INDEX. 



491 



Page. 



Augite alterins to xiralite lOi, 201, 212 



cleavage of 2^7 



crystallization of 257 



of amphibole-peridotite 255 



of gabbro and norite 237 



of horubleiide-gabbro 243 



of metabasalt 100,104.211 



of metatlolerite - 200,201 



of peridotite 250 



of tufls 138 



in dolomite 436 



included in hornblende 237, 250, 255, 257 



including biotite - 250 



including hornblende 250, 255 



including hypersthene 255 



zonal intergrowth with hornblende, jdate of 320 



zonal intergrowth with olivine and hornblende- 255-260 



Augite-andesite of Hemlock formation 108 



Ausweichungs-clivage. (See Pyroxene) 440 



B. 



Bad A\^ater village 374 



Balsam village 143 



Banding of acid lavas 87,88,91,92 



described 93,94 



of acid pyroclastics 95 



of Archean granite 49 



of ash bed 143 



of biotite and chlorite 225 



of biotite-granite 43-44 



of biotite-schist 467,468 



of Bone Lake crystallnie schist 149 



of chert of Mansfield mine 69 



of gneiss 390 



of granite 45.49 



of greenstone 485-487 



of Groveland formation 417-418 



of hornblende-schist 465, 406 



of Mansfield schist 413 



of mica-gneiss 197 



of q uartzite 401 



of Randville dolomite 409 



of rhyolite-porphyry 81 



of spilosite-desmosite, plate of 306 



of Sturgeon formation 431 



of tufi' .. 138 



of volcanic conglomerate 144 



Barrois, Charles, referred to 44 



Basalt. (See Metabasalt.) 



Bascom, F., ou devitrified lavas 80, 87. 96 



Base level. {See Peneplain.) 



Basement Complex of Sturgeon Kiver tongue de- 

 scribed (see Archean) 463-471 



Basic intrusives described 198-212 



age of 48,49 



correlation of 189 



effect on topography, sketch of 46 



in Archean 49 



in Felch Mountain range 446 



in Hemlock formation 77 



described 204 



in Mansfield slate described 203-204 



in other intrusives described 204 



in Upper Huronian 164, 211 



described 204 



metamorphism of Mansfield slate described 204^211 



95-148 

 106, 264 



XV, 22 

 XVI, 12 



Page. 



Basic intrusives, schistosity of 47-48 



transfer of material to elate 211 



Basic lavas described - - 95-135 



Basic volcanics, alteration of 152 



described 



Bassett, V. H., indebtedness to 



Bayley, W. S., indebtedness to 



on Clarksburg formation 



on metamorphism of basic volcanics 



on schistose pyroclastics 



referred to 



Bebb, E. C., indebtedness to 



Becke, F.,on granodiorite 231 



on relations of pyroxene and amphibole 258 



on tonalite 230-231 



on tonalite-porphyrite 229 



referred to 1 05 



Bedding of Upper Huronian 167 



Benson, Vt., analysis slate from 61 



Bessemer ore of Mansfield mine 08 



of Mansfield slate 27 



Biotite, alteration of 43, 393 



altering to calcite 192, 225 



to chlorite. 43, 47, 192, 103, 215, 216, 225, 228, 248, 403, 425 



to epidote 43 



to epidote-zoisite 225 • 



to rutile 43, 192.202,225 



to sagcnite 192,193 



to aphene 192,225 



banding with chlorite 225 



crystallization of 258 



from feldspar 42,82,89,90,92,150,170.192,201 



included in augite , 250 



included in feldspar 151, 171 



included in hornblende 251,260,261 



included in muscovite 298 



inchuled in quartz 47,171,394,403,466 



included in plagioclase 193,484 



including apatite 217, 234, 239 



including epidoto 225, 226 



including ilmenite 216 



including iron oxide 252 



including sagenite 403 



including spbene 225. 404 



including zircon 234 



intergrown with muscovite 393, 414 



t of acid lavas 89, 01 



of amphibolite 296 



i of amphibole-peridotite 254,258 



I of amphibole-schist 466 



I of amygdules 124 



of basic dikes 47 



I of biotite-granite 42, 43. 192, 193 



of biotite-schist 468, 484 



of Bone Lake crystalline schist 150 



of diorite 225 



of gabbro and norite 234 



of granite 198 



of graywacke 170 



of greenstone 486 



of Hemlock schist 444 



of metadolerite 202 



of metamorphosed Mansfield slate 205 



of mica-diorite, plate of 308 



of raica-achist 392,393 



of muscovite-biotite-gneiss. plate of 298 



