iM)i:x. 



453 



Eagle Mountain, Orthoclasc-gabbro of, 53, 50. 



Eagle River Section, 167-17& 



. Amygaloids of, 170-172. 



. Ashbed Group of, 171-173. 



, Diabases of, 170. 



. Diabase-porphyrite of (beds 45. 6S, 66), 80. 



.Extent of, 111. 



. Great Conglomerate of, 166-168. 



, Pebbles of, 03, 104, 115, 118. 



■ The Greenstone of, 174, 175, 178, 187. 



, Kingston Conglomerate of, 177. 



, Limits of, 166. 



.Marvine's Gronp "A" of, 173, 174. 



■ Melaphyr of (beds 22, 60, 87), 66, 67, 170. 



, Olivine diabase of (greenstone beds), 7:;. 



, Orthoclase-gabbro of (b. id f5,176. 



, Orthoclase-free gabbro of (beds 96, 107), 11, 15, 175. 



, Phcenix Mine Group of, 175, 170. 



, Pumpelly on, 62, 168, 17;.. 



, 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 Bete 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, 301. 



, Theories as to. 301-365, 442^45. 



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 Kiver, Agate Bay Gronp 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. 



Ernptives, 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. 



Faults at conta. I Eastern Sandstone and Keweenaw Series, 

 365. 



Palisades, 319. 

 —on Eungarian Eli 



, Poster and Wi 



, End of, 208. 



on Mom i 



, Effect of, on S.. u.. 



— of the Keweenaw 



North Shot. :\o t 320. 



Porcupine Mount. 1, 



Tempers 



Feldspars of amygdaloids, 88. 



augite-syenite, 112, 113, 114. 



diabase-porphyrite (porpbyritie), 79. 



granite, 126. 



oli vine-diabase, 70. 



quartz-porphyry, 98, 101. 



(porphyritic), 97. 



quartzless porphyry, 92. 



— , M. thods of determining, Dcs Cloizeau.x*. 89. 



, Thonlet's, 437, 438, 439. 



—.Nature of, 39,437-440. 



— , Silica content of, 437-440. 



— , Tschermak's theory of. 4:(7-430. Set Plagioclase. 



< M.J-115. 



in. 07. 

 Boils, 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, 163. 



— 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 porphyTy. See Felsites. 



Ferrite of amygdaloids, 88. 



augite-syenite, 113. 



felsites, 99, 101, 102. 



orthoclase-free gabbro, 4L 



quartz-porphyry. 98, 100, 102. 



quartzless porphyry, 92. 



Fire Steel River, 200. 



Flambeau Trail, Gabbros " 



Flint Steel River, 200. 



Flowage-strncture iu felsiUo porphyry, 139. 



— in amygdaloids, 88, 139. 



