RECORDS OF MEETINGS 421 



SECTION OF GEOLOGY AND MINERALOGY. 

 October 3, 1910. 



The Section met at S :20 p. m., Vice-President George F. Kunz pre- 

 siding. 



The minutes of the last meeting of the Section were read and approved. 



Before proceeding to the regular programme of the evening, Dr. George 

 F. Kunz presented some of the results of explorations conducted by the 

 commission investigating choice of site for the proposed Hudson River 

 bridge. Dr. Kunz reported that rock foundations are wanting, except on 

 the present river margins, a condition that would seem to require a span 

 of such extraordinary length that it is a question whether it should be 

 attempted at all. It is his opinion that the bridge plan will finally be 

 abandoned in favor of tunnels, several of which could be constructed for 

 the cost of one bridge. Furthermore, they could be so placed that the 

 several tunnels would accommodate different sections of the city and 

 together be of greater service than the bridge. 



The following programme was then offered : 



6. S. Rogers, Original Gneissoid Structure in the Cort- 



LANDT Series. 

 Jesse E. Hyde, Some Structural Modifications of the Inwood 



Limestone. 

 Charles P. Berkey, Additional Notes on the Interbedded Lime- 

 • stone in the Fordham Gneiss of New York 



City. 

 George H. Girty, New Species of Fossils from the Thaynes 



Limestone of Utah. 

 George H. Girty, Description of some new Genera and Species 



OF Carboniferous Fossils from the La-fay- 



etteville Shale of Arkansas. 



Summary of Papers. 



Mr. Rogers gave the results of his own observations in field work and 

 illustrated his remarks by lantern slides. Remarks on the similarity of 

 these occurrences to those of the Scandinavian Peninsula were made by 

 Professor J. F. Kemp. 



Mr. Hyde called attention to the evidence of dynamic results of a dif- 

 ferential nature in different layers of the Inwood near Spuyten Duyvil 



