604 



INDEX. 



Page. 



Sericite-slate 290, 304 



pebbles in conjjlomerate 413 



Serpentine 10, 1 16 



analysis of 164 



at Presqne Isle 9, 60, 



67, 70. 76, 77, 93, 99, 100, 103, 120, 128, 139 

 (.SeePeridotite.) 



ShiUc 260,408.444,453,560 



alteration of 579 



carbouaceotis 50. 67 



Sharpless, F. F., referred to 148,512 



{See Lane, A. C) 



Sbear zones in biotit«-granite 174 



in greenstone 491 



in porphyrite 521 



Shearing between Upper and Lower Marq^aette 405 



of Lower Marquette series 534 



of Mesnard formation 227, 231 



planes in cberty sideiite 340 



in quartz grains 415 



in slate 262.269 



Sheet-greenstones in Marquette series 500, 



507, 514-517, 522. 523 



composition of 516-517 



amygdaloidal 516-517 



Siamo bills 313,314,324,326,327 



Siamo slate 221, 283, 284, 293, 299, 312, 332. 333, 336, 



367, 377, 384, 388, 392, 394, 407, 554, 562, 569, 572 



deposition of 561 



described 313-328 



intrusive greenstone in 323 



minor overturned fold in, figure of 315 



overtbrust fault in. plate of 280 



pitching fold in, plate of 570 



plateof 280 



relations to Ajibik quartzite 2S9, 300, 321 



relations to grunerite-magnetite-scbist 369 



relations to jasper 328 



relations to Negaiinee formation 321 



322, 325, 327, 333. 334, 378-379 



relations to ore deposits 395, 406 



relations of scbistosity and bedding in, figure of. 315 



Siderite 130,133,327,408.419,423 



idteration of 280 



{See Alteration of siderite.) 



of ferruginous chert 325 



of ferraginous schist 107 



of graywacke 446 



of siderite -slate 367 



of slate 446,450 



origin of 561 



residual 371,381,401,419,422 



(See Ferruginous carbonate.) 



Sideritcslate 380, 450 



alteration of 446, 454 



cberty. (See Cberty siderite-slate.) 



Siderittc slate, alteration of 361 



analyses of 337 



described 336 



veins in Northern Complex 187 



Silica (cberty) of siderite-slate 367 



of ferruginous cbert 370 



of griinerite-magnetite-schist 369 



of iron-bearing formation 576 



replaced by ore 346,348,394,403-404 



(5« Cbert quartz.) 



Page. 



Silicates, almuinons. in iron ores 91 



Silicification of carbonate-bearing-schist 1U8-109 



of Kitcbi schists 166 



of sandstone 100,104 



Silver Lake 161 



Slate 92, 224, 231, 233, 235, 236. 237, 238, 242, 244, 



247,251, 253, 254, 269,271, 276, 277, 278, 282, 287, 292, 

 293. 304, 306, 307, 309, 445, 452, 454, 559, 576, 577, 579 



analysis of 202 



arenaceous 20 



black 127, 133 



carbon of 273 



carbonaceous, analyses of 446 



composition of 201. 202 



described 232, 446 



in dikes 49 



iron pyrites in 273 



in Clarksburg series 460,483 



of ferruginous slate 369 



of Menominee district 576 



relations to Kortbem slates 578 



of Upper Marquette 571 



passes into mica-slate 266, 325 



pressure efiects in. (See Pressure efiects, Cleav- 

 age Fissility, Scbistosity.) 



sideritic 334 



veins in Xortbem Complex 186, 187 



(See Argillite, Argillitic slate, Claj' slate, green 

 slate, hornblende-slate, talcose slate, Siamo 

 slate, "Wewe slate, Michigamme slate.) 



Slate-breccia 263, 282 



Slate-conglomerate 259. 263 



described 264, 266, 271 



relations to slate and graywacke 266 



Slat«ore 364,404.405,547.549-550 



described 375 



Slickensides in jaspilite 376 



instate 317 



Smiths Bay 145. 526. 538 



(See Republic.) 



Smock, J. C., on position of Marquette ores 99 



Smytb, H. L., on contact between Lower Huronian 



and Basement Complex 143 



on quartzite tongue at Republic _ 144-145 



on Republic trougb 525-552 



referred to 2,7,437,576-578 



Soapstone 116, 131, 



132, 392, 395, 396, 399, 403, 487, 490, 506, 510, 511. 512, 513 



at Jackson mine &4 



from greenstone 396.399,538 



grading into greenstone 394 



relations to ore deposits 394, 548, 550, 552 



Soft ore 67,364 



origin of 75,78,120,131-132,133,139 



Soft ore jasper 318, 362, 392 



Sonlbem Complex 225, 554 



described 190-220 



comparison witb Northern Complex 192, 218-219 



intrusivesin 217.218 



relations to Mesnard quartzite 567 



veins in 217 



Specular bemat ite ore 549-550 



Specular jasper 392, 539 



Specular ore 415, 436 



Spbeno of epidiorite 181 



of hornblende -svenite 177 



