448 



INDEX. 



Animikie Group, Dikes of, 144, 367, 368. 



, Dike-rock from, 372, 373. 



at Grand Portage Bay, 297, 369. 



, Interbedded diabases of, 373, 374, 445. 



at Kaministiquia River, 380 



, Limits of, northern and western, 384. 



at Lucille Islands, 369. 



on Mesabi Range, 382-384. 



at Pigeon Point, 369, 370, 379. 



on Pigeon River, 370, 382. 



at Pokegonia Falls, 383. 



, Portage Bay Island, 297. 



, Relation of, to granites of Mesabi Range, 399. 



, Huronian, 443, 444. 



Keweenaw Series, 297, 385, 405, 443-445. 



South Shore Huronian. 385, 386. 



on Saint Louis River, 262, 384. 



at Silver Islet, 378. 



on Thunder Bay, 371-379. 



, Views on age of, 157, 385, 443. 



criticized, 385, 386, 



on "Wauswaugoning Bay, 368, 369. 



Anorthite-rock, 59-61. 



in Agate Bay Group, 292. 



— in Beaver Bay gabbro, 310, 436, 440. 

 — , Characteristics of, 59. 



— , Constituents of, 59, 438-440. 



differs from European gabbros, 59. 



— , Localities of, 59. 



— , Mode of occurrence of, 59. 



— at Split Rock River, 302, 438, 439. 



— , Tabulation of observations on, 59-61. 



Anorthite of anorthite-rock, 59. 



— , Analyses of, 438,440. 



— , Determination of, by Thoulet's method, 438-440. 



of olivine-diabase or melaphyr, 70. 



— of orthoclase-free gabbro, 40. 



Anae aux Crepes, Keweenawan rocks of, 348. 

 Apatite of diabase porphyrite, 79. 

 of hornblende-gab bro, 57. 



— of orthoclase-gabbro, 52. 



— of orthoclase-free gabbro, 43. 



Apostle Islands, Sandstones of, 153, 154, 365. 



Argillite of Nipigon Lake Basin, 340. 



Ash, volcanic, Absence of, in Keweenaw Series, 32, 138, 139, 



436, 437. 

 Ashbed-diabase of Bohemian Range, 183. 

 , Distribution of, 155. 



— of Eagle River section, 171-173. 



— of Lester River Group, 279, 280. 

 — , Origin of name, 138, 173. 



— , See Diabase-porphyrite. 



Ashbed Group of Keweenaw Point, 140, 171-173. 



, Characteristics of, 138. 



, Section of, 186. 



, Thickness of, 178. 



Atlantic Mill 130, 192. 

 Augite of amygdaloids, 88. 



anorthite-rock, 59. 



augite-syenite, 114. 



basic original rocks, 37, 38. 



diabase-porphyrite, 78, 79. 



(porphyritic), 79. 



olivine-di b^se, 70. 



olivine-f ree diabase, 63, 64. 



orthoclase-gabbro, 41, 42. 



Angite of orthoclase-free gabbro, 52. 



quartz-porphyry (porphyritic), 102. 



quartzless porphyry fporphyritio), 93. 



Augite-syenite, 112-125. 



— of Beaver Bay, 122, 306. 

 Brick Island, 369. 



— , Characteristics of, 112. 

 — , Constituents of, 112-115. 



, augite, 114. 



, feldspars, 112, 113, 114. 



, ferrite, 113. 



, hornblende, 113. 



.magnetite, 114. 



, quartz, 112, 113. 



, secondary. 113, 114, 438. 



— , Localities for, 115. 



— of Mount Bohemia, 184. 

 — , Name of, 115. 



— , relations of, 115. 



— of Saint Louis River Group, 270, 271. 

 — , Tabulation of observation on. 116-124. 



— of Victoria Islands, 372, 373. 

 — , See Porphyry, Granitic. 



Azoic Rocks, Report on. See Hunt, T. S. 

 Bad River, Augite-syenite of, 115. 



, Gabbros of, 40-41, 144, 154, 155, 231, 377, 435, 436. 



, Granite of. 233,435. 



, Hornblende-gabbro, region of, 56. 



, Laphani on sandstone of, 411. 



, Orthoclase-gabbro of, 52, 54. 



, Orthoclase-free gabbro of, 44, 45. 



, Quartz-porphyry of, 103, 150, 231, 433. 



, Relation of acid and basic rocks on, 435. 



, Sandstone of, 132, 231. 



, Sources of information on, 207. 



, Thickness of Keweenaw Series on, 231. 



, Lower Division on, 158. 



Baptism River, Bay, and vicinity, Ashbed-diabase of, 318, 326. 



, Augite-syenite of, 116, 123. 



, Beaver Bay Group on, 298, 318, 319. 



, Diabase-porphyrite of, 85, 326,440. 



, Felsitic-porphyry of, 110, 318. 



, Gabbro of, 272. 



, Quartz-porphyry of, 102, 103, 147, 158, 314, 318, 319, 447. 



, Relation of acid and basic rocks of, 435. 



, Temperance River Group on, 823, 326. 



Baraboo, Relations of Huronian and Potsdam at, 444. 



Bare Hills, Felsite of, 149, 182. 



Bare Point, Ashbed-diabase of, 375. 



Barrande, J., Western equivalents of 1st and 2d faunas of, 443. 



Basic original rocks, 35-91, 134-144. 



, Age of, 12,13. 



, Amygdaloids of, 134-139. 



, Characteristics of, 134-144. 



, Classifications of, 35, 37. 



, Coarse-grained, 37-6' . 



, anorthite-rock, 59-61. 



, hornblende-gabbro, 56-58. 



.orthoclase-gabbro, 50-56. 



, orthoclase-free gabbro, 37-50. 



, Dikes in, 143. 



, Dip of, 141,142. 



, Effect on topography, 141. 



, Extent of single beds, 140. 



, Fine-grained, 61-91. 



, amygdaloids, 87-91. 



