INDEX. 



5oV) 



Page. 



Midrik' Park district, rocks exposed in 110-111 



Milin]irc-« sccalicus 319 



Mill Creek Canyon; fossils from ." 46 



Millsap formation, section including 1-33 



MUlsap limestone, age and equivalents of 154, 



167, 169, 170, 1S6, 187, 209, 217 



character, extent, and thickness of 1-54, 162, 167-169 



fossils of 168, 169, 225, 226, 271, 276-279, 



285-286, 287-292, 294-303, 307-309, 315, 316-317 



Mis.sissippian faunas, consideration of 217-231 



separation of, into two groups 228 



Mississippian fossils, descriptions of 269-317 



mode of occurrence of 228-229 



table showing local occurrence of 230-231 



Mississippian series of rocks, formations composing .. " 209 



occurrence and character of 162-170 



Mitchell, Mary, acknowledgments to '. 9 



Modiola 433 



? nevadensis 308 



?subelliptica 248, 250, 251. 260, 308, 420 



waverlyensis 309 



^vi/omingcntiis 422 



Molas formation, age and equivalents of 194,212,263 



character and thickness of 124, 193-194, 246 



fossils of : 246-254,258-267, 



330, 333-334, 341-342, 344-345, 381-383, 403^07, 426 



Molas Lake, fossils from near 319-320 



Monarch district, fossils from 224 



Monilipora prosseri 236, 237. 247, 259, :S21-S2; 



Monnpteria alata 2.53, 4S1-432. oil, 



gibbosa 431 



var. ulata 431 



longispina 253, 4:)0-431 



marian 431 



polita 253, 430, 431, 432 



subalata 430, 431 



sp 430 



MQ7ioii!^ haiviii 427 



nidialvi 428 



Morrison, rocks exposed at 101. 1.S4-185 



Morrison formation, age of 205 



Mosquito Range, Carboniferous rocks m 178 



MuTchisonia lasaUensU 457 



marcouiana 4.57, 458 



nebraskensis 458 



terebra 457 



Myalina 199 



apachesi 426 



arkansa.sana? 21s. 219, '221 , 223. 225, 226. 231, :iO<-30!) 



aviculoidcs 423 



concava 422 



congeneris 309 



cunei formis 237, 260, 420-421', SIO 



exaspcratii 425 



kansasensis 423 



keokuk 218,231,309,/,i'6 



michiganensis 309 



perattenuata 253, 421, 425, 426 



(Myldits) pcraUenuata 42.i 



{Mytiluti) perattenuata 425 



permiana 422, 423 



perniformis? 247,251,260,426 



recur\irostris 35 



sanctiludovici 309 



subquadrata .... 42, 199, 247, 2.J1, 253, 260, 266, 424-425, 5i0 



swallowi 308, 309, 423 



wyomingensis 242, 248. 253, 260, 422-424, 425, 510 



sp 35, 42 



ISr. Pagr. 



Xaiadites 4(1 



elongatus 30.s 



Natica 102, 18."> 



altoncnah 46:'. 



lelia 102. 1 1 :; 



Naticopsis 102. ls."» 



altonensis 249. 251 , 2.53, 261 , 4(i»-464 



var. giganteus 46J 



monilifera 250, 251, 2.53, 261, 4(i4-!(i5 



nana I(ij 



remex ;'.'. !(;:; 



stibovttitis 411:; 



Seedle Miiuntains, Molas beds in 1 '.i.j. 19-1 



rocks exposed in , 123-121 



is'eedle Mountains quadrangle, fossils from, descrip- 

 tions of ; 330 



Molas formation in 2-Hl 



Neosho formation, equivalents of 265, 266 



Newberry, J. S., reference to 15, .52, 130 



Nodosiuella priscilla 269 



sp. 



269 



Xncula kazavcnmif 442 



[Lata) kazanensis 4 12 



parva 4f) 



ventrico.sa? 242, 260, 441 



sp 2 12, 260 



Xifndana bellistr/ala 46,442 



O. 



< lb(]lus ]U6, 111, 1.52 



( Lingulolla) 122 



Ogden quartzite, age of , -10, 41 



Oil Creek, rocks exposed «n lui 



Olcutt. E. E., reference to 14 



Olenus 



Ophileta as 



Oqiiirrh Mountains, Carboniferous rocks in 



Orbicula 



Orbiculoidea manhattanensis 212, 243, 2.59, S43- 



sp. 



233, 



Ordovician fossils, occurrence of 



Ordovician rocks, occurrcnceaud character of. 147-156, 211- 

 Orthis 8.5,86,87,90,149, 



arachnoidca 



I'arhmiaria 341, 



cirnistria 347, 



desmopleura luo, 



inequaliis 



lasaltensis 



pccosi 



pcrosll _ 344, 



_2}yaiten'i 



resupinoides 233, 



richmonda 



richmondi 



striatocostata 



vmbraculmn 



var. (/facUin 



vnT.pulclidln-'' : 



Oiihimia crassa .■. 



inissoitrt£nt>iK y. 



occidcntalis 



sftumardt'ana 350, 



umbraculmn f 



Orthoeeras 85, S6, 149, 152, 



cribro.sum 



sp 1 00, 



Orthonychla formosa ? 218, 231 .311 



1-52 

 ,160 

 201 

 62 

 -344 

 344 

 152 

 -212 

 165 

 347 

 345 

 348 

 152 

 276 

 348 

 315 

 345 

 348 

 346 

 318 

 348 

 850 

 347 

 276 

 276 

 347 

 350 

 3j0 

 351 

 348 

 165 

 46' 

 113 

 312 



