INDEX TO VOLUME 20 



745 



Page 



Newsom, Tennessee, View of quarry- 

 face showing disconformities 442 



Nevada, An old beach terrace in 707 



Nickles, - — - — , Reference to 530 



Nicolas, , Reference to general in- 

 dex of 431 



Nipigon basin, Post-Cretaceous geologic 



history of 222 



— • region, Character of the pre-existing 



topography of 219 



-, Date of denudation of 219 



— river, Gorge of the 202 



North America, Correlation of Middle 



and Upper Devonian and Missis- 

 sippian faunas of 703 



— — Continental seas of.... 446,480,481 

 .Catalogues of literature pertain- 

 ing to geology of 430-431 



. Emergences of 504-508 



■ — -and submergences, Table of... 499 



— ■ — • geologic formations. Classification 



into periods and eras of 513-600 



— — , Glacial invasion of 134 



— — , Paleogeography of 429-606 



— ■ — ■, Physical and faunal changes of 



Pennsylvania^ and Permian in... 703 

 . Physical and faunal evolution of. 703 



— — .Regional movements of.... 500-503 

 — ■ — .Revision of Paleozoic svstem in. 659 



, Table of inundations of 601 



, Tertiary drainage problems of 



eastern 668 



— ■ — .Transgressions and Invasions of. 



508-510 

 — ■ Carolina and Virginia • Cretaceous 



floras, Geologic relations of 655 



■ , Erosion intervals in the 



Tertiary of 673 



Norton, W. H., Reference to 400 



Norwegian marbles and dolomites. . . . 168 



Ocean. Changes in chemical condition 



of 157 



— , Estimated age of 157 



— , The pre-Cambrian a fresh water... 170 



— water, Composition and changing 



of 153-154 



Oceanic level. No such condition as... 



512, 513 



Ohern, D. W., Reference to 681 



Ohio coal beds, Duration of 336 



Officers. Correspondents, and Fellows, 



List of 721-733 



— for 1909. Election of 616 



Ojibwa lake. Last of great glacial lakes. 639 

 Oklahoma red beds, Present knowledge 



of 700 



Ombabika narrows. Diabase sheets in.. 206 

 Oolites, "Eggs" of the Belt-Cambrian. 168 

 Ore deposits of Silver Peak quadrangle, 



Reference to 225 



Ordovician limestones, Canada and 



United States 164 



— sediments. Composition of 243 



of Silver Peak quadrangle 243 



Orographic origin. Valleys of Silver 



Peak region of 263 



Ortmann. , Reference to 434 



Orton. Edward. Jr.. The Mills moraine 

 and glacial drainage of Longs Peak 



(Colorado) district 671 



Osborne. Henry Fairfield, Environ- 

 ment and relations of the Cenozoic 



mammalia 704 



— , Reference to 354, 356, 582, 600 



Oscillatory seas. Strand-lines and 511, 512 



Ostwald, . Reference to. 386,388,390 



Ottawa and other rivers, Comparison 



of 160 



Page 



Ottawa river, Analyses of 157 



— ■ — , Largest pre-Cambrian area 



drained by 158 



Ouachita region, Geologic history of.. 646 

 Owen, Richard, Reference to Mylodon 



rubuslus by 353 



Pacific coast Tertiary faunas, Envi- 

 ronment of 704 



Paleogeographic maps of North Amer- 

 ica, Description of 513-600 



Paleogeography, Areal-geologic method 



of 446 



— , Classification of methods of 437 



— , Definition of 431 



— -, Diastrophic method 447 



— , Historv of 431-436 



— , Methods v of 437-447 



— of North America, by Charles Schuch- 



ert 429-606 



— , Paleontologic method of 437-446 



— , Petrologic method of 446 



— .Robert Etheridge introduced term. 431 

 Paleontological Society, Committee 



appointed for organizing 660 



Paleontology. Bibliography of Brazil. 



1-132 

 Paleozoic, Early and middle 703 



— era, Acadic period of 520-522 



— — , Canadic period of 526-529 



, Cincinnatic period of 530-532 



— — of Silver Peak quadrangle.. 238-239 

 — -emergences and submergences 479 



— formations, Limestones and dolo- 



mites of early 155 



— — •, Georgic period of 516—520 



, Ordovicic period of 529-530 



— — , Ozarkic period of 522-524 



— — , Periods of 516-532 



— lands, or positive elements.... 464-475 

 — ■ limestones and dolomites. Origin of 



early . 163 



— locality. Cincinnati region 445 



— ■ positive elements, Geographic names 



of 467-475 



. Map of 464 



— ■ system in North America, Revision 



of 659 



— ■ sedimentarv series of Silver Peak 



quadrangle 238-243 



— time. Dana cited on 515 



, Map of seas of 446 



Palmetto mountains, Rhyolite tuffs at 



base of 229 



Pallister. H. D.. Reference to 627 



Parameters, Law of the rationalitv 



of 387. 390. 393 



Patton. H. B., Reference to 661 



Peale. A. C. Reference to 546 



Peat beds of Aftonian stage in Iowa. . 



399. 400 

 — • — ■ — Iowa, The Oelwein and Afto- 

 nian 139 



— ■ deposits. Lower Sacramento and San 



Joaquin rivers 707 



Pele. 1902-1903 eruptions of mount.. 



409-426 

 Penck, Albrecht, Paper on intergla- 



cial epochs, by 633 



— , Reference to 633, 637, 638, 659. 670 



Pennsylvania coal area, Number of 



acres remaining in 335 



Pennsylvanic Permic formations, 



Table of 558 



— ■ time, Reference to 439 



Peorian interval 148-149 



Petrography. Use of "Ophitic" and re- 

 lated terms in 661 



