264 



J. Halle — Geology of the FaUcIand Isles. 



but that a continuous band of that rock does extend for a distance of 

 four and a half miles along a line running from Bontnewydd on the 

 north-north-east to Brynmawr Farm on the south-south-west, and that 

 such an outcrop should be marked on the Survey geological maps 

 instead of the rocks at present represented on them. Whether this 

 middle band of felsite is continuous with the eastern band, or not, or 

 whether the Survey maps are correct in showing the so-called 

 Cambrian Grits as extending continuously from the Gwirfai River to 

 the south-west, it appears at present impossible to determine, for the 

 relationships of these older rocks are completely obscured by the thick 

 ■covering of glacial deposits. 



I I Corn brian rocks as 

 ^ ^ shevrn on Survey Maps. 



K-J_(V] OuartT, -Felsite as 



^ — ^ shetvn on Suri/ej/ A}aps 



HvK+j Exposures of- (puanC^-Fe/site 

 ' ^ not prev-iously recor elect 



Tixe figures i~y, refer 



Co the LocallCies men-, 

 -dorvecL in Letterpress^ 



^^nnog fcMr 



Scale: Six miles Co oneinck. 



Sketch-map of some unrecorded exposures of Quartz- Felsite iu North-'West 

 Carnarvonshire. 



YI. — Note oif the Geology of the Falkland Islands. 



By J. Halle, Geologist to the Swedish Magellanic Expedition, 

 (Communicated by Dr. Carl Skottsberg, Director of the Expedition.) 



THE Swedish Magellanic Expedition spent some time in the Falkland 

 Islands before proceeding to Tierra del Fuego, where important 

 work is being caz'ried on. The writer utilised his stay in the Falklands 

 to study tlie geology and collect fossils. The following is a brief note 

 of the work there. 



