166 GLACIAL SUCCESSION IN CENTRAL LUNENBURG PREST. 



general course of the strise on the highlands around, is about 

 S. 45 E., while the course of the valley in which the lode lies is 

 about S. 50 E. 



At Dorey's Brook, a thin bed of partly oxidized boulder clay 

 containing granite and other northern drift, laid on the bed 

 rock ; while in the layers above, granite was absent. A large 

 morraine, 2J miles southeast of Dorey's Brook, contains much 

 northern drift, with quartz, easily recognized as coming from a 

 vein a little east of the brook. Their travelled course was about 

 S. 40 E. The lower till, where covered by an upper layer of 

 later origin, is but slightly oxidized, and in some places not at 

 all ; but this is probably owing to subsequent denudation, I 

 have not been able to divide the till of the northern part of this 

 district into an earlier and later deposit. The inference from 

 this seems to be, that the next interglacial recession did not reach 

 to the northern part of the area under discussion. A single 

 deposit would there include what is represented further south 

 by the deposits of two apparently distinct glacial epochs separ- 

 ated by a short interglacial period. 



Second Interglacial Epoch. 



This should be classed as a slight re-cession of the glaciers, 

 rather than an interglacial epoch-. The evidence at hand seems 

 to indicate that while there was a re-cession of the ice at Block- 

 house, it did not retire as far north as the granite, or even as far 

 as the next quartzite belt, two or three miles distant. However, 

 in its effect upon the purpose of nry work, viz., the discovery of 

 a gold bearing vein, it was adequate to an ordinary interglacial 

 epoch, as it divided the drift into two portions, differing in 

 character, condition of contents, and in the course traversed by 

 it. The deposits belonging to this epoch consist, at Blockhouse, 

 of red and yellow ochreous clay, (see section 2) ; finely stratified 

 sand, (section 3) ; thin bed of bog iron, (section 4). 



At Dorey's Brook are various coloured clays underlaid and 

 overlaid by unstratified drift (see section). The overlying drift 

 in all these sections is of local, and the underlying drift chiefly 



