122 rROCEEDINGS OF THE BOSTON MEETING 



folds make with the axis of the principal anticlinorienee, which trends 

 northeast. 



Eemarks were also made by Prof. Charles Sdiuchert. 



HEART MOUNTAIN OVERTHRVST, NEAR CODY, WYOMING 

 BY D, F, HEWETT 



i Abstract) 



Investigations in 1919 in northwestern Wyoming show that this overthrust, 

 first recognized by Dake in 1916, is more extensive than first suspected and is 

 a dominant structural feature of the region. In addition to the Heart Moun- 

 tain block numerous remnants form the summits of McCullock Peak, 16 miles 

 southeast. These remnants are 28 miles east of the westernmost outcrop of 

 the thrust block and show that the displacement on the fault is at least 

 that distance. The thrust probably took place during the Upper Eocene period 

 as the Paleozoic limestones that make up the thrust block overlie Lower 

 Eocene beds and were deeply eroded before the deposition of the tuffs and 

 breccias of the Akoroka Mountains (Neocene). 



Presented with lantern-slide illustrations. 



Adjournment for the day was taken about 5.10 o'clock p. m. 



PRESIDENTIAL ADDRESS 



The evening session was held in Huntington Hall of the Eogers Build- 

 ing, where the Society and its guests gathered to listen to the address, 

 entitled "Earth sciences as the background of history," by President 

 John C. Merriam. 



The reading of the presidential address was followed by an illustrated 

 lecture by J. W. Pack,^ entitled "The wonders of Bryce Canyon, Utah." 



ANNUAL SMOKER 



The two foregoing addresses were followed by the customary annual 

 subscription smoker in the Eogers Building. 



Session of Tuesday, December 30 



The Society was called to order by President Merriam at 9.10 o'clock 

 a. m., and, after announcements by the Secretary and the local com- 

 mittee had been made, the Annual Eeport of the Council was, on motion, 

 taken from the table, adopted and ordered printed. 



^ Introduced by James F. Kemp. 



