INDEX. 



1027 



limestone, 45. 



metamorphistn of Animikie, 50. 



Pokegama quartzyte, 45. 



Puckwunge conglomerate, 50. 



see under Animikie and Keweenawan. 



summit of Animikie, 47. 

 Taconyte, origin of 929, 990. 



at Prairie River falls, 991. 

 Taylor's Palls, orthoclase, 29. 



rocks from, 549, 559-562, 572, 843, 844. 

 Temperance river, 458, 54G. 



rocks from, 235-239, 805, 936. 

 Terrace point, 251. 



rocks from, 248, 4C5-409. 

 Thalite, analysis, 169. 

 Thessalon point, rocks from, 673. 

 Thomas lake, rocks from, 638. 

 Thomson, 838. 



rocks from, 377-379, 573, 749. ' 

 Thomsonite, analyses, 428, 4,33. 

 Thunder bay, rocks from, 439-445. 

 Titaniferous magnetite, analysis, 496. 

 Tourmaline, as a rock-forming mineral, 947. 

 Tower, conglomerate and green schist, 16. 



rocks from, 361, 577-582, 592-594, 597-600, 730, 

 732, 742-745, 887. 



see under definite mines. 

 Tower mine, rocks from, 587, 742. 

 Town Line lake, 709. 



rocks from, 519, (551. 



Transition, between clastic greenstone and gabbro, 

 984. 



between sediments and granites, 30, 32. 

 Tremolite, as a rock forming mineral, 960. 

 Triangle lake. 863. 



Tucker lake, rocks from, 508, 908, 909. 

 Tuff, between Otter Track and Oak lakes, 826. 



earliest, 7. 



from Duluth, 103, 109, 118, 151. 

 " Gunflint lake, 994. 

 " the Palms mine, 809. 

 " Kekequabic lake, 722. 

 " Mesabi Iron range, 1001. 

 Twin peaks, greenstone, 19. 



rocks from, 533-535, 711-713, 777, 778. 

 Two Harbor bay, rocks from, 183-185, 557. 

 Two Harbor rock, 183, 262. 

 Two Harbors, use of name, 466. 

 Two Island river, rocks from, 234. 

 Unconformity at base of Animikie, 47. 



in Archean fragmentals, 12. 



Upham, Warren, onAitkin County (juartzyte, 58. 

 Upper Keewatin, 16. 



conglomerates, l(i. 



folding of, 17. 



order of succession, 16. 

 Uralite, a form of hornblende, 960. 

 Urn lake, rocks from, 913. 

 Van Hise, C. R., on Archean, 1. 



on hornblende growths, 583, 7i)7. 

 " a volcanic epoch on the Penokee range. 992. 



Vermilion lake, conglomerates, 5. 



gold ore, ,350-a52, 359. 



rocks from, 340-362, 576-609, 811, 812, 815-826, 

 914-918. 



see under definite localities. 

 Vermilion river, Ontario, rocks from, 746, 747. 

 Virginia, rocks from, 762-765, 788. 

 Virginia mine, 764. 

 Volcanic action, in Archean, 27. 



in the Mesabi Iron range, 997, 1001. 



' ' the Penokee Iron range, 992. 

 Von Cotta, on older rocks, 25. 

 Wadsworth, M. E., on jaspilyte, 3, 344. 998. 



on enstatite, 200. 

 " secondary olivine, 472. 



rock descriptions by, 143, 146, 190, 263, 300, 471, 

 479, 492, 497, 500, 501, 503, 509, 511, 518-521, 

 527, 539, 541, 543, 545. 

 Waltershausen, on older rocks, 25. 

 Washington harbor, rocks from, 418. 

 Watab, rocks from, 553. 



Wauswaugoning bay, rocks from, 286-292, 795. 

 Werner, on older rocks, 22. 

 West bay, Vermilion lake, rocks from, 604-60G. 

 West Breitung mine, rocks from, 811. 

 West Sea Gull lake, rocks from, 515-517, 829. 

 Wick's Camp, rocks from, 751-755. 

 White, C. A., on Sioux quartzyte, 52. 

 White Iron lake, rocks from, 610, 611, 668-672, 729. 



765. 

 Williams, G. H., on ancient volcanic rocks, 104. 



on hornblende growths, 583, 797. 

 " slates of Pennsylvania, 9112. 

 1 ' volcanic breccia, 153. 

 Winchell, A., breccia at Black Fly bay, 996. 



relation of noryte to gabbro, 984. 



rock series of, 78, 909-913. 



Winchell, A. N., on granite at Koochiching falls, 1003. 

 Winchell, H.V., on chemical precipitation of silica, 40. 



on muscovadyte, 71. 



rock series of, 78, 914-926. 

 Winchell, N. H., chapter on petrographic geology, 



75-936. 



chapter on structural geology, 1-74. 



chapter on the mineralogy and petrology of Min- 

 nesota, 937-999. 



on chemical precipitation of silica, 40. 



rock series of, 78, 81-888. 



structure of the Keweenawan, 1000. 

 Wind lake, jasper, 4. 



rocks from, 542-544, 853, 882, 883. 

 Wolff, J. E., 990. 



Wood lake, rocks from, 853, 882. 883. 

 /coiites, 946. 

 Zeta lake, conglomerate, 6. 



porphyrel, 33, 37, 780, 974. 



rocks from, 780. 



Zircon, as a rock-forming mineral, 962. 

 /oisite, as a rock-forming mineral, 946. 



