INDEX. 



449 



Basic original rocks, Fine-grained, ashbed-diabase, 77-87. 



.diabaso-porphyritc, 77-87. 



, oliv initio diabase and mclaphyr, 68-77. 



, olivino-freo diabase, 61-68. 



in Ilaroiiian and Keweenawan, Similarity of, 402,403. 



, Material for study of, 36. 



, origin of, Views on, 11. 



, Pumpelly'a description of, 35. 



, Relation of, to acid rocks, 148, 432-436. 



, Kosenbuseb's classification 



, Thickness of beds of, 134, 141. 



Batchewanung Bay, Course of Keweenaw Series at, 349. 



, Hnronian of, 400. 



, Keweenawan rocks of, 348. 



Battle Islands, Courso of Keweenaw Series at, 334. 



, Sandstono of, 336. 



Bayfield, H. W., 5. 



— , Paper by, 1 1. 



Bead Island, Qnartz-porpbyry of, 103, ill, 346. 



, Quartzless porphyry of, 95, 304 



Beaver Bay ami vicinity, Anorthito-rock of, 61, 310, 4:19, 440. 



, Ashbccl -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. 



, Oli vine-diabase of, 308. 



, Quartz-porphyry of, 99, 100, 103, 107, 108, 306, 307. 



Beaver Bay, Islands in, Anorthite-rock of, 307. 

 Beaver Bay Group, 29S-323. 



, Acid and basic eruptives of, 433, 436. 



, Anortbite-rock of, 01, 308, 310. 



at Beaver Bay, 107, 108, 30 1-309. 



Beaver River, 306-308. 



, Characteristics of, 207, 298, 299. 



, Diabase-porpbyrite of, 83, 84, 308, 440, 442. 



, Dikes of, 320, 322, 323. 



, Felsite of, 108, 109, 110, 310, 311, 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-porpbyrite of, 83, 308. 



, Gabbro of, 306, 308. 



, Orthoclase-free gabbro of, 48, 49, 306. 



Bell, R., on Aniinikie Group, age of, 385. 



, crowning overflow, 382. 



, at Gunflint Lake, 382. 



, stratigraphy of, 380. 



— on Hnronian 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. 



29 L s 



under Bay schists. 396. 



sandstones, 1 57, 332. 



BoteGrlHO Bay, Auglte-syenlteof, 117. 



, Eastern Sandstone on, 185. 353, 362, 363. 



Olivinc-diabaso of, 72, 74, 1 84. 



, Median Valley rocks on, 179. 



ml Bay, Dikes of, 371. 



, Dike-rock from, 372. 



i.J.,5. 

 — . Publications of, 11,17. 



— on Rainy Lake schists, 397. 



\ Iteration-product of olivino, 38. 



— of granite, 125, 



orthoclase-free gabbro, 48. 



ortho 



Black Bay, Dikes near, 333. 



, Dip of strata i 



, Lake Superior synclinal on, 414. 



, Lower Division on, 160. 



, Porphyry <■ 



.Sandstone" 



, Relation of sandstones and diabases near, 334. 



Black and Nipigon bays, 331-338. 



, Amygdaloids of 



, Detrital rocks ol 



, Diabases ol 



, Relation of rocks of, to Ki weenaw Point rocks, 336, 



337. 



. See Nipigon Bay, Bun I 



Black Point. See Caribou point. 



Black River (Mich), Lower Division on, 208. 



, Shales of Porcupine Monn tains on, 225. 



, (Wis.), Rocks of, 251-254,441. 



Black Sturgeon Lake, Sandstone, &c, of, 340. 



Black Sturgeon River, Contact of sandstone and gabbro on, 



333. 

 Bladder Lake, Contact of gabbro and Huronian on, 232. 



. olivine-diabase of, 38. 



Blake, W. P., Paper by, 18. 



Bohemian Mountain. SeeMt. Bohemia and Bohemian Rango. 



Bohemian Range, 179-180. 



, Angite-syenite of, 115, 116, 117, 145, 184. 



, "Cblorites"of = diabaseamygdaloids,285. 



. conglomerates of, Source of, 186. 



, Diabases of, 183. 



, Diabase-porpbyrite of, 81. 



, Felsite of, 104, 182, 183. 



, Foster and Whitney on, 180. 



, Bunt on, 180. 



, Jackson on, 180. 



, Kinds of rock of, 181. 



, Localities on, 181. 



, Lac la Bello to Delaware mine, 183, 184. 



] Mt. Bohemia, 181, 184, 185, 435. 



, Mt. Honghton, 181, 182, 433. 



, Orthoclase-gabbro of, 53. 



i ilivine-free diabase of, 67. 



. Relation-to Keweenaw Series, 181. 



. Summary on, 186, 187. 



, Thickness of beds of, 187. 



, Whittlesev on, 180. 



, See Bare Hills, Lao la Belle, Mt Bohemia, Mt Hongh- 

 ton. 



Brick Island, 309. 



Brooks, T. B., 5. 



— on gneiss and schist, intcrbedded, 400. 



