INDEX. 
Basic original rocks, Fine-grained, ashbed-diabase, 77-87. 
—— —-—,diabase-porphyrite, 77-87. 
————, olivinitic diabase and melaphyr, 68-77. 
—— — —, olivine-free diabase, 61-68. 
——— in Huronian and Keweenawan, Similarity of, 402,403. 
——-, Material for study of, 36. 
— ——, origin of, Views on, 11. 
———, Pumpelly’s description of, 35. 
— ——, Relation of, to acid rocks, 148, 432-436. 
——-—, Rosenbusch’s classification of, 35. 
——-—, Thickness of beds of, 134, 141. 
Batchewanung Bay, Course of Keweenaw Series at, 349. 
——, Huronian of, 400. 
——, Keweenawan rocks of, 348. 
Battle Islands, Course of Keweenaw Series at, 334. 
——, Sandstone of, 336. 
Bayfield, H. W., 5. 
—, Paper by, 14. 
Bead Island, Quartz-porphyry of, 103, 111, 346. 
——, Quartzless porphyry of, 95, 304 
Beaver Bay and vicinity, Anorthite-rock of, 61, 310, 439, 440. 
——-—, Ashbed-diabase of, 84, 305, 308. 
——~—, Dike of, 307, 436. 
———, Gabbros of, 42, 43, 48, 49, 305, 306, 309. 
——-—, Granite of, 304, 306. 
———, Granitic porphyry of, 122, 306. 
——-—, Magnetite of, 51. 
——-—, Olivine-diabase of, 308. 
———, Quartz-porphyry of, 99, 100, 103, 107, 108, 306, 307. 
Beaver Bay, Islands in, Anorthite-rock of, 307. 
Beaver Bay Group, 295-323. 
——-—, Acid and basic eruptives of, 433, 436. 
——-—, Anorthite-rock of, 61, 308, 310. 
——W— at Beaver Bay, 107, 108, 304-309. 
—— —— Beaver River, 306-308. 
——-—, Characteristics of, 207, 298, 299. 
——-, Diabase-porphyrite of, 83, 84, 308, 440, 442. 
———, Dikes of, 320, 322, 323. 
— ——, Felsite of, 108, 109, 110, 310, 31 1, 320-322. 
———, at Grand Marais, 319, 320. 
———, Granite of, 304. 
——-—, at Great Palisades, 109, 314-318, 434, 435, 440. 
——~—, Limits of, 298. 
———, Quartz-porphyry of, 107, 108, 314-318, 440. 
——— at Red Rock Bay, 110, 322. 
———— Split Rock River, 107, 299-303. 
——-—, Thickness of, 299. 
——— at T. 56, R.7 W., 108, 310, 311. 
Beaver River, Anorthite-rock of, 60, 306. 
—-—, Diabase-porphyrite of, 83, 308. 
——, Gabbro of, 306, 308. 
——, Orthoclase-free gabbro of, 48, 49, 306. 
Bell, R., on Animikie Group, age of, 385. 
———~, crowning overflow, 382. 
———-—, at Gunflint Lake, 382. 
———-, stratigraphy of, 380. 
—on Huronian Rocks of Pic River, 401, 402. 
—— Kaministiquia slates, 374. 
—— Keweenaw Series, age of, 12. 
—— Nipigon Lake Basin, 27, 408. 
—, Publications by, 21, 22. 
—on Pigeon River dikes, 370, 371. 
— — Rainy Lake schists, 397. 
—, Referred to, 5, 6, 10, 400. 
— on Saganaga Lake schists, 397. 
—on schists, age of, 395. 
29LS 
. 
449 
Bell on Thunder Bay schista, 396. 
———— sandstones, 157, 332, 
Béte Grise Bay, Augite-syenite of, 117. 
———, Eastern Sandstone on, 185, 353, 362, 363. 
— —— Olivine-diabase of, 72,74, 184. 
——-—, Median Valley rocks on, 179. 
Big Trout Bay, Dikes of, 371. 
——-—, Dike-rock from, 372. 
Bigsby, J.J., 5. 
—, Publications of, 14, 17. 
—on Rainy Lake schists, 397. 
Biotite, Alteration-product of olivine, 38. 
— of granite, 125. 
— — orthoclase-free gabbro, 43. 
—— orthoclase-gabbro, 52. 
Black Bay, Dikes near, 333. 
—_—, Dip of strata on, 333. 
—-—, Lake Superior synclinal on, 414. 
——, Lower Division on, 160. 
—-—, Porphyry of, 337. 
——, Sandstone of, 24, 128, 156, 336, 337. 
——, Relation of sandstones and diabases near, 334. 
Black and Nipigon bays, 331-338. 
——-—, Amygdaloids of, 334. 
——-, Detrital rocks of, 336. 
——~-—, Diabases of, 334-336. 
——-—, Relation of rocks of, to Keweenaw Point rocks, 336, 
837. 
———. See Nipigon Bay, Black Bay. 
Black Point. See Caribou Point. 
Black River (Mich.), Lower Division on, 208. 
——, Shales of Porcupine Mountains on, 225. 
——, (Wis.), Rocks of, 251-254, 441. 
Black Sturgeon Lake, Sandstone, &c., of, 340. 
Black Sturgeon River, Contact of sandstone and gabbro on, 
$33, 
Bladder Lake, Contact of gabbro and Huronian on, 232. 
—-—, Olivine-diabase of, 38. 
Blake, W. P., Paper by, 18. 
Bohemian Mountain. See Mt. Bohemia ond Bohemian Range. 
Bohemian Range, 179-186. 
——, Augite-syenite of, 115, 116, 117, 145, 184. 
—-—, ‘‘Chlorites” of = diabase-amygdaloids, 285. 
——, conglomerates of, Source of, 186. 
——, Diabases of, 183. 
——, Diabase-porphyrite of, 81. 
——, Felsite of, 104, 182, 183. 
—~—, Foster and Whitaey on, 180. 
——, Hunt on, 180. 
—-—, Jackson on, 180. 
——, Kinds of rock of, 181. 
—~—, Localities on, 181. 
—-—, Lac la Belle to Delaware mine, 183, 184. 
——, Mt. Bohemia, 181, 184, 185, 435. 
——, Mt. Honghton, 181, 182, 433. 
——, Orthoclase-gabbro of, 53. : 
— —, Olivine-free diabase of, 67. 
——, Relatiomto. Keweenaw Series, 181. 
——, Summary on, 186, 187. 
—-—, Thickness of beds of, 187. 
——, Whittlesey on, 180. 
—~—, See Bare Hills, Lac la Belle, Mt. Bohemia, Mt. Hough- 
ton. 
Brick Island, 369. 
Brooks, T. B., 5. 
—on gneiss and schist, interbedded, 400. 
