446 



BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



Mountain-glacier erosion 130 



Mountain Lake mine, Utah 162 



— pediments : A discussion of the ero- 



sion of desert ranges; K. Bryan.. 152 

 Mounted skeleton of Moschops capensis 



Broom ; W. K. Gregory 223 



Natural gas decline curve ; R, H. John- 

 son 155 



— history of minerals; A. F. Rogers.. 189 

 Nature of Paleozoic crustal instability 



in eastern North America ; Charles 



Schuchert 116 



Necrology 13 



— of the Paleontological Society 203 



Nevada, Ore deposits of the Santa Fe 



district of 190 



New and rare minerals formed in lime- 

 stone by contact metamorphism ; 



A. S. Eakle 162 



Newfoundland, Middle Cambrian of. . 214 

 — , Stratigraphy and diastrophism of 



western Newfoundland 116 



New Hampshire, Dispersion of stones 



in drift in 130 



— , Geology of the Portsmouth Basin in 138 



— , Survey or road material in 154 



New Mexico, Structure of some moun- 

 tains in 116 



New mounts in the Princeton Geolog- 

 ical Museum; W. J. Sinclair 223 



— specimens of the Pleistocene bear 



Arctotherium from Texas ; W. D. 

 Matthew 224 



New York, Anorthosite-gabbro in north- 

 ern 140 



— , Fossil horse from the late Pleisto- 

 cene in 204 



Nomination of oflBcers of the Cordil- 



leran Section, 1919 194 



North America, Paleozoic crustal in- 

 stability in 116 



North Pacific Ocean, Symposium on 



problems of the 193 



North rotherhim sliastense, a. Pleistocene 

 ground sloth of North America, 

 with remarks on the Megalony- 

 chidte ; C. Stock 225 



Note.s on Mount Lassen eruptions ; T. S. 



Diller 182 



the Oriskanv and Helderberg in 



Virginia ; R. J. Holden 137 



teaching of paleobotany; M. D. 



Weston 220 



Ocean level, World-wide sinking of . . . . 112 



Occurrence of flow-breccias in Colo- 

 rado ; H. B. Patton 182 



the ore deposits of the Santa Fe 



district. Mineral County, Nevada ; 



C. W. Clark 190 



O'CoNNELL, Mar.torie ; Further studies 



on the Jurassic of Cuba 136 



Officers and members of Paleontolog- 

 ical Society. Election of 202 



— , correspondents, and Fellows of the 



Geological Society of America.... 165 



— members of the Paleontological 



Society 226 



— , Election of ' 12 



— of the Cordilleran Section, Election 



of 188 



for 1919, Nomination of. 194 



Oil fields of the Appalachians, Deep 



drilling in the 157 



— geology in relation to valuation ; R. 



Arnold 433 



— possibilities along the southern mar- 



gin of the Black Hills, South Da- 

 kota ; R. R. Morse 195 



Oklahoma, Structural features of the 



Ouachita Mountains of 121 



Oligocene EquidfB in the Marsh collec- 

 tion ; J. P. Buwalda 224 



Ouachita Mountain region, TufC in the 125 



— Mountains, Oklahoma, Structural fea- 



tures of 121 



Ordovician of Virginia and Tennessee. 137 

 Ore deposits. Colloidal migration in... 180 



of Kennecott, Alaska 157 



Santa Fe district, Nevada 190 



— enrichment. Sulphide 180 



Oregon, Ellensburg formation of east- 

 ern 185 



Origin of the basins within the Hamada 



of the Libyan desert ; W. H. Hobbs 181 

 "beach rock" (coquina) at Log- 

 gerhead Key, Tortugas ; R. M, Field 215 



tufas of Lake Lahontan ; J. C. 



Jones 179 



Oriskany in Virginia 137 



Orthaulax, Stratigraphic significance of 206 

 Oscillations of level in the belts pe- 

 ripheral to the Pleistocene ice-caps ; 

 R. A. Daly ill, 303 



Pacific coast, Diastrophism of the. . . . 181 

 Pack, J. W., Wonders of Bryce Canyon, 



Utah, by ' . . . 122 



Paleobotany, Notes on the teaching of 220 



— , Teaching of 150, 389 



Paleontologists of America 363 



Paleontology, Fossils as aids in teach- 

 ing applied 383 



— , Use of stages in development in 



teaching 395 



— , Immediate future of 150, 363 



Paleontological collections in the vic- 

 inity of Boston; P. E. Raymond.. 205 

 Paleocene, Status and limits of the. . . 221 

 Paleozoic crustal instability 116 



— section of the lower Mackenzie River ; 



E. M. Kindle 211 



— sections south of James Bay ; M. Y. 



Williams 138 



Patton. H. B., Discussion of wind sculp- 

 turing by 179 



— ; Occurrence of flow-breccias in Colo- 

 rado 182 



I'AWNEE Creek beds of Colorado ; F. B. 



Loomis 224 



Pellodites of the till 125 



Permian till argillites 125 



Petrographic geology 351 



Petrology and structural geology ; J. F. 



Kemp . 149 



Phenol red indicator as an aid to the 



geologist ; E. T. Wherry 161 



Philippines, Physiographic control in 



the 181 



Photograph Committee, Report of the. 13 

 Physical and geographic criteria in 

 the study of sedimentary deposits ; 



E. W. Shaw 411 



Physiographic control in the Philip- 

 pines ; W. D. Smith 181 



Physiography and general geology ; 



H. E. Gregory 150 



Pisolites at San Antonio, Texas ; A. 



Deussen 182 



Pleistocene bear from Texas 224 



— changes of level in northern Mani- 

 toba 131 



— , Fossil horse from the late 204 



— ground sloth 225 



— ice-caps ; Oscillations of level in the 



belts peripheral to the ; R. A. Daly 



111, 303 



— in the Dakotas 134 



— till argillites 125 



