1893.] NE^Y YOUK ACADEMY OF SCIENCES. 221 



May 22, 1893. 



Prof. R. P. WiiiTFiKLD iu the cbair, and tliiriy persons present 



SECTION OF GEOLOGY AND MINEliALOGY. 



The following papers were read : 



" The Granite at Mounts Adam and Eve, Orange County, 

 N. Y., and its Contact Phenomena," illustrated by maps, pho- 

 tographs and specimens. By James F. Kemp and Arthur 



HOLLICK. 



It described the general geology of the region, reviewed the 

 literature, which, however, is meagre, nothing having been 

 written since Mather's Report of the New York State Survey in 

 1844, and commented on the results obtained in New Jersey. 

 The petrography of the granite, and of the blue and white 

 limestones was described, as were the interesting minerals of 

 the contact zones along the borders of the granite and the white 

 limestone. The conclusions reached, were that the white 

 limestone had suffered extensive contact metamorphism from 

 the granite intrusions ; but as to whether the white limestone is 

 altered blue or not the evidence is less conclusive. The authors 

 believed, however, from the field relations, the transition forms 

 and the commingling of the two, that the white was metamor- 

 phosed blue. 



Some notes on Helderberg fossils found near Stone Bridge 

 concluded the paper. 



The contribution was discused by Professor A. H, Chlstei!, 

 especially as regards the mineralogy of the contact zones, and 

 the close parallel that they offer to those of the New Jersey 

 limestones. 



Dr. N. L. Bkitton spoke of his work in New Jersey and the 

 apparent interstratification of the white limestone with the 

 gneisses, and the opposing dips of the blue and white that led 

 him to conclude that they were of different ages. 



Remarks were also made by Prof. R. P. Whitfield. 



The paper will be published in the Annals. 



