560 



INDEX. 



Page. 



Morton.Dr. S. G., describes fossil TTniones. 478 



Mount Houghton, Keweenaw Point, Mich . 114 



, , , Felaiteof 130 



Murray, Alexander, on the Huronian of 



Lake Huron and Lake Superior 163, 169, 171 



Myalina subquadrata 270 



Mytilidce 423 



Naiadites carbonaria 425 



dongata 425 



leevis 425 



National Museum, Continued courtesies 



of the xvii 



Neritidaj 457 



Neritina bannisteri 458 



bruneri 459 



naticiformis 458 



nebrascensis 457 



(Velatella) baptista 458 



bellatula 458 



carditoides 458 



volvilineata 458 



Nevada limestone 264 



, Map of northern and central xvi 



, Niagara, limestone in 263 



, "Workin xvi 



New investigations xv 



Newberry, Dr. J. S., cited 331, 336, 339, 343 



Newman, G. Olivio, Services performed 



by 243 



Niagara limestone in Nevada 263 



Nipigon Bay, Canada 126, 177 



, Thickness of Keweenawan rocks 



of 137 



Straits, Canada 129 



Nonesuch belt, Mich 180 



cupriferous sandstone 185 



silver-bearing sandstone 139 



North shore of Lake Superior, Distribu- 

 tion of Keweenawan rocks 



on 143 



, Distribution of rocks on ... 141 



, Great exposures on 140 



, Keweenawan rocks on 140 



, Scenic characteristics of 140 



Norwood, Dr. J. G., cited 385 



, , on the geology of the Min- 

 nesota coastof Lake Superior. 118, 121, 124, 143, 



158, 164 



Numakagan Lake, Wisconsin 134, 165, 175 



Oboletta discoidea 259,261 



OdontolccB 50,86 



Odontornithes, Geologic horizon of 50 



Odontotormce 50, 69, 86 



Office of the Survey, Location of the xvii 



work, Synopsis of xv 



Ogyffia problematica 258 



spinosa 258 



Old Suffolk mine, Keweenaw Point 113 



Oldest known birds 49 



Olenellus abnormig 256 



barrandi 256 



iddingri 256 



thompsoni 257 



vermontana 257 



-shales 256,257 



Page. 

 Oli vine - diabase of Kewienaw Series 



described 102,107 



Olivine-free diabase of Keweenaw Series 



described 106 



Olivine - gabbro of Keweenaw Series 



described 102 



Olivino in basalt 285,286 



, Relation of, to silica in basalt 286 



Ontouagon River, Mich 130, 134, 136, 151 



Oquirrh Range, Age of 256 



Ore deposits of Eureka District, Study of xvi 



Origin of birds 86 



peculiar features of Hesperornis 65 



vertebral forms 79 



Original rocks of Keweenaw Series, Sum- 

 mary view of 114 



Orographic movements, Post-Lahoiitan . . 232 



probably in progress in the Great 



Basin *232 



Orthis eurekensis 258 



macfarleni 265 



pecosi 270 



perveta 261 



testudinaria 261 



tricenaria 261 



tulliensis 266 



Orthoclase-free diabase of Keweenaw 



Series described 102 



Orthoclase-gabbro of Keweeuaw Scries 



described 104 



Orton.E., cited 339,340 



Osars 299 



Ostrea glabra 421 



subtrigonalis 421 



Ostreida? 420 



Owen, D.D., referred to 147,174 



Paleozoic formations in the Eureka Dis- 

 trict 248 



Palisade Creek, Minn 126 



Papers accompanying the Director's 



report 43 



Paracydas occidentalis 266 



Pelvic arch of Hesperornis CO 



Ichthyornis 75 



Penokee Huronian, Similarity of, to Ani- 



mikie group 158 



Iron Range, Wis 165 



Petit Marais, Minn 143 



PhUlipsia (sp. ?) 269 



Physa bridgerensis 450 



carletoni 449 



copei 450 



felix 450 



pleromatis 450 



secalina 450 



Physidso 449 



Pic River, Canada 177 



Pigeon Point, Minn., Animikie rocks of.. 141, 158 

 .Dikesof 158 



River, Minn 117,126,130,137 



Pifion Range, Devonian limestone of 267 



Pinto fault 289 



, Volcanic rocks of 280 



Peak, Altitude of 246 



, Rhyoliteof 279,282 



