INDEX. 
—, Characteristics of, 125. 
Granite, Constituents of, augite, 125. 
——-—, feldspar, 125. 
———, hornblende, 125. 
——-—, quartz, 125. 
—of Duluth, 270-272, 435. 
—, Eruptive and non-eruptive, 395. 
—, Huronian, 389, 390. 
—, Inclusions in, 125. 
—of Kakabika Falls, 375. 
—at Lake Shebandowan, 396. 
—, Localities for, 125. 
—in Menominee Region, 394. 
——Mesabi Range, 383, 899. 
—north of Thunder Bay, 396. 
—, Relation of Animikie beds to, 399. 
—, Relations, 125. 
Granitell. See Augite-syenite and Porphyry, Granitic. 
Granitic porphyry. See Augite-syenite and Porphyry, Gra- 
nitic. 
Gratiot Lake, 164, 186. 
Gratiot River, 165, 187. 
Great Conglomerate. See Conglomerate, Great. 
Great Conglomerate Ridge, 164. 
Great Palisades, 146-148, 314-318. 
——, Diabases of, 315, 316, 317. 
——. Fluidal structure of felsites of, 98. 
——, Diabase-porphyrite of, 84, 316, 440, 442. 
— —, Glass inclusions in rocks of, 102. 
——, Quartz-porphyry of, 103, 109, 146, 147, 317, 318, 440. 
——, Relation of acid and basic rocks of, 435. 
Great Palisades (near), Gabbro of, 318. 
—-—, Diabase-porphyrite of, 36, 80, 84, 318. 
Greenstones, Huronian, 389, 390. 
Greenstone Range, 164, 165. 
Greenstone, The, 61, 71, 73, 87, 154, 164, 187. 
——, Alteration of, 70. 
—— at Eagle River section, 174, 175. 
——, Extent of, 140. 
——, Pumpelly on, 69, 70, 174. 
——, Thickness of, 178, 187. 
——, Thinning of, 187. 
——, Veins in, 424. 
Gros Cap, Amygdaloid of, 349. 
——, Felsite of, 349. 
——, Huronian rocks of, 401. 
——, Lake Superior synclinal at, 415. 
Gull Island, 330. 
Gunflint Lake, Schists of, 399. 
Hall, C. W., Publications of, 18, 23. 
Hancock, Sandstones and shales near, 193. 
Harbor Island, Trap of, 401. 
Hat Point, Animikie Group at, 368. 
Hill, E. P., 163. 
Hinkley, Potsdam sandstone near, 244. 
Hodge, J. T., Publication by, 16. 
Hornblende of hornblende-gabbro, 56, 57. 
——aungite-syenite, 114. 
—— granite, 125. 
—, Uralitic nature of, 114, 396. 
Hornblende-gabbro. See Gabbro, Hornblende. 
Houghton, D., 5. 
-- on conglomerates, 9. 
——, Eastern Sandstone, age of, 352. 
——, Keweenaw Series, age of, 12. 
—, Publications of, 14, 15. 
— on traps, origin of, 10. 
455 
Hubbard, B., 5, 16. 
Hungarian River, Eastern Sandstone on, 354, 355. 
——, Faulting on, 355. 
——, Wadsworth on rocks of, 363. 
Hunt, T.S., 5. 
—on Animikie Group, 157, 384. 
————, age of, 385. 
——, Bohemian Range, 180. 
—— Diabases, origin of, 10. 
—— Huronian of Thunder Bay, 377, 405. 
— — Keweenawan of Thunder Bay, 332. 
—— Nipigon Group, 157. 
—, Publications of, 19, 20, 21, 22, 23. 
— on quartz-porphyry of Nipigon Straits, 31. 
—— Volcanic ash, 437. 
Huron Bay, 414. 
Huronian, Marquette, and Menominee, 392-395. 
———, Diorites of, 393. 
———, Gneiss of, 393. 
———, Granite of, 394. 
— ——, Greenstones of, 393. 
——, kinds of rock of, 393, 394. 
——-—, Relations of, to Penokee Huronian, and Animikie 
Group, 894, 395. 
———, Schists of, 393. 
Huronian, Original, 386-391. 
——, Characteristics of, 386-389. 
——, Dikes of, 389. 
— —, Eruptives of, 390, 434, 445. 
——, Relation of, to Animikie Group, 385, 386, 390, 391, 399, 443. 
445. 
—--- , Lake Superior synelinal, 416-418. 
Huronian, Penokee, 391, 392. 
——, Relation of, to Animikie Group, 392. 
Hyperite of Macfarlane, 377. 
Tron River, Nonesuch shale belt on, 221, 222. 
——, Outer sandstone and conglomerate of Porcupine 
Mountains on, 220. 
——, Sandstones, &c., of, 222. 
Ironton Trail, Diabase porphyrite of, 83. 
——, Granitie porphyry of, 231. 
——, Orthoclase-gabbro of, 53. 
Isle Royale, 65, 164, 329-331, 414. 
——, Area of, 27. 
— —, Copper of, 430. 
——, Height of, 331. 
——, Sandstone of, 331. 
—-—, Thickness of Lower Division on, 159. 
——, Topography of, 330. 
——, Upper Division on, 154. 
—— vein, 189. 
Isle St. Ignace, 27, 334, 335, 413, 414. 
Jackson, C. T., 5. 
— on Bohemian Range, 180. 
—— diabases, origin of, 10. 
——, Keweenaw Series, age of, 12. 
—, Publications of, 15, 16, 17, 18, 19, 20. 
Julien, A. A., 23, 35, 45. 
—on alteration-products of olivine, 39. 
——orthoclase in gabbros, 41. 
—, Publication of, 23. 
Kakabika Falls, 374, 375. 
——, Animikie slates at, 330. 
Kaministiquia River, Animikie Group at, 371. 
—-—, Dikes on, 374. 
