164 GLACIAL SUCCESSION IN CENTRAL LUNENBURG PREST. 



central watershed, diorite from the south side of the Annapolis 

 valley, and trap from near the Bay of Fundy. 



First Inter glacial Epoch. 



To this epoch evidently belongs the Rhodenizer Lake kame, 

 arid the lower part of section 1 at Blockhouse. The evidences 

 of their position and antiquity are : 



1st. At Blockhouse, section 1, we have 2, a, blue clay, with 

 local drift; b, stratified soft red gravelly clay ; c, bog iron ore, 

 underlying the lower boulder clay. 



2nd. At Rhodenizer's Lake the kame seems to be overlaid 

 by boulder clay, and underlaid by the Bridgewater conglomerate. 



3rd. This kame is more highly oxidized at a depth of 30 

 feet than the boulder clay at a depth of 5 feet. At Blockhouse 

 also, the bog iron of section 1 is over one foot, showing an inter- 

 glacial period of considerable lengtb. 



4th. The Rhodenizer Lake kame seems to have suffered 

 great denudation on its western side. What remains seems to 

 be but a fraction of its former size. 



5th. Rounded, oval, and smoothly polished pebbles of quartz 

 and crystalline rocks have been found in the lower boulder clay 

 at Blockhouse, and which, no doubt, were eroded from an earlier 

 water-worn deposit, such as the Rhodenizer Lake kame. The 

 difference between the semi-angular boulders of the lower till, 

 and the polished pebbles scattered among them, was at once 

 noticeable and bespoke for the latter a far greater age. 



Since the re-excavation of the pre-glacial valley of the 

 Lahave, I cannot conceive how the conditions could have been 

 favourable for the formation of the Rhodenizer Lake kame on 

 the watershed to the east. 



That the Lahave was re-excavated before the deposition of 

 the lower boulder clay, is shown by the presence of that deposit 

 in the valley at tide level two miles below Bridgewater. The 

 formation of the kame and the re-excavation of the valley must 

 have been contemporaneous, as the deepening of the latter and 



