502 



INDEX. 



Page. 



Menominee Eiver 175, 335, 374, 375, 460 



described 32,334 



Henominee series of Sturgeon River 462 



ilerriam, TV. N., indebtedness to 12 



on dike at Glidden exploration 183 



magnetic lines traced by 12 



referred to x v, xxvi, 22 



sketch of folding of Upper Huronian 179 



Merrill, G-.P., on ultrabasic intrusives 220 



Mesnard qnartzite of Marquette district 452 



correlation of xxv, xxvi 



Mesabi cbert, resemblance to Groveland quartzite. . 422, 423 



Mesabi iron-beariug formation, origin of 422 



Mesqua-cum-a-cum-sepe (river) 15 



Metabasalt described 98-135 



alteration of 126-135 



amygdaloidal, plate of 280, 282, 284, 290 



analyses of 103, 106, 107 



carbonation of 132, 133, 134 



conglomerate of Upper Huronian 163 



devitrification of 102, 103, 126 



ellipsoidal, described 112-124 



figure of 112,113,114 



plate of 116,292 



matrix of, described 114-118 



plate of 284,298 



eutaxitic texture in 103 



fiow structure in, plate of 280 



fragments in volcanic sand, plate of 296 



grading into dolerite 200 



intrusives described 211-212 



perlitic parting in, plate of 294 



road material 154 



silicificatiou of 133,134 



spherulitic 98, 108 



texture of, plate of 280, 286, 288, 290, 294 



use of term 96, 97, 98 



variolitic, described 108-111 



plate of 110 



weathering of 1 34-135 



Metadiabase, tise of term 96, 97 



Metadolerite, described 199-204 



analysis of 203 



distribution of 199 



relations to Hemlock volcanics 204 



relations to Mansfield slates 203, 204 



relations to other intrusives 204 



relations to Upper Huronian 204 



use of terra 96, 97 



Metamorphism of Archean xviii 



of Crystal Falls series xxiii, xxiv, xxv, xxvi 



of Hemlock formation xxiv, 446 



of quartzite 425 -426 



of Upper Huronian 28,425-426 



{See Alteration.) 



Method of location of ledges 23 



Methods of mining 184,185 



Methods of work of Lake Superior Division 22, 23, 24 



Metropolitan mine, granite dike at 381 



Mica, from feldspar 169, 170 



included in microcline 394 



of acid lavas '. 89, 91 



of biotite-granite 43-192 



of granite 198,388,464 



of Hemlock schist 444 



of hornblende-gabbro 243 



Mica of hornblende-schist 465, 485 



of Mansfield slate 205 



of mica-schist 414 



of quartzite 425 



orientation of 43, 44, 89, 91, 198, 387, 388 



Mica-diorite 226 



analysis of 231, 263, 2C4 



comparison with monzonite 232 



ophitic texture in, plate of 308 



Mica-gneiss, developed by intrusion 195, 197 



from basic volcanics 152 



of graywacke 170 



of Upper Huronian 166, 167, 171, 173, 173 



pressure eflects in 171 



Mica-schist described „ 392-395, 423-426 



analyses of 394 



developed by intrusion 195,196 



from basic volcanics 152 



intruded by amphibolite 392 



intruded by pegmatite 392 



of Archean, described 392-395 



of Felch Mountain range, described 423, 426 



of gray wacke 170 



of Mansfield schist 413 



of Upper Huronian 166, 167, 171, 172, 173, 174, 425 



pressure effects in 171 



relations to Eaudville dolomite 392 



relations to Sturgeon quartzite 392 



Mica-slate described 15 



distribution of 14, 15 



of Mansfield formation 439 



Mica-titanite included in dolomite 436 



Michel-Levy on method of feldspar measurement- . . 104, 224 



on ophitic texture 20O 



on texture of rhy olite-porphy ry 81, 85, 105 



Michigamme dam 55 



formation, correlation of xxv, xxvi, 28, 165 



replaced by Clarksburg volcanics xxvi 



Michigamme jasper, magnetic observations in 339 



Michigamme Mountain xx, 56, 446, 447, 448 



analyses of dolomites from 435 



elevation of 333 



slate of 56 



Michigamme Mountain area described 427-450 



Michigamme Eiver 16, 



21, 54, 65, 15G, 161, 163, 164, 166, 167,173, 

 174, 187, 190, 194, 203, 204, 205, 240, 241, 243, 

 245, 249, 253, 329, 330, 331, 333, 411, 432, 438 



described 31,334,335 



course of 54, 55 



changing channel of 56 



Michigan Exploring Co. {See Michigan mine.) 



Michigan mine 157 



location of op. 186 



table of shipments from op. 186 



Microcline, including feldspar 394 



including magnetite 394 



including mica 394 



including quartz 393, 403 



of biolite-granite 41,42 



of diorite 225 



of mica-schist 394, 414 



of quartz-mica-diorite 228 



orientation of 294 



Microgranitic texture 83 



described 86, 87 



