INDEX. 



593 



Page. 



Intrufsivi-.s in griinerito-magnetite'Sclust, figure of.. 330 



in iI:ir<iuetto series. 470. 487-514, 518-522, 555, 565, 571-572 



in Basemeiit Complex 554. 555, 5G5 



iu ^Ntigaunee formation. (See Greenstone in 

 Negaunee.) 



iu Northern Complex 188 



aeacribetl 178-186 



iu Ki-public trough 528, 5:J8 



in Siamo slate 323 



in Southern Complex 218 



(See Diabase, Diorite, Clarksburg series, Green- 

 stone, Igneous rocks.) 

 Iron carbonate. (See Siderite, Ferruginous rarbon- 

 ate.) 



Iron Clifls mine 115 



Iron ilountain 576 



Iron ore 330, :{7(;, 396, 413, 426, 547 



analysis of 21 



referred to 110,129 



and jasijer conglomerate 426, 429, 543, 579 



plate of 360 



at Cascade range 54 



at Champion mine 94-95 



at Cleveland mine 46 



at Eureka mine 85 



at Foster mine 45 



at Jackson mine 37, 75 



at Lake Superior mine 46, 72 



at Republic 23 



at Salisbury mine 75 



at "Washington mine 75 



concentration of 94-96, 132, 140, 317, 495 



contact with chlorite-schist 72 



described 364,374,375,415 



discovery of, in Lake Superior region 142 



from cherty siderite 337, 401-403 



from ferruginoua schist 75 



from siderite. 451 



hard gray 426 



horizons 391-392 



in Re^)ublic formation 145 



in Tipper Marriuette series 141 



in Cascade range 54 



interbanded with jasper 59.72,81 



literature on : 



Brooks 48, 49, 54, 59 



Burt 21 



Credner 45, 46 



Crosby 68-69 



Dana 61,146 



Foster 23.44 



Foster and AVhitney 27, 31, 32-33 



Goetz 128 



Gray 13 



Gresley 136 



Hunt 39,129 



Irving 102-103,106-109,113 



Julien 99 



Kimball 41-43 



Lane 140 



Lesley 38 



Locke 15, 22, 23 



Munroe 95-96, 97 



Newberry 61-62 



Payne 94, 95, 96 



Putnam 110 



MON XXVIII 38 



I'ago. 

 Iron ore— Continued. 



literature on — Continued. 



Rcyor 113-114 



Rivot 37 



Rominger 85, 86, 89, 90-91, 148 



Smock 99 



Smyth 145 



Van Hiso 126, 127, 130, 131. 132-133. 141 



Wadsworth 71-72, 



73-75, 78, 79-81, 119, 120, 127-128, 135-136, 139 



"SVinchell, H. V 142 



AVhitney 34,35-37 



"Whitney and Wadsworth 99 



AVhitney (see Foster). 



■Whittlesey 39 



magnetic 415,420 



metaaomatic changes in 102 



of Animikie series 102-103 



of basal conglomerate 360, 543, 548-549 



of Penokee-Gogebic district 102,103 



origin of 6, 



I 7, 32-33. 35-37, 39, 44, 61, 62, 71-72, 73-75. 78, 79-81, 



I 97, 99, 102-103, 106-109, 120, 113-114, 127-128, 129, 



i 131-132, 135-136, 139, 140, 146. 400-405. 551-553 



I pebbles in conglomerate 411 



I phosphoric acid in SO 



recoroposed 399 



replaced by silica 346 



replacing silica 380, 400, 403-404, 431 



specular 415 



varieties of 49 



(S'ee Flag ore, Hardore, Soft ore. Iron ore deposits.) 



Iron-ore deposits 322,329,379 



classes of 406 



concentration of 495, 510, 574 



cross-section of, at Edwards mine 96 



described 391-405,547-553 



development of 412, 435 



discovery of 5 



form of 131, 548 



grading into chlorite-schist 140 



grading into jasper 400 



horizontal section of, at Champion mine 95 



laws of occurrence of 131-133, 



400, 405, 406, 547-549, 552, 577 



of Republic trough described 547-553 



of Upper Marquette series 419 



origin of 400-405. 551-553 



(See Iron ores, origin of. ) 



plate of 394. 398 



position of (see Iron-ore deposits, laws of occur- 

 rence of). 



prospecting for 405-407 



relations to geological structure 549-551 



relations to Goodrich quartzite 396, 398, 399, 547 



relations to granite 547 



relations to greenstone 131,395,396,398,399,402 



relations to impervious troughs 400-401, 403, 406 



relations to jasper 398 



relations to Siamo slate 395. 398, 406 



relations to soaprock 394, 548, 550, 552 



plate of 546 



{See Iron ore.) 



Iron oxide, concretionary structure in 376 



from siderite 280, 562-563 



in veins (see Veins of iron oxide). 



