INDEX. 
Eagle Mountain, Orthoclase-gabbro of, 53, 56. 
Eagle River Section, 167-178. 
———, Amygaloids of, 170-172. 
———, Ashbed Group of, 171-173. 
———, Diabases of, 170. 
——— Diabase-porphyrite of (beds 45, 65, 66), 80. 
———, Extent of, 141. 
———, Great Conglomerate of, 166-168. 
---—- » Pebbles of, 93, 104, 115, 118, 
———, The Greenstone of, 174, 175, 178, 187. 
———, Kingston Conglomerate of, 177. 
———, Limits of, 166. 
——— Marvine’s Group ‘‘A” of, 173, 174. 
——-—, Melaphyr of (beds 22, 69, 87), 66, 67, 170. 
—-——, Olivine diabase of (greenstone beds), 73. 
——— Orthoclase-gabbro of (bed 94), 52, 53, 174, 175, 176. 
——-— Orthoclase-free gabbro of (beds 96, 107), 44, 45, 175. 
——-—, Phenix Mine Group of, 175, 176. 
——-—, Pumpelly on, 62, 168, 175. 
——-—, Sandstone of, 169, 171. 
——-—, Summary of, 177, 178,. 
———, Thickness of, 178. 
Eames, H. H., on East coast of Lake Superior, 27, 347, 349. 
—-—, Publication by, 20. 
Eastern Sandstone, 351-365. 
——, Age of, 12, 351, 352. 
——, at Béte Grise Bay, 185, 353, 354. 
——, Clay holes in, 185, 357. 
—-—, Conclusions regarding, 365. 
—— on Douglas Houghton River, 355, 356. 
—-—-excluded from Keweenaw series, 24. 
——, Extent of, 351. 
——, Foster and Whitney on, 361, 362. 
——on Hungarian River, 354. 
——on Lake Agogebic, 360. 
——-— Portage Lake, 185, 359. 
——, Relation of, to Mississippi Valley sandstone, 351, 442-445. 
————— Keweenaw Series, 360-365, 442-445. 
----— Trenton limestone, 352. 
——— —— Western Sandstone, 366. 
—— on South Range, 360, 361. 
——, Theories as to, 361-365, 442-445. 
——on Torch Lake Railroad, 356-358. 
——, Wadsworth on, 354, 355, 357-359. 
——, Winchell on, 442. 
Edward Island, Sandstone conglomerate and trap of, 336. 
Egleston, F., Publication of, 22. 
Emerson, L. G., 3, 202. 
Emmons, E., Taconic Group of, 443. 
Encampment Bluff, Diabase-porphyrite of, 84, 285, 433. 
——, Olivine-diabase near, 76. 
—-—, Orthoclase-free gabbro of, 47, 286. 
Encampment River, Agate Bay Group on, 284, 285, 289. 
——, Flowage structure in rocks of, 291. 
—-—, Lester River Group on, 279, 281-283. 
Encampment Island, Orthoclase-free gabbro of, 286. 
English Lake, Hornblende-gabbro of, 58. 
Epidote of amygdaloids, 89, 90. 
—— diabase-porphyrites, 79. 
—— sandstones, 128. 
Eruptives, Acid. See Acid original rocks. 
—,Basic. See Basic original rocks. 
—, Tertiary, Order of, 432. 
—-—, Relation of to Keweenawan, 436. 
Faults in Agate Bay Group, 290, 291. 
—— Beaver Bay Group, 312. 
453 
Faults at contact Eastern Sandstone and Keweenaw Serica, 
865. 
— of Douglas County Copper Range, 258. 
— at Great Palisades, 319, 
—on Hungarian River, 355. 
— — Keweenaw Point, 158, 205, 365. 
———~—, Foster and Whitney on, 361. 
———-—, End of, 208. 
————0n Montreal River, 230. 
————, Effect of, on South Range, 205. 
— of the Keweenaw Series, 416, 417. 
—— — North Shore, 142, 290, 291, 312, 319, 329. 
——— Porcupine Mountains, 219. 
—— Temperance River, 329. 
Feldspars of amygdaloids, 88. 
— — augite-syenite, 112, 113, 114. 
—— diabase-porphyrite (porphyritic), 79. 
—— granite, 125. 
—— olivine-diabase, 70. 
—— quartz-porphyry, 98, 101. 
———-— (porphyritic), 97. 
——quartzless porphyry, 92. 
—, Methods of determining, Des Cloizeaux’, 39. 
————, Thoulet’s, 437, 438, 489. 
—, Nature of, 39, 437-440. 
—, Silica content of, 437-440. 
—, Tschermak’s theory of, 437-439. Sce Plagioclase, 
Felsites, 95-115. 
—, Banding in, 97. 
— of Bare Hills, 182. 
—— Beaver Bay Group, 311, 312. 
—, Characteristics of, 95-102. 
—, Color of, 96. 
—, Constituents of, 98, 102. 
——-—, augite, 102. 
——— ferrite, 98, 101. 
——-—, ‘‘greenish substance,” 100. 
—-—-—, orthoclase, 99. 
———, quartz, 99. 
————, secondary, 99, 100. 
—, Flowage in, 97, 98. 
—, Glass-base in, 99. 
—, Localities for, 102. 
—, Matrix of, 96-98. 
— of Little Montreal River Bay, 183. 
—of Michipicoten Island, 343. 
—of Mount Houghton, 182, 
—, Origin of, 102. 
—of Porcupine Mountains, 212. 
—, Porphyritic ingredients of, 97, 98, 101, 102. 
— Rosenbusch on, 96. 
—of Stannard’s Rock, 197, 198. 
—, Tabulation of observations on, 104-115. 
—. See Porphyry, Quartz-. 
Felsitic porphyry. See Felsites. 
Ferrite of amygdaloids, 88. 
— —augite-syenite, 113. 
—— felsites, 99, 101, 102. 
—— orthoclase-free gabbro, 41. 
—— quartz-porphyry, 98, 100, 102. 
—— quartzless porphyry, 92. 
Fire Steel River, 200. 
Flambean Trail, Gabbros of, 236. 
Flint Steel River, 200. 
Flowage-structure in felsitic porphyry, 139. 
— in amygdaloids, 88, 139. 
