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CONTENTS 



Pago 

 Proceedings of the Twelfth Summer Meetnig, held at Now York city, June 26, 



1900 ; H. L. Faikciiild, Secretary 1 



Session of Tuesday, June 26 1 



Election of Fellows 1 



Native copper near Enid, Oklahoma; by Erasmus Hawouth and 



John Bknnett 2 



Andseitic rocks near Silverton, Colorado; by Frank R. Van Horn. . 4 

 Evidences of interglacial deposits in the Connecticut valley [ab- 

 stract] ; by C. H. Hitchcock 9 



A theory of origin of systems of nearly vertical faults [abstract] ; by 



W. H. HoBBS 10 



Hudson River beds near Albany and their taxonomic equivalents 



[abstract] ; by Rudolf Ruedkmann 11 



Register of the New York Meeting 12 



Pleistocene ice and river erosion in the Saint Croix valley of Minnesota and 



Wisconsin ; by Warren Upham 13 



Giants' kettles erode' by moulin torrents ; by Warren Upham 25 



Volcanic phenomena, >n Hawaii ; by C. H. Hitchcock ' 45 



Geological record of he Rocky Mountain region in Canada; Annual address 



by the piesident, George M. Dawson 57 



"Weathering of granitic rocks of Georgia ; by T. L. Watson 93 



Glacial lakes of Minnesota ; by N. H. Winchell 109 



Marine and freshwater beaches of Ontario ; by A. P. Coleman 129 



Paleozoic limestones of Kittatinny valley, New Jersey ; by H. B. KIimmel and 



Stuart Weller 147 



Sand crystals and their relation to certain concretionary forms ; by E. H. 



Barbour 165 



A depositional measure of unconformity ; by C. R. Keyes 173 



Wisconsin shore of lake Superior ; by G. L. Collie 197 



Origin and structure of the Basin ranges ; by J. E. Spurr 217 



Broad valleys of the Cordilleras ;, by N. S. Shaler , . . . 271 



Knoydart formation of Nova Scotia ; by H. M, Ami. . . 301 



Keweenawan area of eastern Minnesota ; by C. W. Hall 313 



Keewatin area of eastern and central Minnesota ; by C. W. Hall 343 



Geology of Rigaud mountain, Canada ; by O. E. Le Roy 377 



Silurian and Devonian limestones of Tennessee and Kentucky ; by A. F. 



Foerste 395 



Proceedings of the Thirteenth Annual Meeting, held at Albany, New York, 

 December 27, 28, and 29, 1900, including Proceedings of the Second Annual 

 Meeting of the Cordilleran Section, held at San Francisco, December 28 



and 29, 1900 ; H. L. Fairchild, Secretary 445 



Session of Thursday, December 27 446 



Report of the Council 447 



Secretary's report 447 



Treasurer's report 449 



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