, Jliotit<'-schist, G-neiss. (rteenutvite- 

 schisl, IJtnn\hlnult; ncfiist, Mica-schifit, Syenitc-schUt. ) 

 Schistose rocks, Whittlesey on, 20. 

 Si'borleuinier referred to. 259, 289. 

 Sericite from feldsl>ar, 118,333,334. 



of cliert, 133. 



of cla.y -slate. 305. 



ofgnci.ss. 109. 111,110,118. 



of graywackt, 307, 333, 334. 



of mica-schist, 307, 308. 



of loica-Blate, 307, 308. 



Sericite of Quartz-slate. 148, 151. 370. 



Sericite-gueiss, 110. 



.Sericite-sohist. described. 324, 406-407. 



foliatiiui of. 428. 

 Sericite-slate. 391. 



described, 404, 405-100. 

 Serpentine of diab.ase, 356. 



Shafts in Peuokee-Gogebic range, relations of, 277, 279, 

 Shale, 148, 177, 178- 



describi'd, 187, 486. 

 (See (Jtaii shale, Clay slate, Slate.) 

 Sideritc, alteration of, 201, 202, 253, 283, 302. 



described. 227, 228-230, 234, 240-242. 367-368. 



grades into ferruginous slate. 201-202. 



of actinolitic slate, 258, 266, 267, 362, 364. 



of clay -slate, 434, 



of ferruginous chert, 258, 205. 



of gray wacke, 333. 



of iron carbonate, 200, 201, 258, 263, 204, 208, 294. 



of elate, 392. 



of veins, 202. 



position of, 199. 



relations to actinolite, 433. 



relations to iron ore, 282. 



relations to niagiietite, 433. 

 (See Iron carbonate.) 

 Sideritic chert, described, 490, 498, 500. 



slate, described, 490. 

 Silica, concentration of, 255. 



deposition of, 284, 28.8-290, 292, 293. 



of actinolitic slate. 198, 211, 212. 257. 258, 259, 266, 267, 294, 



of chert breccia, 395. 



of concretions, 207, 208. 



of ferruginous eliert. 202, 203, 205, 212, 254, 255, 256, 257. 



of ferruginous slate. 192, 193, 194, 202, 203, 204, 253. 



of geyserite. 251. 



of iron carbonate, 190 199, 200, 202, 256, 263, 264, 294. 



of jasi)er conglomerate, 370. 



of quartzite. 396. 



of slate. 392. 



relations to iron ore. 282, 284. 



solubility of, 256, 288, 289, 290, 292, 293. 

 ,Silurian. Irving on, 86. 

 Silver creek area. 42. 

 riiouxdistrict. 2, 472. 



Slate, 7, 15, 52, 67, 80, 143, 145, 147, 148. 156, 15^, 245, 250, 261, 262, 

 363, 364, 368, 369, 370. 376, 431, 438-440, 449. f 



described, 154-155, 159, 101, 164, 165, 107, 168, 17u 171. 29:1. 

 313-315. 360. 373, 381, 382, 401-402, 402-404, 405 400, 484. 



dip of, 390. 



relations to chcrty limestone, 128, 134, i:{9, 44.'). 



relations ti> gabbro, 36. 



relations to gr.niiite and schist, 128-129. 



relations to greenstone-conglomerate, 419, 420. 



relations to iron ore, 282, 283. 



relatiousto shafts. 279. 



(Sec Actinolitic slate. Biotitf .slate. Chlorite slate, (.'tay- 

 slate. Clay-shale. FerrU(iiiious .\tate. Oraynackc-slate, 

 Mat/nctite-slate. Mica-slate, t/itart^-slate, tihale. Upper 

 slate.) 

 Smaragditc t'vnm augite, 41.'i. 417. 



frcnu diallage, 353. 



from fehlspar. 353. 413. 414, 415, 417. 418. 



of.liabasc,359, 412. 



of poridi_\rite, 415. 417. 



relations to allgito. 413. 435. 

 Soapstonc lr<iuL iliabase, 294. 355. 356, 357, 359. 



