CONTENTS V 



Page 



Paleozoic Reptillia and Amphibia ; by E. C. Case 200 



Jurassic dinosaurs ; by W. J. Holland 204 



Cretaceous dinosaurs ; by R. S. Lull 208 



Chelonia ; by O. P. Hay 212 



Marine reptiles ; by J. C. Merriam 221 



Paleozoic fishes ; by Bashford Dean 224 



Mesozoic and Cenozoic fishes ; by C. R. Eastman 228 



Correlation and paleogeoj2:raphy ; by H. F. Osborn 232 



Evolutionary evidences ; by S. W. Williston 257 



Contributions to geologic theory and method by American workers in 



vertebrate paleontology ; by W. J. Sinclair 262 



The Monument Creek group ; by G. B. Richardson 267 



Postglacial erosion and oxidation ; by G. F. Wright 277 



Plateau of British East Africa ; by G. L. Collie 297 



Progress of opinion as to the origin of the Lake Superior iron ores ; by 



N. H. WiNCHELL 317 



Saponite, thalite, greenalite, greenstone ; by N. H. Winchell 329 



Differential erosion and equiplanation in portions of Yukon and Alaska ; 



by De Lorme D. Cairnes 333 



Correlation of the Paleozoic faunas of the Eastport Quadrangle, Maine ; by 



H. S. Williams 349 



Development and systematic position of the Monticuliporoids ; by E. R. 



CUMINGS 357 



Oriskany sandstone of Ontario ; by C. R. Stauffer 371 



Criteria for the recognition of ancient delta depoits ; by Joseph Barrell. . 377 



A Mississippian delta ; by E. B. Branson 447 



Boulder beds of the Caney shales at Talihina, Oklahoma ; by J, B. Wood- 

 worth 457 



Pre-Wisconsin channels in southeastern South Dakota and northeastern 



Nebraska ; by J. E. Todd 463 



Covey hill revisited ; by J. W. Spencer 471 



The Gros Ventre slide, an active earth-flow ; by Eliot Blackwelder 487 



Geological reconnaissance in northeastern Nicaragua; by O. H. Hershey. . 493 

 Some Tertiary and Quaternary geology of western Montana, northern 



Idaho, and eastern Washington ; by O. H. Hershey 517 



Deflative scheme of the geographic cycle in an arid climate; by C. R. 



Keyes 537 



Glaciation in northwestern Alaska ; by P. S. Smith 563 



Stratigraphy of the coal fields of northern central New Mexico ; by W. T. 



Lee 571 



Pre-Wisconsin Glacial drift in the region of Glacier National Park, Mon- 

 tana ; by W. C. Alden 687 



Mingling of Pleistocene formations ; by B. Shimek 709 



Toylan§ and Lucero ; their structure and genetic relations to other plateau 



plains of deserts ; by C. R. Keyes 713 



Abstracts of papers presented at the Twenty-fourth Annual Meeting of the 

 Society, but not published in full in the preceding pages of this volume, 

 together with discussions of papers as far as preserved ; E. O. Hovey, 

 Secretary 719 



