590 



INDEX. 



Goodrich quartzite, relations to iron-ore deposits 396, 399, 547 



relations to Lower Marquette series 536 



relations to Michigamnio formation 411 



relations to Negaunee formation 377-378, 



382, 384, 410-411, 425, 427, 428, 430, 431, 433 



relations to Xegaunce jasper 383 



section of, at ilichiganime mine, showing rela- 

 tions of jasper ore aud conglomerate, figure of. 420 



with minor fold cut by dike, plate of 410 



{See Ishpeming formation.) 



Goose Lake 55, 240. 241, 252, 



255, 256, 257, 258, 269, 271, 272, 273, 275, 281, 282, 

 283, 285, 294, 295, 299, 308, 310, 314, 559, 560, 567, 568 



Grand Rapids mine 354,366,380 



Granite 3, 8, 9, 10, 11, 13, 15, 40, 79, 82, 98, 139, 



189, 190, 223, 225, 230, 231, 234, 239, 270, 276, 526, 541 



age of 40, 63, 66, 69, 75-76, 78, 83-84, 101, 104, 111, 128 



alteration of 2^1 



analyses of, referred to 62 



and quartzite, gradation between 147 



(See Archean, apparent gradations.) 



composition of 201-202 



described 18, 278 



dikes in Basement Complex 150,193 



in Laurentian 69 



Huronian 63 



intrusive in Azoic slat© 31 



in gneiss 138 



in iron-bearing formation 120 



in Kitchi schists 162 



in greens tone- schist 123 



in micaceous magnetite-schist 76 



in micaceous schist, figure of 193 



in Northern Complex 178,182,555 



in quartzite 29, 76 



metamorphic 66 



of conglomerate 232, 412, 442, 477, 483, 533, 557 



of Basement Complex 554 



origin of 40, 62-63, 69, 82, 101, 147 



pebbles in conglomerate 412, 4*2, 477, 483, 533 



range in composition of 201-202 



recomposed (see Kecomposed granite). 



relations to fragmental series 121-122 



relations to greenstone-shist 105, 111, 122-123 



relations to Huronian fragmentals ill 



relations to iron-ore deposits 547 



relations to Mesnard quartzite 239 



relation to "Wewe slate 276. 277 



stucco 271 



{See Gneiss, Gneissoid granite. Granitic group, 

 Hornblende-granite, Microgranite.) 



Granite Point 8, 15, 34, 35, 59. 1 13 



Granite-conglomerate 240, 557 



Granite-gneiss, relations to Mesnard quartzite 238 



(See Gneissoid granite.) 

 Granite porphyry, intrusive in Northern Complex. . . 182 



Granitic areas in Lake Superior region lOl 



Granitic group 83-84 



relations to sedimentary rocks 147 



Granitite. (See Biotite granite.) 

 Granitoid gneiss. (See Gneissoid granite.) 



Granophy ric growths in quartz diabase 520 



Graphite of slate 446, 453 



Graphitic schist 134 



Gray, A. B., on geology of the mineral lands of Lake 

 Superior 13 



Page. 



Gray, A. B., referred to q 



Graywacke 223, 224. 230, 



231, 233, 234, 235, 239, 342, 256, 258, 259, 260, 263, 267, 

 269, 271, 272, 273, 275, 376, 277, 278, 282, 287, 290, 292, 

 304, 306, 309, 313, 316, 318. 319, 320, 321, 324, 326. 332.' 

 410. 415, 434, 425, 427, 433, 434, 445, 452, 458, 560, 566 



brecciation of 268, 281 



described 228, 232, 265, 446 



enlargement of quartz grains in 100 



in Clarksburg series 460, 462, 482, 483 



iuterstratified with conglomerate 287 



metamorphism of 229, 230, 232, 233 



of conglomerate 431 



relations to Clarksburg series 462 



Gray wacke- slate 223 



described 228 



Green Island 521 



Green schist 113, 236, 237, 256, 476 



age of 128 



analysis of igg 



and granite areas, contrast in topography of 170 



described hq 



of conglomerate 224,232,234,235,240 



of Eureka mine 187 



of Mona schist area 152 



(See Greenstone-schist.) 



Green slate, origin of 30 



Greenstone 10, 20, 46, 49, 70. 153, 159, 160, 190 



alteration of 98, 396. 399, 538 



analyses of 495 



associated with iron-bearing rock 86, 131 



bluffs near Lake Angeline, plate of 332 



blufi's near Lake Bancroft, plate of 334 



bosses in Clarksburg series 460. 461 



bosses in Marquette series . . 487, 489-506, 518, 520, 522. 523 

 contact action of (see Contact action), 

 dikes (m- Dikes). 



dikes and bosses associated with ores 131 



in grunerite-magnetite-schist, plate of 328 



figure of 330, 386 



in Ishpeming formation 421,425,443 



in Marquette series. 487, 489-506, 506-514, 518-522. 523, 571 



in Negaunee formation 330,331,333, 



375, 379, 385-386, 389, 395, 396, 399. 402, 407, 529, 572 

 effect on development of griineritic and mag- 



netitic phases of 381, 383 



in Republic trough 470, 500, 503, 526, 528. 538 



in Upper Marquette 408 



including griinerite- magnetite- schist, plate of . . 330 



interbodded with sediments 500 



of Clarksburg formation 464-467, 



482, 483, 484, 485, 48&-499, 499-506. 523 



of post Clarksburg age 518,522 



of pre-Clarksburg age 488-518 



origin of 66-67,102,103,148 



relations to greenstone-schiet 1, 147 



relations to Ishpeming formation 425 



relations to sedimentary rocks 101. 489-490, 499 



sheets in Marquette series 500. 507. 514-517, 522, 523 



(See Sheet greenstone.) 



varieties of 58 



veins in granite 8, IQ 



(See Basalt. Diabase, Diorite, Epidiorite, Porphy- 

 rite, Greenstone-conglomerate, Greenstone- 

 schist.) 

 Greenstone-conglomerate, at Deer Lake 74,86, 115.117,125 



