860 



BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



Proposed new nomenclature of the Ap- 

 palachian Coal Measures ; »G. H. 

 Ashley Ill 



Prouty, W. F. ; Age of the Talladega 



phyllite 151 



Publication rules of the Geological 



Society 169 



Purcell Range, Relation of Canadian 



Rockies to 91 



Putnam, G. R. : Condition of the earth's 

 crust and the earlier American 

 gravity observations 113, 287 



Pyrrhotite, Some etching tests on. . . 226 



Quantitative study of the derivation 

 of North American Algonkian sedi- 

 ments ; A. C. Trowbridge and W. S. 



Glock 108 



Quebec. Alnoitic from Isle Cadieux. . . . 130 

 — , Tillite at Levis 99 



Raxcho la Brea, Flora of the 204 



Raymond, P. E. ; Possible habits of 



cephalopods and trilobites 197 



— ; Trenton of central Tennessee and 



Kentucky 109, 571 



Recext eruption of Lassen Peak ; A. L. 



Day and E. T. Allen Ill 



— geological work in Gulf Coast oil 



fields ; E. T. Bumble 207 



Recoxxaissaxce of the eastern Andes 

 between Cochabamba and Santa 

 Cruz, Bolivia ; K. C. Heald and 



K. F. Mather 121, 55:'. 



Red Beds and terrestrial vertebrates of 



the Appalachian 671 



— limestones and their geologic signifi- 



cance ; J. J. Galloway 105 



Reeds, C. A., and H. F. Osborx ; Old 

 and new standards of Pleistocene 

 division in relation to the prehis- 

 tory of man in Europe 140, 411 



— ; Transgressions, regressions, and 

 shoreline displacements during the 



Pleistocene 140 



Reflected hills in petroleum geology ; 



S. Powers 226 



Register of the Amherst Meeting 160 



— ■ — ■ of the Paleontological 



Society 216 



■ — California Meeting of Cordil- 



leran Section 189 



Reid, H. F. ; Isostasy and earth move- 

 ments 114, 317 



— ; Some astronomical tests of the 



planetesimal hypotheses 140 



Relation of deep-seated faults to sur- 

 face structure in the region north- 

 east of the Yellowstone Park pla- 

 teau ; W. T. Thorn, Tr 9D 



Relatioxship of the Great Basin and 



Great Plains fauna: E. L. Troxell. 210 

 Report of the Auditing Committee. . . . 113 



■ of the Paleontological 



Society 207 



— • • — - — Council 6 



— Committee on Policy 136 



— of the Paleontological So- 

 ciety 193 



-Committee on Teaching of Geol- 

 ogy : H. F. Cleland 55 



— Editor 11 



— ■ — ■ — - Secretary 6 



Treasurer 9 



Recession of the land-ice in New Eng- 

 land ; E. Antevs 86 



Revision of the Paleozoic systems. 

 Part II : The Ordovician svstem ; 

 E. O. LTrich 112 



Page 



Restoration of Blastomenjx ; R. S. Lull 211 



— ■ — Eijoreodon socialis, Marsh; M. R. 



Thorpe 213 



Results obtained by improved methods 

 of extracting petroleum ; R. B. 

 Bossier 224 



Retrograding of offshore bars ; D. W. 



Johnson 121 



Rhode Island minerals, Crvstallogra- 



phy of three * 229 



Rock density and isostasy 114 



Rogers. A. F. ; A studv of crvstal svm- 



metry \ . . 229 



— ; Collophane, a much-neglected min- 

 eral 189 



— ; Tridymite-orthoclase rock, a new 

 metamorphic rock type from Im- 

 perial County, California 129 



— , Secretary ; Proceedings of the Twen- 

 tieth Annual Meeting of the Cor- 

 dilleran Section of the Geological 

 Societv of America, held at Berke- 

 ley, California, March 26, 1921... 1S7 



— : Use of plans and elevations in 

 teaching geometrical crvstallogra- 

 phy 229 



Role of cross-waves in the formation 

 of tomboloes and points ; R. H. 

 Johnson 122 



isostatic stress; B. Willis... 114,371 



Runner. J. J. ; Gold-bearing cumming- 

 tonite schists of the Black Hills, 

 South Dakota 225 



— ; Index minerals for the interpreta- 

 tion of geological history 230 



Saixt Johx, O, H., Bibliography of... 43 



— . Memorial of 31 



Salixa beds, Source of sulphates in the 150 



Salterella. Nature of 196 



Sax Axdreas fault, Mechanics of the. . 189 



Saxd grains, Interpretation of 104 



Sax Salvador. Basaltic lava from 143 



Sayles, R. W. : Preliminary notes on 

 some regularly banded argillites 



which suggest seasonal deposition . 133 



— ; Possible tillite at Levis, Quebec... 99 

 Schuchert. C. ; Devonian of Oklahoma, 

 with special reference to the Oris- 



kany and Camden formations 665 



— : Oriskany of Oklahoma 151 



— : The Andean geosyncline 90 



Seasoxal deposition suggested by 



banded argillites 133 



Secretary's report 6 



Sedi.mexts. Weight per unit volume of. 114 

 Shales, Constitution of Ohio black. . . . 152 

 Shaxxox. E. V., and E. T. Wherry ; 

 Crocidolite from eastern Pennsyl- 

 vania 229 



— ; White chlorite from eastern 



Pennsylvania 229 



Shepard. F. P. : Structural relation of 

 the Purcell Range to the Canadian 



Rockies 91 



Shiu, China. Antimony mines of 149 



Silicates of the contact limestones of 



Crestmore, California : A. S. Eakle 230 

 Sillimaxite-schist inclusions in gran- 

 ite ; W. .7. Miller 130 



Silver ores from Arizona and Ontario. 225 

 Sinclair. W. J. ; Stratigraphy of the 

 lower Oreodon beds of the South 



Dakota Big Badlands 155 



— ; Hyracodons from the Big Badlands 



of South Dakota 209 



Skirvix, O. W. ; Experimental study of 

 the invasion of oil into a water- 

 wet sand 224 



