PUBLICATIONS 



Xlll 



Brochures of Volume 21 

 Brochures. Pages. Plates. 



Proceedings* of the Twenty-second 



Annual Meeting of the Geological 



Society of America, held at Boston 



and Cambridge, Massachusetts, 



December 28, 29, 30 and 31, 1909. 



E. O. HovEY, Secretary 1-68 1 



Proceedings of the Preliminary 



Meeting of the Paleontological 



Society, held at Baltimore, Mary- 

 land, December 30, 1908, and also 



Proceedings of the Third Annual 



Meeting, held at Cambridge, Mas- 



sachussetts, December 29, 1909. 



H. F. ('leland. Secretary 69-86 



Origin of the Alkaline rocks. R. A. 



Daly 87-118 



Evidence that the fossiliferous gravel 

 and sand beds of Iowa and Ne- 

 braska are Aftonion. B. Shimek. 119-140 2 



Some mineral relations from the la- 

 boratory viewpoint. A.L.Day... 141-178 3 



Bearing of the tertiary mountain 

 belt on the origin of the earth's 

 plan. F.B.Taylor 179-226 4 



Isobases of the Algonquin and Iro- 

 quois beaches and their signifi- 

 cance. J. W. GoLDTHWAiT 227-248 5 



Cacops, Desmospondylus ; new gen- 

 era of Permian vertebrates. S. W. 

 Williston 249-284 G-17 



Migration and shifting of Devonian 

 faunas. H. S. Williams 285-294 



Persistence of fluctuating variations 

 as illustrated by the fossil genus 

 Ehipidomella. H.S.Williams.. 295-^312 



North American natural bridges, 

 with a discussion of their origin. 

 H. F. Cleland 313-338 18-28 



Alaskan earthquakes of 1899. L. 

 Martin 339-406 29-30 



Birds hill, an esker near Winnipeg, 

 Manitoba. W. Upham 407-432 31 



Relationship of Niagara River to the 



Glacial period. J. W. Spencer . . 433-440 



Relative work of the two falls of 

 Niagara. J.W.Spencer 441-446 



Interruption in the flow of the falls 

 of Niagara in February, 1909. 

 J.W.Spencer 447-448 32-34 



Figures. 



1-7 



1-8 



1-2 



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