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 Pokegoma Falls, 383. 
——~-—, Portage Bay Island, 297. 
— —, Relation of, to granites of Mesabi Range, 399. 
— ———, Hnuronian, 443, 444. 
— — — — Keweenaw Series, 297, 385, 405, 443-445. 
—— —— South Shore Huronian, 385, 386. 
——on Saint Lonis 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. 
—, Characteri&tics 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. 
Anse aux Crépes, Keweenawan rocks of, 348, 
Apatite of diabase-porphyrite, 79. 
—of hornblende-gabbro, 57. 
—of orthoclase-gabbro, 52. 
— of orthoclase-free gabbro, 43. 
Apostle Islands, Sandstones of, 153, 154, 365. 
Argillite of Nipigon Lake Basin, 340. 
Ash, voleanic, 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, 171-178. 
———-~—, 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 base, 70. 
—— olivine-free diabase, 63, 64. 
—— orthoclase-gabbro, 41, 42. 
Augite of orthoclase-free gabbro, 52. 
—— quartz-porphyry (porphyritic), 102. 
——quartzless porphyry (porphyritic), 93. 
Augite-syenite, 112-125. 
— of Beaver Bay, 122, 306. 
—— Brick Island, 369. 
—, Characteristics of, 112. 
—, Constituents of, 112-115. 
——-—, angite, 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, Reporton. 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. 
——, Lapham 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 hiver, 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. 
———, Quarta-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 1stand 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. 
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