512 



INDEX. 



Van Hise, C. R., on silicification of ore formation on 134 



Sturgeon River conglomerate 461 



Van Horn, F. R., on norites 235, 247 



Van "Werveke, on spilosites 206 



Tariolite in metabasalt described .' 108-111 



plate of 110 



of Point Bonita 108 



Veins of iron oxide in Groveland formation 449 



of pegmatite in greenstone 476 



of quartz 14 



in Grroveland formation 185, 449 



inRandville formation 435 



Volcanic ashes altering to greenstone 487 



Volcanic breccias, use of term 137 



Volcanic elastics, plate of 284 



Volcanic cones in Hemlock formation 78 



Volcanic conglomerate described 143-145 



use of term 136 



Volcanic rocks of Crystal Falls district xx, 95-148 



of Hawaii 75 



of Iceland 75 



of Penokee district xxi 



(See Hemlock formation.) 



Volcanic sand, plate of 296 



Volcanic sedimentary rocks of Hemlock formation 



described 136-145 



Vulcan iron formation, correlated xx v, xxvi 



W. 



"Wadsworth, M. E,, on the iron, gold, and copper dis- 

 tricts of Michigan 20 



on dike in Paint River mine 183 



on Felch Mountain range 381 



on Mesnard series 452 



on Upper Huronian conglomerate 166 



referred to 95 



Washington, H. S., on zonal structure in olivine 258 



"Wauuetamine. (^ee Hope mine.) 



"Weathering of araygdules 125 



of biotite ,. 202 



of Mansfield slate 205 



of metabasalt 134, 135 



of metadolerite 199-200 



Weidman, S., referred to 22 



Wehrlite described 253 



plate of 320, 322 



analysis of 259, 263-264 



gradation to amphlbole-peridotite described 254-260 



(^eePeridotite.) 



Wewe slate, correlation of xxv, xxvi 



Whin Sill..... 211 



Whitney, J. D. (See Foster, J. W.) 



Wichmann, Arthur, on iron-bearing rocks south of 



Lake Superior 21 



on serpentine 253 



on Upper Huronian rocks 173,174 



Williams, G.H., on alteration of ilmenite 202 



on Cortlandt series 222 



on Cortlandite 254 



on ellipsoidal structure 118,119 



on gabbros 247 



on micropoikilitic texture 84,85,87 



on production of schists from igneous elastics. . 152 



on pyroclastics of Marquette district 148 



on pyroxene zone about olivine 256 



on ultrabasic intrusi ves 220 



referred to 95 



Wincbell, N. H., on ellipsoidal structure 118-119 



Wolff, J. E., on Hoosac schists 394 



on development of mica 130 



Wright, C.E., on Crystal Falls district 20 



on garuetiferous mica-schist 196 



on granite dikes in iron-bearing formation 381 



on Menominee iron region 21 



on staurolitiferous mica-schists 196 



on Upper Huronian 173-174 



referred to 21 



T. 



Toungstown mine 182, 186 



location of 178, op. 186 



table of shipments from op. 186 



Z. 



Zircon included in biotite 234 



of gabbro and norite 239 



of rhyolite-porpbyry 81 



Zirkel, F.,onrock nomenclature 97 



on spilosites 206 



on transfer of material from basic intrusives 211 



Zoisite from feldspar 201 



plate of 286 



included in epidote 445 



of metabasalt 101,117 



Zonal structure in amygdules 124 



in epidote-zoisite 101 



in feldspar 193, 194, 197, 233 



in hornblende 226, 234, 235, 236, 256 



in metabasalt 117 



in olivine 259 , 



in pyroclastics 146 



in tuff 141,142 



c 



