CONTENTS AND ILLUSTRATIONS V 



Page 

 Recurrence of the Tropidoleptus fauna in the Chemung of Mary- 

 land ; by Charles K. Swartz 679 



Geological distribution of the Mesozoic and Cenozoic Echino- 

 dermata of the United States [abstract] ; by W. B. Clark and 



M. W. Twitchell 686 



Age of the Gaspe sandstone ; by Henry Shaler Williams 688 



Brachiopoda of the Richmond group [abstract] ; by August F. 



Foerste 699 



Reconnaissance in Arizona and western New Mexico along the 



Santa Fe railroad [abstract] ; by N. H. Darton 700 



Geologic studies in the Alaska peninsula [abstract] ; by Wallace 



W. Atwood 700 



Some features of the Wisconsin Middle Devonic [abstract] ; by 



H. F. Cleland 701 



Ice-borne boulder deposits in mid-Carboniferous marine shales 



[abstract] ; by Joseph A. Taff 701 



Relationships of the Pennsylvanian and Permian faunas of Kan- 

 sas and their correlation with similar faunas of the Urals [ab- 

 stract] ; by J. W. Beede 702 



Nineteenth Annual Report of the Committee on Photographs 703 



Titles of papers presented before Section E of the American Asso- 

 ciation for the Advancement of Science 703 



Register of the Baltimore meeting, 1908 705 



Sessions of the Cordilleran Section, at Stanford University, Califor- 

 nia, Wednesday and Thursday, December 30 and 31, 1908 707 



Titles of papers presented before the Cordilleran Section 707 



Proposed form of seismograph intended to give a direct indication 



of the forces [abstract] ; by W. F. Durand 707 



Accessions to the Library from November, 1908, to October, 1909 711 



List of officers, Correspondents, and Fellows 721 



Index to volume 20 737 



ILLUSTRATIONS 



Plates 



Plate 1 — Calvin : Glacial phenomena at Afton Junction and in Tama 



county, Iowa 136 



2 Glacial phenomena near Missouri valley and Oel- 



wein, Iowa 137 



" 3 Glacial phenomena near Thayer and Missouri valley, 



Iowa 140 



" 4 " Glacial phenomena in Buchanan county, Iowa 146 



" 5 " Glacial phenomena in Cerro Gordo and Palo Alto coun- 

 ties, Iowa 147 



" 6 — Turner : Rhyolite-tuff and single cone 229 



" 7 Calcareous augen-schist . . 231 



" 8 " Terrace of early Pleistocene detritus east of Fish 



Lake valley 248 



" 9 " Fault wall and bedded volcanic rocks, Silver Creek 



range 264 



