524 



indkx. 



Aujiite of diabasp, 350. 354. 356, 358. 410^11, 412, 435. 



of gabbro, 115. 



of greeustoue-<'ouglonierate. 375, 377. 



relations to siuaragdite, 413, 435. 

 Augite-porphyri'ti', desrribed, 414-419. 



of Kewii-uawiiii, 34it. 



relations to diabase, 415. 



relatioDS to greenstoue-congluiuerate, 416. 

 Aurora mine, 94, 101, 102, 144, 146, 154, 163, 174, 281, 357, 448. 

 Axels island, chert of, 251, 252. 

 Azoic 8lat«s, Wbitney on, 13. 

 Azoic system, 73-75. 



B. 



Bad river, 36. 1U7, 108, 129. 138. 139, 176. 183. 185, 188. 3Ul, 3U2^ 



303, 304, 309, 343, 344, 438, 440. 

 Bad river area. 7. 8. 9, 10, 17-19, 22, 28, 30, 33, 34-36, 37, 38, 39-40. 



42, 48, 67, 84, 104, 107-108, 144, 145. 146. 

 Baraboo district, 1, 473. 

 Barnes referred to, 5, 6, 13, 14, 15. 

 Basal conglomerate. (See Conglomerate, basal.) 

 Base level, 452. 454, 

 Basement complex, 428, 438, 455. 471, 472. 



relations to Hurouiau, 81-82. 86. 



relations to Keweenawan, 470. 

 (See Southern Complex and Laurentlan.) 

 Bayley referred to, 214. 

 Beaver bay, 81. 

 Beck*! referred to, 86, 411, 412. 

 Bedding, 26, 95, 296. 

 Bessemer, 200, 

 Biotite from actinolite, 210. 



from anipbibole, 354. 



from aiigite, 414. 417. 



from diallage, 115. 



from feldspar. 118. 125, 180, 305, 333, 334. 335, 336.337,338. 

 339, 342, 343, 353, 413, 414. 



from pyroxene, 115. 



of aetinolitic slate, 195, 210, 213. 



of biotite-scUist, 336, 339. 340, 341. 



of biotite-slate, 338, 339. 



of chert-conglomerate, 451. 



of clay -slate. 305. 



ofdiabase, 351, 359. 



of gneiss, 108, 116, 118, 119, 120. 



of granite. 106, 107, 112, 1 13. 



of gray wacke, 304, 333, 334, 335, 336, 337. 



of hornblende-gneiss. 110-111. 



ofmica-scbist. 307, 308,309. 



of mica-slate, 307, 308, 3U9, 342, 343. 



ofQnartz-slate,148,152. 



of syenite, 114, 115. 



of syeuite-acliist, 125. 



of Upper slate, 303. 



relations to hornblende, 119. 



relations to magnetite, 354. 



relations to plagioclase, 354. 

 Biotite-gneiss, 108, 116, 476, 478. 

 Biotite-gray wacke, described, 323,324-325. 

 liiotite-schist,309. 



analysis of, 336. 



described. 310-311. 318, 320-321, 339-341. 516. 



origin of, 339-341. 

 (See Mica-schivt.) 

 Biotite-slate, descrilied, 309, 310. 311. 312, 3i;i. 315,319-320, 321, 

 322-324, 326, 338-339, 486, 514, 516. 



Biotite-slate. orij^in of, 338-33fl. 



(See Mica-slate.) 

 Bii-kinbine referred to, 87-92,92-96,280. 

 Black river, 81, 165, 179, 187, 233. 297. 298, 299, 304, 330, 456. 

 Black river area, 37-38. 



east braueh. 145, 



west branch, 145. 189. 

 Black river district, Wiscnusin, 1, 472, 473. 

 Bladder lake, 129. 

 Blue Jacket mine, 164. 

 Bouney mine, 269. 

 Bradley referred to. 41. 

 Brainerd referred to, 247. 

 Breccia. (See Chert -breccia.) 

 Brecciatiou of aetinolitic slate. 266. 



of ferruginous chert, 194. 207, 209, 254, 264. 265. 



of iron carbonate. 263. 264. 



of limestone, 207. 

 Brouzite ofdiabase, 354. 

 Brooks referred to, 7, 8, 15, 30-31,31-32,33,34-38.44,47.56,66, 



78, 79, 81, 463. 

 Brotherton mine, 269. 

 Brotberton referred to, 9, 84. 

 Brule mountain 81. 



C. 



Calcite amygdules, 377, 418. 



of chlorite rock. 111. 



ofgnei.ss, 109,118. 



of gi-ay wacke, 307, 333, 336. 



of limestone, 131. 



of porphyrite, 418. 

 Cambrian, Irving on, 86. 87. 

 Canada, 2, 261. 472. 

 Carbonaceous material, 190, 193, 200, 203, 250, 307, 308, 333, 337, 



343. 

 Carbonate. (See Iron- carbonate.) 

 Carboniferous. 140. 247, 250. 2.52. 

 Carries creek, 170. 

 Chalcedony amygdules, 418. 

 Chalcedony of aetinolitic slate, 2U. 



(»f ferruginous chert, 192, 194, 203. 



uf veins, 202. 



orgiu of. 252. 

 Chaudierliu referred to, 8, 9-10, 43-44, 59-66, 463. 

 Cliauuing, iudebtedness to, xiv. 



referred to, 12. 270, 271, 279, 441. 

 Chatard, analy.sis by, 351, 357. 



referred to, 191. 192, 214. 

 Chert, 32, 363. 379, 392. 423, 471 . 



described, 132-134, 136-138, 225, 226, 227, 228,230,238,239, 

 240, 241, 243. 244, 367, 368, 399, 400, 403, 480. 482. 506. 



cliaracter of, 132-134. 



of lime3tx>ue, 139-140, 205. 



of aetinolitic slate, 266. 



of clay-slate, 434. 



of conglomerate, 174, 180, 448. 



of ferruginous chert, 205, 209. 



of iron carbonate, 190, 200, 201. 254, 262. 263, 264. 



of iron ore. 283. 



of quartzite, 395. 



of veins, 202. 



..rigin of 140-141, 142, 248, 249, 250, 251, 252, 253. 



relations to liuiestone. 127-128, 132, 139, 141. 



reUitions to Quart/, slate, 171, 172. 



replaced by iron oxide, 283. 



