﻿G. H. Kinahan — Irkh Granitic Eocks. 375 



The author described the oconrrence in the northern part of Nova 

 Scotia of a great baud of Silurian deposits, running nearly east 

 and west, and traversed in a corresponding direction by numerous 

 detached bands of granites, syenites, etc. Roughly parallel to the 

 line of the latter there is a tolerably well-defined series of fractures 

 running from Parrsboro on the Bay of Fundy to Gruysboro on the 

 Atlantic coast. The course of this line of disturbance is marked by 

 metamorphism, and by the presence of associated ores of iron and 

 copper. The principal localities where the latter occur are noticed 

 by the author, who states that the copper deposits attain their 

 greatest development near Lochaber Lake and Poison's Lake, 

 where they form a series of veins, cutting at oblique angles black 

 and red shales and quartzites, apparently of somewhat doubtful age. 

 The quality of the ore is said to be good. 



13. " Glacial Drift in the North-eastern Carpathians." By R. L. 

 Jack, Esq., F.G.S., and John Home, Esq., F.G.S., of the Geological 

 Survey of Scotland. 



In this paper the authors noticed the statements of previous 

 observers as to the occurrence of glacial drift in the northern part 

 of the Carpathian range, and described the rock-formations sur- 

 rounding the head waters of the Theiss, and some drift sections 

 observed in the valley of that river. They arrived at the following 

 conclusions : — Glacial deposits are not abundantly developed in the 

 valleys of the north-eastern Carpathian. The drift in the upper 

 reaches of the Theiss is of the most fragmentary character, and is 

 confined mainly to the broader portions of the valley. There is, 

 however, sufficient evidence for maintaining that the Theiss valley 

 was filled with a glacier upwards of 45 miles long, although the 

 authors were unable to determine whether this glacier ever debouched 

 on the plains of Hungary or ever reached the edge of the Carpathian 

 chain ; but they think it probable that such was the case. 



14. " On Terminal Curvature in the South-western Counties." 

 By W. A. E. Ussher, Esq., F.G.S., of H.M. Geological Survey. 



The author discussed the views advocated by Mr. D. Mackintosh 

 on the terminal curvature of slaty beds (Q. J. G. S. vol. xxiii. p. 

 326), and objected to the hypothesis that the phenomenon was pro- 

 duced by the action of ice in any form, which was the agency to 

 which Mr. Mackintosh was most inclined to ascribe it. The author 

 thought that what has been called terminal curvature might be pro- 

 duced by three distinct causes, namely, — 1. The curvature produced 

 by internal movements at great depths, afterwards rendered super- 

 ficial by long subsequent denuding agencies ; 2. The action of 

 wedging frosts on the upturned edges of the beds as advocated b}'" 

 Mr. Godwin- Austen ; and 3. The intrusion between the laminae of 

 the rocks of the roots and rootlets of growing trees. 



15. " On the Chronological Classification of the Granitic Eocks of 

 Ireland." By G. H. Kinahan, Esq., M.E.I.A. Communicated by 

 Prof. Eamsay, F.E.S., F.G.S. 



The author adopts Scheerer's definition that a granite is a rock 

 of certain constitution, in which all the constituents are separately 



