592 



INDEX. 



Page. 

 Hobbs, "SV. H., on barite, magnatite, and cLloritoid 



in Marquette rocka I'lS 



referred to ^O-* 



Holyoke formation l"*-* 



unconforiuitv with Republic formation 128.135- 



136, 137, 138-139 



Bome mine 73, 89 



Hornblende and griinerite intergrown . . 388. 390, 419, 423, 436 



crj'stals in mica-schist 323, 324 



fromsiderite 419,422 



of bio tite -granite 1"2 



of biotite-achist 322 



of biotiteslat© 384 



of chlorite-schist 513 



of conglomerate 479.480,527,533 



of diorite 178,181 



of epidiorite ^^^ 



of granite 526 



of graywacke 304 



of greenstone ^^5, 



466, 467, 492, 493, 496, 498, 502, 538 



of greenstone-acbist 205 



of griinerite-magnetite-schist 368, 369 



of griinerite -rock 387 



of hornblende- schist *'^6 



of hornblende-syenite 177 



of Marquette formations 5"^ 



of mica-gneiss 450 



of Mona schists 155. 157, 158, 164 



of novaculite 304 



of quartz -diabase 



of quartzite 



of slate 



(See Amphibole.) 



Hornblende-rock, origin of 



dikes in granite 83 



Hornbleude-scbist 98,152,206,219,527 



associated with Marquette fragmentals 503 



in Clarksburg aeries 475-476. 477, 482 



in Republic formation 139 



origin of 84,102.103-104,140 



in Mount Alban series 66 



relations to granite 83-84 



{See Amphibole-schist, Actinolite-schist, Griine- 

 rite-schist.) 



Hornblende- slate 11,20 



Hornblende-syenite described 176-178 



in Northern Complex 151, 176-177 



relations to adjacent rocks 176 



Hornbleudic biotite- schist in Southern Complex 198 



granite 10 



mica-gneisain Southern Complex 195 



schist 422 



in Southern Complex 192, 201, 203-208 



amphibole-schist 204-206 



greenstone-schist 204-206 



micaceous amphibole-schist ^ - - - 208 



origin of 208 



Horses of jasper 399 



Hinigbton, Douglass, on geology of Upper Peninsula 



ofilichigan 9-11 



on geology of the vicinity of Marquette 59 



referredto 6,12,17,19,39,72.76 



Hubbard, Bela. on geology of Marqaetle district 18-19 



referredto 6,16,17,71,72.48 



Humboldt 283, 



284, 331, 333. 338, 385, 389, 409. 410. 412, 433, 434. 444, 561, 572 



Page. 



Humboldt mine 129, 386, 412. 433 



Humboldt Mountain 338, 503, 507, 513 



Hunt, T. S., analysis by 202 



on alteration of Marquette rocks 71 



on Azoic system 66 



on origin and age of iron ore 129 



on position of ore 39 



jiroposal of name Keweenawan by 63 



referred to 6, 7, 40, 47, 63, 64, 71, 72, 77 



Huron Bay 92 



Huron Lake. {See Lake Huron.) 



Huron Mountains 40 



Hnronian 48, 61, 63, 71, 75, 76, 78, 82, 105, 109, 129, 134, 146 



Huronian areas 101 



Hnronian formations 142 



(See Huronian series, Huronian rocks.) 



Huronian granite 63 



Huronian group 110-112 



(See Huronian series.) 



Huronian rocka 55, 133 



catalogue of 58 



classification of 64 



origin of 98 



422. 444 



84^5 



relative ages of 54 



C5t>e Huronian series.) 



Huronian series 39, 44-45, 55-56. 65, 134, 147 



and copper-bearing series, comparison of 63 



comparison with copper-bearing series 63 



correlation between Marquette and Canadian. . . 117 



components of 65-66, 135 



relations to granite 82 



relations to Mount Alban series 66 



structure of 98 



succession in 64-66, 67 



two series in 126 



(See Algonkian Animikie aeries, Huronian formation, 

 Hnronian Group, Huronian rocka, Marquette series.) 



Hydromica-schist, Irving on 103-104 



Igneous rocks: 



basalt 



bosses of, in Marquette series 489-499, 



described 



dikes of 



in Huronian aeriea 



oliviue-diabaae 507, 



porpbyrite 



po&t-Clarksburg greenstone 



pre-Clarksburg greenstone 



quartz-diabase 507, 



sheets of 514, 



tuffs of 



{See Diabase. Diorite, Clarksburg series. Green- 

 atone Intrusives.) 



Ilmenite in Mona schists 



Inter-Marquette erosion 376. 384, 



Interbanding of Clarksburg rocks 



of greenstones and sedimentaries 



Intergrowtbs of hornblende and griinerite. {See 



HombU-ndc or Griinerite.) 

 Intermediate rocks, bosses of, in Xorthern Complex. 



dikes of, in Northern Complex 



Interraount trough 



International Congress of Geologists 



lutrusive character of greenstone in Marquette 

 series 489-490, 



507. 522 

 499-506 

 487-524 

 506-514 

 65 

 520-521 

 521-522 

 518-522 

 488-518 

 519-520 

 515-517 

 514, 517 



387. 392 

 482, 4&4 



