CONTENTS 



Page 



Proceedings of the Eleventh Summer Meeting, held at Columbus, Ohio, 



August 22, 1899 ; H. L. Fairchild, Secretary 1 



Session of Tuesday, August 10 1 



Election of Fellows 1 



Glacial phenomena of central Ohio [abstract] ; by Frank Leverett. 2 

 Random, a pre-Cambrian Upper Algonkian terrane ; by Charles D. 



Waloott 3 



The section at Schoharie, New York [abstract] ; by J. J. Stevenson. 6 

 Geological results of the Indiana Coal Survey ; by G. H. Ashley. . 8 



Triassic coal and coke of Sonora, Mexico ; by E. T. Dumble 10 



Register of the Columbus meeting, 1899 14 



Geology of Oahu ; by C. H. Hitchcock 15 



Notes on the Tertiary geology of Oahu ; by W. H. Dall 57 



The tetrahedral earth and the zone of the intercontinental seas ; Annual ad- 

 dress by the President, B. K. Emerson, with an appendix 61 



The asymmetry of the northern hemisphere ; by E. Suess 96 



Upper and lower Huronian in Ontario ; by A. P. Coleman 107 



Yolcanics of Neponset valley, Massachusetts ; by F. Bascom 115 



Geology of the Wichita mountains ; by H. F. Bain 127 



Relative ages of the Kanawha and Allegheny series as indicated by the fossil 



plants ; by David White 145 



Enrichment of mineral veins by later metallic sulphides ; by W. H. Weed. . 179 



Fault scarp in the Lepini mountains, Italy ; by W. M. Davis 207 



Camasland : a valley remnant; by G. 0. Smith and G. C. Curtis 217 



Tertiary granite in the northern Cascades ; by G. O. Smith and W. C. Men- 



DENHALL 223 



Relations between the Ozark uplift and ore deposits ; by Erasmus Haworth.. 231 

 Lower Devonic aspect of the Lower Helderbergand Oriskany formations ; by 



Cha rles Schuchert 241 



Silurian-Devonian boundary in North America ; by Henry Williams 333 



Siluro-Devonic contact in Erie county, New York ; by A. W. Grabau 347 



Jurassic rocks of southeastern Wyoming ; by W. C. Knight 377 



Igneous complex of Magnet Cove, Arkansas ; by H. S. Washington 389 



Some coast migrations, Santa Lucia range, California ; by Bailey Willis. . . . 417 



Glaciation of mount Ktaadn, Maine ; by R. S. Tarr 433 



Vertebrate footprints on Carboniferous shales of Plainville, Massachusetts ; by 



J. B. Woodworth 449 



Glacial origin of older Pleistocene in Gay Head cliffs, with note on fossil horse 



of that section ; by J. B. Woodworth 455 



Thomsonite, mesolite, and chabazite from Golden, Colorado ; by H. B. Patton. 461 



Cambro-Silurian limonite ores of Pennsylvania ; by T. C. Hopkins 475 



• Contact metamorphism of a basic igneous rock ; by U. S. Grant 503 



(iii) 



