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 Interglacval Epoch. 
To this epoch evidently belongs the Rhodenizer Lake kame, 
and the lower part of section 1 at Blockhouse. The evidences 
of their position and antiquity are :— 
Ist. 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 length. 
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 
