1022 



THE GEOLOGY OF MINNESOTA. 



Franconia, 5t;-J. 



Fraser lake, rocks from, 638. 



French river, 429. 



rocks from, 163-1G5. 

 Friedel and Sarasin, 939. 



Frog Rock lake, rocks from, 517-519, 652, 710, 711. 

 Frog Rock river. .V.!5. 



rocks from, 538. 

 Gabbro, analyses, 85, 496, 5-43, 908. 



Archean, 15. 



contact on muscovadyte, 15, 982. 



Duluth, 81, 87, 91, 97. 



extension to cast. 5(i. 

 " " west, 57. 



Gabemichigarna lake, 984. 



general considerations, 985. 



granulitic,69, 982. 



Knife lake. 15. 



Little Falls, 15, 50. 



Motley, 15. 



origin, 70, 859, 979. 



phases of, 980. 



southern limit, 58. 



structural peculiarities, 59. 

 anurthosyte, 65,830. 

 Beaver Bay diabase, 63. 

 etl'ect on Animikie, 61. 

 feldspar masses, (J5, 830. 

 Grand Portage dikes, 61. 

 Logan sills. .V.I. 

 museovadyte. 07, 983. 

 peripheral phases, 69, 982, 987. 

 transitions, 982. 

 Gabemichigama lake, muscovadyte, 67, 68, 536. 



muscovadyte and gabbro, relations, 984. 



rocks from, 536, 657, 658, 699-706, 781-783, 905. 

 Garden lake, rocks from, 609, 610, 625, 626, 630-633, 



629, 912. 



Garden valley, 575. 



Garnet as a rock-forming mineral, 962. 

 Geikie, Sir Arch., 9i)4. 

 Genesis of Archean igneous rocks, 21, 972. 



greenstone, 21, 897. 



Geographical localities of rock numbers, 79. 

 Giant's range, conglomerate on south side, 44, 989. 

 Glauconite, 961, 990, 993. 

 Globular state of incipient minerals, 966. 

 Gneiss, kinds of, 20. 



transition from sediments and granites, 30, 975. 

 Gold ore, analysis, 842. 



Vermilion lake, 350-352, 359. 



west of Ely, 842. 



Good Harbor bay, rocks from, 248-251. 

 Gooseberry river, 184. 



rocks from, 177, 178, 394, 395. 

 Governor's Island, rocks from, 296, 297, 799. 

 Grace harbor, -rocks from, 418 . 

 Grand Marais, 252, 674. 



Manitou rocks, 74. 



rocks from, 252, 256-258, 409, 480. 

 Gradations in crystalline structure, 897, 073. 

 Grand Portage, conglomerate. Til. j]r>. 



dikes, 57, 61. 



graywacke, 46. 



island, 280, 412-416, 794, 795, 837. 



red rock. 57. 



rocks from, 279-283, 303, 412-416, 794, 795, 837. 

 Granite, analyses, 89. 161, 188, 206, 303, 315, 400, 515, 

 552. 553, 554, 564, 622, 666, 903. 



Archean, 19. 



Basswood lake, 321, 326, 635. 



Burntside lake, 336. 



cutting Upper Keewatin, 17. 



distribution of Archean, 9, 20. 



Duluth, 87, 90, 94. 



intrusions at end of Lower Keewatin, 15. 



Kekequaliic lake, 32, 640, 646, 659, 665, 715, 896. 

 from elastics, 32, 640, 900. 



later than Archean, 987. 



metamorphosing greenstone, 19. 



origin, 24, 27, 870, 878, 879, 897, 972. 



Pigeon point, 452. 



recomposed, 17. 



regarded as primordial rock, 23. 



Saganaga lake, 20, 314-317, 514, 515, 902. 



St. Cloud, 550. 



transition to sediments, 30, 897, 900-903, 973. 

 Granite City, 553. 

 Granophyre. !>5. 

 Grant, U. S., chapter on petrographic geology, 75-936. 



on Kekcc (liable conglomerate, 897. 

 " Kekequabic granite, 36, 660. 

 . " magnetic iron ores of Animikie, 49. 

 " museovadyte at Gabemichigama lake, 981. 

 " Zeta Lake rocks, :!7. 



rock series of, 78, 888-909. 

 Granulitic gabbro, 69, 9S5. 

 Gravel of disintegration, 93. 

 Graywacke, 379, 649, 826, 890, 901, 903. 



Grand Portage, 46. 

 Great Palisades. 221. 



rocks from, 209-218, 405, 556, 557. 

 Greenstone, 2. 



alteration to gabbro, 982. 



Archean, 2, 18, 987. 



conglomeratic, 13, 983. 



genesis, 21, 987. 



hill ranges, 14. 



metamorphism, 19, 70, 983. 



minerals, 2. 



oldest rock, 13, 27, 987. 



three epochs of, 990. 

 Greensand of the Mesabi Iron range, 990. 



see glauconite. 

 ( 1 reen wood lake, rocks from, 935. 



see Kast Greenwood lake. 

 (ireenw(X)d mountain. .VS. 

 Gunflint lake, Animikie on granite, 73, 996. 



iron-bearing member, 951. 



limestone. 312, iiss. 948. 



porphyritic di;tl>asc. <!i;. 



rocks from. 409-313. 510-513, 550, 676-680, 682 C/.i-J. 

 830-832, 888, 994, II Hi:,. 



rocks north of, CS-J (iS5. 1005. 



volcanic rocks at, 991. 

 Gunflint Lake iron mine, rocks from, 695-699, 805, 806, 



908. 

 Hale mine, 760. 



