594 



LXDEX. 



Page. 



Iron oxide of breccia 326 



of brecciated slate 263 



of conglomerate 265.413,429 



of chert aud jasper con<;lomerate 414 



of ferruginous chert 370 



of gravwacke 228, 365 



of iron-bearing formation 381, 529 



of mica shite 458 



of novaculite 207 



of pseudo-cou glomerate 306 



of qiuirtzite 227,257,292 



of slate 266,273,292,317 



Iron pyrites of slate 273 



Iron-bearing formation 109, 



110, 1 13, 114, 117, 118, 120, 127, 528. 576, 579 



banding of 531 



conglomeiiite at top of 89 



existence of two 130 



extension of 406-407 



origin of 531 



reUtions to diorite 86,90-91.113 



{See Iron-bearing series, Negaunee formation.) 



Iron- bearing horizon in arenaceous slate group 148 



Irving, K. D.. on age juid origin of gneiss and granite 101-104 

 on Archean formations of the Northwestern 



States..... 101-104,104-106 



on classification of early Cambrian and pre-Cam- 



brian formations 112-113 



on divisibility of Archean in the jS^orthwest lOi-106, 



H2-U3 

 on equivalency of Hnronian rocks in Marquette 



and Penokee districts 68 



on Hnronian group 110-112 



on Hnronian series 97-9S 



on Keweenawan series 97-98 



on origin of Hnronian rocks 98 



on origin of greenstone-schist 122-123 



on origin of jaspers and ores 102-103, 106-109 



on position of greenstone-schist 120-123 



on serpentine of Presque Isle 103 



on stratigraphy of Huronian series 67 



on structure of Lake Superior region 101-104 



on structure of Marquette district 101-102 



on succession in Lake Superior reigon 110-112 



on succession in Marquette district 102 



on term Agnotozoic 112 



referretlto 1.7,14.115,116,119,125,130, 



139, 141. 146. 150. 162, 232. 395, 400, 449, 457 

 with C. K. Tan Hise. on enlargement of quartz 

 grains in sandstone 



Isbpen 



3, 



4, 32, 53, 67, 74, 75, 77, 86, 89, 90, 91, 93, 103. 115, 117, 

 128.139,151, 329. 330, 331. 332, 336, 33S, 356, 358, 373, 

 376, 378, 379. 380, 382, 383, 392. 395, 408, 409, 410, 416. 

 425, 427. 432, 444, 455. 488, 489, 490, 498, 501, 564, 579 



Ishpeming basin 396,410 



Ishpeming formation 312. 365, 376. 388. 399, 408, 447, 554 



and Archean, apparent gradation between 441 



and Negaunee, apparent gradation between 433 



deposition of 563-564 



described 409-444 



metamorpMsm of 441 



relations to Arche^ui 441-442 



relations to greenstone 425 



relations to Michigamme formation 452 



relations to Nec-iunee formation 334- 



335,433.437,439.420 

 iSee Goodrich quartzite.) 



Page. 

 Islands of Archean. {See Archean islands.) 



Islands in Lake Michigamme 456-457 



in Lake Superior 236 



Isoclinal folding 285- 



2S6, 308-312. 317, 327, 410, 421, 431. 568, 569 

 of griinerite-magnetite-schist. figure of 384 



Jackson. C. T., on geology of mineral lands of Mich- 

 igan 21 -22 



referred to 6.14,15,17,22,23,24,27.48 



Jackson Iron Company 15 



Jackson Location 22 



Jacksou mine 37, 



54, 74, 89, 90, 94, 125, 128, 142, 346, 360, 366, 

 396, 403, 410, 412. 427, 428, 433, 521, 569 



Jasper Bluff 356,358,380 



Jasper. (See Jaspilite.) 



Jasper- conglomerate 564 



Jasper-hematite-schist 90 



Jasperization of Xegaunee formation 404-405 



Jaspilite 72, 



79, 80, 81, 120. 127, 128, 223, 263. 312, 327. 334, 

 336, 344, 365. 366, 372. 379, 380, 382, 386, 390, 

 392, 394, 396, 499. 515, 542, 543, 550. 552, 544 



analysis of 363 



at Lake Superior mine 109 



banded with ore 577 



banding of 81 



concretion;iry stmcttire in 373 



contact with ores 81. 128 



dikes at Home mine 73 



described 362-364,371-572,375-376 



enlargement of quartz grains in lOO 



from cherty siderite 337 



from ferruginous chert 372 



from Grand Kapids mine, plate of 354 



from Jasper Bluff, plate of 356,358 



from Jackson mine, plate of 360 



from Lake Superior mine, plate of- 338 



fromnorthof Lowthian mine, plateof 360 



from siderite 451 



horses of 399 



in Animikie series 102-103 



in veins 268.291 



interbanded with ore 59 



layersin conglomerate 311 



Literature on : 



Brooks 59 



Crosby 68-69 



Irving 102-105,106-109 



Irving and Van Hise 100 



Julien 99 



PumpeUy 109 



Roniinger 90 



Van Hise 127,130,131 



Van Hise and Irving 100 



"Wads worth 73, 75, 79, 118-119, 127-128, 135-136, 138 



TThitney 99 



"Whitney and "Wadsworth 99 



WincheU.X.H 115 



name proposed 79 



of conglomerate 226,234,236.303.360.425.431,543 



of iron-bearing formation 298.530 



of Lower Marquette series 127.130.131 



of Penokee-Gogebic district 102-103 



