42 THE GEOLOGY OF BELLEVILLE 
of geological history. The shores of the Bay of Quinté in very many 
places, and the high banks or terraces which run, with more or less of 
interruption, a short distance inland along the course of the above- 
named rivers, and which were evidently washed at one time by waters 
either salt or fresh, afford abundant proofs of this earlier physical 
condition of the district. The foundation rock, so to say, of this 
locality, is the well-known Trenton Limestone. This, although exposed 
in numerous places, is generally capped by a considerable thickness 
of Drift clay, sand, and gravel, with boulders of limestone and various 
eneissoid rocks, such as lie more or less immediately along the northern 
confines of the tract in question. Around Belleville itself, more par- 
ticularly, the upper portion of the Drift consists of very finely stratified 
sand and light-coloured plastic clay, overlying gravel and other coarser 
materials with boulders of various kinds. The accompanying sketch- 
section across the River Moira will serve to convey an idea of the 
extensive denudation to which the Drift has been here subjected. In 
this section, a is the upper thin-bedded portion of the Trenton lime- 
stone, and 6 and ¢ are the Drift beds. In consequence of this 
denudation the beds ¢ are only of partial occurence, but I remarked 
them in several places at considerable distances apart. They are 
especially well shewn on the side of a hill or steep bank through which 
a street is cut, in the vicinity of the Court-house, Belleville. | 
A deposit of calcareous tufa derived in great part from minute fresh- 
water shells belonging to cyclas, planorbis, and other genera, cunstitutes 
a comparatively recent formation extending over a considerable area on 
the top of the drift bank or high ground on the west side of the river. 
It marks the site of an old swamp, now drained off. The same modern 
calcareous formation occurs still more extensively along the foot of the 
so-called ‘ mountain” at Trenton, (where it was kindly pointed out to 
me by the Rev. Mr. Bleasdell of that village,) and undoubtedly in 
many other places ; although the above were the only spots m which 
it came under my personal observation. It may be stated, as a general 
