INDEX. 
St. Croix River, Authorities on geology of, 240. 
——~—, Contact of Potsdam sandstone and Keweenaw Series 
on, 236-288. 
——-—, Diabase exposures on, 243. 
——-—, Lower Division on, 159. 
———, Prospects for copper on, 428. 
— ——, Relation of rocks of, to Keweenaw Point rocks, 239- 
241. 
———, Sandstone of, 243, 411, 443, 444. 
———, Termination of Lake Superior synclinal on, 411, 412, 
414, 
——-—, Upper Division on, 153. | 
Saint Louis River Gabbros, 156, 268-275. 
——_—, Augite-syenite of, 270. 
——— at Brnulé Lake, 274, 275, 294. 
—— —, Characteristics of, 266. 
——— on Cloquet River, 268, 269, 272. 
——-—, Dip of, 269. 
———at Duluth, 269-272. 
—— —— Eagle Mountain, 273. 
——~—, Extent of, 268. 
——-—, Felsitic porphyry of, 271, 272. 
Saint Louis River, Animikie Group on, 262, 384, 412. 
——~—, Dikes of, 384. 
———, Gabbro of, 263. See Saint Louis River Gabbros. 
———, Sandstones of, 262. 
Sand Point, 178. 
Sandstone of Animikie Group. See Animikie Group. 
—,Cambrian. See Cambrian. 
—, Eastern. See Eastern Sandstone. 
—, Keweenawan, 127-133, 420. 
——of Agate Bay Group, 292, 293. 
——— Albany and Boston Conglomerate, 130. 
——— Atlantic Mill, 130, 192. 
———Bad River, 1382, 227, 233. 
———Batchewanung Bay, 348. 
——— Black Bay, 24, 128, 156, 333, 336, 337. 
——— Cape Choyye, 347. 
——— Calumet Conglomerate, 130. 
———Caribou Point, 328. 
——— Carp River, 132. 
_ —— Constituents of, 127, 128. 
—— of Copper Falls, 129, 130, 171. 
——, Copper in, 420. 
——of Eagle Harbor, 128. 
——— Eagle River Section, 169, 171. 
——— Good Harbor Bay, 329, 
——— Isle Royale, 331. 
——— Lester River, 292. 
——— Montreal River, 133, 225, 404. 
——— Nipigon Bay, 333, 336. 
———— Lake, 24, 339, 340. 
— —— Nonesuch Mine, 131, 182, 221. 
——, Nonesuch sandstone belt, 221-224. 
——of Ontonagon River, 199, 200. 
——— Pointe aux Mines, 347. 
—— —Porcupine Mountains, 132, 215-217, 220, 221. 
——-— Portage Entry, 193. 
—--- , West of, 200. 
——— — Take, 192, 193. 
———St. Croix River, 246-250. 
= Silver Islet Landing, 133, 378. 
——— Temperance River, 385. 
———Thnunder Bay, 156, 157, 333, 376, 377, 411. 
——— Upper Division, 152-154. 
—-—, Veins of, in diabase, 139, 140, 292, 293. 
——-of White River, 233. 
461 
Sandstone, Potsdam. See Potsdam. 
—, ‘‘Metamorphic.”” See Norwood. 
—, Nonesuch Belt. See Nonesuch. 
—, Western. See Western Sandstone. 
Sault Ste. Marie, 413. 
Sawteeth Mountains, 142. 
Schists, shales, and slates, of Batchewanung Bay, 400. 
——, Grand Portage Bay, 247, 367, 405. 
——, Gunflint Lake, 399. 
—— Hat Point, 368. 
—— Kaministiquia River, 374, 375, 380. 
—— Lucille Islands, 369. 
—— Mesabi Range, 382-384. 
—— Michipicoten River, 400. 
—— Mission Creek, 262. 
——Nipigon Lake, 408. 
—— Pigeon Bay, 369-374. 
—— Pokegoma Falls, 383, 384. 
—— Rainy Lake, 397. 
— — Red River Road, 380. 
—— Saganaga Lake, 397. 
—— St. Louis River, 262, 384. 
—— Slate Islands, 401. 
— — Thompson, 262. 
—— Thunder Bay, 375-380, 396, 397. 
—— Wauswaugoning Bay, 368. 
— — See Animikie, Huronian, Nonesuch, Porcupine Mts. 
Science, Vol. I., 441, 442, 443. 
Section of Animikie Group (Bell), 380. 
—on Agate Bay, 288-290. 
—on Bad River, 232. 
—— Eagle River, 177, 178. 
—of Huronian (Logan), 386-388. 
—on Keweenaw Point, 186, 187. 
———of Lake Superior Basin, 417, 418. 
— on Minnesota Coast, 266. 
— — Montreal River, 227, 228. 
—— Ontonagon Section, 198-201. 
—, Penokee Huronian, 391, 392. 
—on Portage Lake, 194, 195. 
— — Potato River, 230, 231. 
— — Snake River, 242. 
—— Split Rock River, 301-303. 
—— Temperance River Group, 328. 
—— Thunder Bay (Bell), 332. 
——T. 60, R. 2, W., 328. 
Selwyn, A. R. C., on Michipicoten Island, Specimens from, 4, 
342, 
—, Publication of, 23. 
Shales. See Sandstone schists. 
Shumard, B. F., Publication of, 17. 
Silver Creek, Diabase-porphyrite of, 80, 84. 
——, Olivine-diabase of, 76. 
——. See Encampment Bluff. 
Silver Islet, Dikes of, 378. 
—-—, Slates of, 331. 
Silver Islet Landing, Dikes of, 377. 
——-—, Sandstone of, 133, 378. 
Silver Mountain, 202, 203. 
Simpson’s Island, Sandstone of, 336. 
Slate Islands, 401. 
Slates. See Schists. 
“Slide, The,” of Eagle River, 175. 
Snake River, Chamberlin on rocks of, 242, 243. 
—-—, Conclusions regarding rocks of, 245, 246, 412. 
—-—, Sandstone of, 240. 
See Kettle River. 
