﻿Origin of the Greiiville and Hastings Series. 313 



the relations of these series, the Grenville series will 

 cease to be an anomaly among our Archi^an formations 

 and will, so far as its mode of occurrence is concerned, 

 bear the , same relation to the Fundamental Gneiss as the 

 Huronian does farther west in the Lake Superior and 

 Huron district, as shown by Lawson and Barlow ; the 

 similarity in position, however, not implying identity 

 in age. 



The recognition of the Grenville series as consisting of 

 a series of sedimentary rocks, largely limestones, invaded 

 by igneous material which now makes up by far the 

 greater portion of the series and consists largely of 

 extravasations of the Fundamental Gneiss, is now gretty 

 certainly established by the field evidence. Its recognition 

 as a portion of the Hastings series which has been 

 intensely metamorphosed, will probably be more clearly 

 established as the field work progresses. Since subor- 

 dinate areas of the Grenville series also occur to the south 

 of the St. Lawrence in the Adirondack region, and are 

 now being mapped, it will be of great interest to ascertain 

 whether the same relations do not also exist in that area, 

 •and whether a continuation of the Hastings series to the 

 south cannot be recognized in the " Huronian Schist" 

 of St. Lawrence and Jefferson counties, shown upon the 

 ■Geological Map of the State of New York, which has just 

 been issued by the Geological Survey of this State. 



It is perhaps unnecessary to draw attention to the fact 

 that the recent investigations of Messrs. Wolff, Brooks, 

 Nason, Kemp, Westgate and others on the crystalline 

 limestones of New Jersey have a certain bearing on 

 this subject. 



Eemarks by K. W. Ells : 



In connection with the statements advanced in the 

 preceding paper by Dr. Adams and Mr. Barlow, it is but 

 right that the conclusions arrived at from the study of the 

 similar rocks in their eastern and northern extension 



