498 



INDEX. 



Hemlock formation, pryoclastics of, plate of 140 



relations to iutruaivea 77,204 



relations to Mansfield formation xx, xxi, xxvi,64, 76 



relations to Grovelaiid formation ss, xsi, xxvi, 447 



rslations to Kandville dolomite xx, 75 



relations to Upper Huronian 77 



rhjolite-porphyry of. described 81-87 



sedimentaries of, described 152, 153 



thickness of xvil,27.74,75,441 



topography of 73. 74, 440. 441 



Hemlock mine 157, 177 



analysis of ore from -^ 181 



diamond drill work at, figure of 177 



exploitation of ore deposits at - 175 



location of Op. 186 



table of shipments from Op. 186 



Hemlock Eiver described 31 



Hesse-Darmstadt, -webrlite from 219 



Hillebrand, "SV. F., analysis by 61 



Hobbs, Wm. H., on metamorphism of schists 130 



Hollister mine, location of 178, Op. 186 



Holy oke formation 20 



Hoosau schists of western Massachusetts 394 



Hope mine, location of 178, Op. 186 



table of shipments from Op. 186 



Horizontal needle, deflection of, figure of 345 



Hornblende, alteration of 234-235 



altering to actinolite 215 



altering to calcile 203, 215 



altering to chlorite 100, 203, 214, 215, 237 



altering to opidote 100,203,237 



altering to magnetite 215 



crystallization of 257,258,259 



from augite 100,201 



grading into hornblende 241, 245, 251 



plate of 312 



included in augite 255 



included in feldspar 151, 484 



included in quartz 466 



including anatase 236 



including augite 250,255,257 



including biotite 251,260,261 



including brouzite 250 



plate of 306 



including epidote 47 



including feUlspar 235, 241 



plate of 312 



including ilmenite 236,246 



including iron oxide 47,215,251,487 



including malacolite 238 



includin j: olivine 251, 257, 260 



including pyroxene 237, 241, 245, 251, 260 



plate of 312 



including quartz 47 



including rutile 236, 239, 248 



including spinel 236 



inclusions in 240,245,248,260 



l)lateof 318 



intergrown with augite, plate of 320 



intergrown with augite and olivine 255-260 



intergrown "with bronzite, plate of 318 



intergrown with feldspar 256 



plate of 322 



intergrown with pyroxene 251, 260 



plate of 320 



intergrown with spinel 256 



Page, 



Hornblende of amphibolite 396 



of amphibole-peridotite 253, 258 



of arkose 479 



of basic dike 47 



of biotite sranite 192 



of Bone Lake schists 150 



of bronzite-norite-porphyry 246 



of diorite 226 



ofgabbro 234,237,248 



of greenstone 470, 483, 486 



of hornblendegabbro 240, 241, 243, 245 



plate of 312 



of hornblende-gneiss 174, 465 



of Hemlock schist 445 



of metabasalt 100 



of metadolerite 200, 202, 203 



ofperidotile 251,252,257,260 



of picrite-porphyry 215 



of tuff 141,142,145 



of volcanic conglomerate 145 



of volcanic sand, plate of 296 



orientation of 174,214,215,395,396,465 



penetrated by feldspar, plate of. 322 



phenocrysts in Bone Lake schists 150 



pressure effects in 237 



relations of orientation to biotite 486 



zonal structure in 2-:6, 234, 235. 236, 256 



(See Hornblende intergrowth.) 



Hornblende-gabbro described 240-244 



plate of 312,314,316,318 



analyses of 242, 263-264 



crystallization of minerals of 262 



intruded by bronziie-ncrite 243, 249, 2G5 



intruded by diorite 265 



intruded by gabbro 265 



intruded by peridotite 246, 260, 265 



Hornblende-gneiss of Archean described 395-397 



intrusive in Upper Huronian 167, 173, 174, 175 



pressure effects in 175 



Hornblende-schists from diabase 466 



from gabbro 466 



intrusive in Sturgeon Eiver Algonkian 485 



of Archean of Sturgeon River 465^67 



of Upper Huronian 173 



Hornblende-slate described 14 



distribution of 13-14 



Hubbard, Bela, on Sturgeon River tongue 459, 461 



Hulst, N. P., on composition of ore deposits 69 



Huron Mining Co. {See Columbia mine.) 



Huronian rocks, correlation of xxv, XXVI 



distribution of, plate of 160 



erosion of xxiv 



folding of XXII, 25, 163 



metamorphism of xxiii 



relations to Archean 39, 378, 379, 380, 4L0 



relations to Cambrian xxi v, 28 



succession xxv, xxvi 



unconformity within xxvii 



(See Algonkian, Upper Huronian, Lower Huronian.) 



Hutchings, "W. Maynard, analyses by 59 



on composition of clay 60 



on spilosites 206 



on transfer of material from basic intrusive " 211 



Hy alopilitic texture in metabasalt 98, 99, 104 



Hypersthene included in augite 255 



Hypidiomorpbic texture in gabbro 233 



