1026 



THE GEOLOGY OF MINNESOTA. 



Redrock bay, rocks from, 270. 

 Redroek crook, rocks from, 271. 

 Redrock point, rocks from, 271-275, 792. 

 Rodstone, rocks from, 563-505. 

 Redwood Falls, 735. 

 Republic, rocks from, 756, 809. 

 Republic mine, 844. 

 Reunion, Mt, rocks from, 834, 835. 



sills, 59. 



Rice Point granite, 81, 91. 

 Rice lake, rocks from, 639. 

 Rice rivor, rocks from, 606. 

 Rook harbor, rocks from, 427-429. 

 Rock numbers, 78, 79. 

 Rock series, 78. 



Rosenbusch, H., on older rocks, 26. 

 Rove lake, rocks from, 834, 835. 

 Royale isle, conglomerate, 52. 



rocks from, 418-4.39. 

 Rutile, as a rock-forming mineral, 962. 

 Saddle Bags lake, rocks from, 709, 710. 

 Saganaga lake, arkose, 317, 827. 



granite, 20, 314, 514, 515, 902. 



recomposed granite, 17, 827. 



rock at portage to Oak lake, 6, 317, 826. 



rocks from, 314-317, 514, 550, 827-829, 902. 

 St. Cloud, rooks from, 550-552, 564, 566, 838. 

 St. Croix rivor, 502. 



St. Louis river, rocks from, 368-390, 814. 

 Sand lake, rocks from, 911. 

 Sandstone, Hinckley, 53. 

 Saturday lake, rocks from, 846, 847. 

 Sauk Centre, rocks from, 574. 

 Sauk Rapids, rocks from, 565, 567. 

 Sawbill lake, 535. 

 Sawteeth range, 265, 278, 936. 

 Schist, passing to granite, 34. 

 Scovill's point, rocks from, 430-432. 

 Sea Gull lake, rocks from, 515. 

 Secondary minerals, 968. 

 Security mine, 764. 

 Serpentine, 847. 



Sericite, as a rock forming mineral, 945. 

 Shale, analysis, 555. 

 Sharpless, F. F., analysis by, 496. 

 Sharpless and Winchell, analyses by, 230, 842. 

 Shearing and crushing phenomena, 971. 

 Short Line park, conglomerate, 52, 53. 



diabase, 64. 



gabbro, 57. 



rocks from, 810, 811, 838. 

 Sickle bay, 265, 266, 791. 

 Sidener, C. F., analyses by, 102, 193, 226, 288, 303, 313, 



519, 543, 552, 763. 



Siderite, as a rock-forming mineral, 948, 994. 

 Silica, precipitation of, 40, 42. 

 Silica-kaolin, analysis, 763. 

 Silver City, rocks from, 610, 729. 

 Silver creek, rocks from, 175, 465, 466, 558. 

 Silver islet, rocks from, 439-445. 

 Sioux Falls, rocks from, 563, 569. 

 Sioux quartzyte, 52, 54. 

 Siskiwit bay, rocks from, 419-421. 

 Siskiwit lake, rocks from, 422. 

 Slate conglomerate, 19. 



Sliito member of Animikie, 40. 

 Snowbank lake, conglomerate, 5. 



ruetamorphism at, 11. 



musoovadyto, 08. 



oldest quartz-porphyry, 41. 



rooks from, 767-774. 854-850, 896. 920. 



rooks southwest of, 864-877, 894-896, 926. 

 Soudan, copper, 885. 



rocks from, 587, 589-590, 000. GUI, 730, 732. 733, 

 743 745, 811-813, 883-880. 



see under definite mines. 

 South Devil Track lako, rocks from, 4 SO. 

 South Fowl lake, rooks from, 304, 800, 8(17. 

 South lako, rooks from. 509. 

 South Side lake, 545. 

 Sphene, as a rock-forming mineral, 90]. 

 Splitrock point, rocks from, 180-183, 398, 558. 

 Splitrook river, rocks from, 181-183, 395-398. 

 Spoon lake, rocks from, 726. 

 Spotted rock lake, 545. 

 Spurr, J. E., on taoonyto, 367, 990. 



rook series of, 78, 927-934. 



on glauconite, 961. 

 Stair portage, 509. 



Staurolite, as a rook-forming mineral, 902. 

 Stone mine, rocks from, 591, 592,594-590, 001, 730, 743. 

 Straight lake, rooks from. 493. 494. 

 Stratigraphy of Art-bean f ragmen tals, 12. 

 Streng, on hornblende gabbro, 80. 

 Strike of Animikie, 48. 

 Strike of Upper and Lower Koowatin, 17. 

 Structural field relations of the gabbro, 981. 

 Structural geology, chapter on, 1-74. 

 Structure of Archean, 8. 

 Structure of Archean fragmentals, 12. 

 Stuntz bay, Vermilion lake, rocks from, 582 580, 



821-826, 914. 



Stuntz conglomerate, 5, 17, 343, 977. 

 Stuntz island, rook from, 582-580, 826, 914. 

 Submarine extrusion, 979, 981. 

 Sucker bay, rocks from, 105-107. 

 Sucker lake, rooks from, 861. 

 Sucker river, rooks from, 394. 

 Sudbury, volcanic breccia, 153. 

 Sugar Eoaf point, rocks from, 2: 52 234. 

 Sunset peak, rocks from, 918. 

 Superior, lake, divisions of ooast line, 79. 



rocks from, 81-303, 390-466, 54S. 54!). 554-558, 

 571-573, 741, 788-800, 813, 814. 



see under definite localities. 

 Susie island, rocks from, 296, 297. 

 Swan river, 568, 758. 

 Taconic, 44. 



age of Animikie, 47. 



age of Puckwunge conglomerate, 54. 



base of, 44. 



Cabotian epoch of eruption, 55. 



extent of Animikie, 46. 



Grand Portage conglomerate, 40. 



igneous rocks, 55. 

 Cabotian, 55. 

 Manitou, 55. 

 possibly pre-gabbro eruptives, 55. 



iron-bearing member, 45. 



later Keweenawan fragmentals, 52. 



