INDEX. 



527 



Flint, described. 228-230, 231. 233. 



(See ('hr)t.-) 

 Foliation of schist, 103, 114, 117, 125, 308. 4*2. 

 Fiiol-Kiill iilirnn ore, 370-271 , 274, 276, 277. 

 Foster rel'erreil to, 6, 10. 14, 15-17, .SO, 71. 

 Fraj:meiital and nonfragmental rocks, gradations hetween. 



2on. 24R. 

 Frasmental rock, greenstone cou;;lomerate grades into. 3"!)- 



380. 

 relations to granite, 30,"^.. 



fi. 



G.lbbro. 07. 10.5. 111.113, 115-116. 261, 262, 268, 348, .^51 , .358. 410, 

 425, 435. 458, 466. 

 grades into diabase, 348. 3.50, 358. 410. 

 of Kewei'nawan. 3f, 37. 38, 80, 1211, 349. 

 relations to Irooi-bearing member. 185. 

 relations to slates, 36. 

 Garnet, analysis of, 214. 



of actinolitic slate, 195, 213, 214. 

 of mica-scbist. 119. 

 ofTTpper slate. 214. 

 Geikie. detinition of graywacke, 306. 

 Geodes in lerrnginoiis ebert. 205. 

 Germania mine. 102, 228. . 

 Geyseritc, oriiiin of. 251. 



Gneiss, 2, fi, 20, 36, 37. 47, 52. 80. 81. 103. 107-111. 116-122. 123. 139, 

 388, 428. 434. 435, 442. 443, 449, 452, 462, 465, 467, 471, 473. 

 described, 107-11 1, 116-122. 

 foliation of, 117. 



grades into granite. 107, 123-124, 125. 

 origin of, 122, 12.5-126. 

 relations to t'lierty limestone, 446. 

 relations to Eastern sandstojie, 389. 

 relations to grayvvacke, US. 

 relations to tlreenstone.i-onglomerate. 420.421. 

 relations tti Iron-bearin^ member. 185. 

 relations to njii a sibist. 85. 308. 

 relations to Qnartz slate. lOH, 143. 171. 

 <Se6 niotitr-giieUx. i'hlorite-qnriss, Epidotc-gneiss, 

 Granite. Hoftibleiidcgun'i. ychixt, Sencite-gneUn.) 

 Gneissoiil granite. (See (Inehs. (Irmiile.) 

 Gogebic lake. 2, 3, 4. 6. 10. 11. 12. 14. 1.5, 16-17.30, 31, 32. 60. 67, 



10.5. 187. 421, 434. 461. 463. 464. 466. 

 Gogogashngnn river. (.See J/oyi(rfai nicr. West hmiich.) 

 Goocb referred to, 250. 

 (^rand Portage bay, 262. 



Granite, 2, 6,15, 19, 20, 67. 68. 81. 103, 118, 11,5,146,344,388.394, 

 395, 428, 434. 435. 442. 443, 444, 149, 450, 451, 452, 453, 454, 

 457, 462. 465. 167, 469. 471. 473, 

 crystallization of. 113. 

 described. 106-107. 111-113. 122. 

 grades into gneiss. 107. 123-124. 125. 

 of Keweenaw series, 80. 

 of Menominee district. 34-36. 81. 



recom posed. 388. 391, 394. 395, 403,407, 435. 449, 451, 454. 462. 

 relations to fberty limestone. 127-128. 445. 

 relations ttf Eastern sandsloite. 389. 

 relations to (greenstone eonglonierale, 420. 421. 

 relations to Huronian. 34—36, 37-38. 

 relations to Iron-bearing nninber, 71-72, 185, 187, 189. 

 relations to Keweenaw .series. 13-11, 104. 

 relations to Penokee series, lii5. 



relati(ms to (Juartz-slate. 128, 1 I3. 171. 174, 179. 180. 445, 448. 

 relations to scbi.st. 104-105, 116-117, 134,442,44.5. 

 (See Giieiee. Micrograiiite.) 1 



Granite, unconformably below Animikie series. 261. 262. 

 Granite areas, relations of 105. 

 Granitoid.gneiss. (.See Giifiss. Gianite.) 

 (irapbitic material of iron carbonate, 190. 



Graywacke, 3, 261, 262, 301, 302, 303,304,344,391,433,465,472, 

 described, 161, 167-16S, 170, 306-307, 31,5-316, 317-318,319, 

 321, 322, 323, 325,320-327,3.28,329-330,330-3,31,332-338, 

 371, 396-397, 398, 401-402, 512, 514. 

 origin of. 77-78, 334-335. 

 relations to clay -slate, 305. 333. 

 relations to gneiss, 118. 

 relations to iron ore. 285. 

 relations to mica-schist. 307. 308. 309, 341. 

 relations to mica-slate. 307, 308, 309. 

 (.See G ratjwacke-datf.) 

 Gray wackeslate. 3. 303, 304, 3,32, 389, 391, 465, 469, 572, 



described, 159-160, 161, 165-166, 306-307, 318-319, 321,322, 



324, 325. 326, 329, 331, 397-399. 400, 401, 402-403, 404, 484. 

 relations to iron ore, 385. 

 (See Gmjwacke.) 

 Great Britain, chert of. 252. 

 Greenstone. (See Gabbro, £niptives,Greenstone-eonglomerate, 



DiatiaS'-.) 

 Greenstone couglonn'rate. 429, 430, 431. 432,434,436. 

 described, 374-377, 381-382. 383-387, 426, 518. 

 grades into fragmeutal rock, 379-380. 

 origin of, 377-381. 



relations to amygdaloids, 380, 418, 419. 

 relations to clay-sl;ite. 374. 375. 

 relations to diabase. 410. 

 relations to gneiss anil granite, 420. 421. 

 relations to.j.asper conglomerate. 369, 370. 

 rilations to Kcwecnawan. 119. 420, 43.5. 

 relalions to lior|>liyrite, 378, 416. 

 relations to .scliisi . 120, 421. 

 relations to slate. 419, 420. 

 relalions to .Southern Gmnplex. 419, 420. 435. 

 thickness of. 423-425. 

 Greenstone range, relations to Eastern area rocks. 422. 

 Greenstone-schist. 52. 71. 

 Griinerite. possible presence of. 215. 

 Giimbe! on scbalstein. 374. 

 < i unflint lake, 192, 248, 261, 262, 2(i8, 469. 470. 500. 506. 



H. 



Hague referred to. 251. 

 Hall rcfen'ed to. 7. 27. 

 Hematite. 280. 381.291. 



Jiescribed. 368. 



from iron carbonate, 199, 204, 205. 



of concretions. 2t/6. 



id' actini>litic slate. 195. 196, 197. 198, 210, 211. 215, 262. 



of diabase, 3,56. 



of ferruginous chert, 202, 303, 309, 354, 265. 



of ferruginous slate. 193. 202. 204. 



of iron carbonate, 190, 201. 



of (|uart/.ite, 369. 



of slate. 392. 



]isendnmorpiious. 265. 

 (Si-e Iron oxide.) 

 Hematil.' schist, 391. 

 Hillebraud. analy.ses by. 130-131, 191. 

 Hiudc. on origin of chert, 140,251,252. 

 Hobbs referred to, 41^ 

 Hornldemie, alteration nt'. 122. 



enlargement of, 86, 353, 411, 412, 



