CONTENTS. V 



Page. 

 Proceedings of the Third Annual Meeting, held at Washington December 29, 

 30 and 31, 1890 607 



Session of Monday, December 29 607 



Report of the Council 608 



Election of Officers and Fellows 609 



Obituary Notice 610 



Discussion on the Geological Structure of the Selkirk Range ; by 

 C. D. Walcott 611 



Evening Session, Monday, December 29 612 



Illustrations of the Structure of G-hicial Sand-Plains; by W. M. 

 Davis and H. L. Rich 612 



Glaciers of the St. Elias Region, Alaska ; by I. C. Russell 612 



Session of Tuesday, December 30 613 



Evening Session, Tuesday, December 30 615 



Eirst Annual Report of the Committee on Photographs 615 



Session of Wednesday, December 31 631 



On the Occurrence of Megalonyx jeffersoni in central Ohio (abstract) ; 

 by Edv^ard Orton 635 



On the Family Orthidse of the of the Brachiopoda (abstract) ; by 



James Hall 636 



On a Jointed Earth Auger for Geological Exploration in Soft De- 

 posits (abstract); by N. H. Darton 638 



On the Occurrence of Diamonds in Wisconsin ; by F. G. Kunz — 638 

 On the Occurrence of Fire Opal in a Basalt in Washington State; 



by G. F. Kunz 639 



A Fallen Forest and Peat Layer beneath Aqueous Deposits in Dela- 

 ware ; by H. T. Cresson 640 



Register of the Washington Meeting 644 



List of Officers and Fellows of the Geological Society of America 645 



Index 653 



ILLUSTRATIONS. 



Plate 1 — Herrick: New or imperfectly known Fossils from the Ohio Waverly 



(19 figures) 48 



" 2— Hayes : Map of Rome and Cartersville Thrust Faults 152 



" 3 " Actual and ideal Sections of Rome and Cartersville Thrust 



Faults (4 fissures) 152 



" 4 — Geiger and Keith : Geologic Map of Harper's Ferry Region 158 



" 5 " Sections through Harper's Ferry Region (10 fig- 

 ures) 158 



