AND THE SURROUNDING DISTRICT. AG 
The “petites saillies coniques,’ the distinguishing character of 
d’Orbigny’s Monticulipora, appear to be a necessary consequence of 
the mode of reproduction exhibited by Stenopora.* 
On proceeding north of Belleville, the thin-bedded limestone gives 
place to the lower or thick beds, and these in turn merge into a sili- 
cious limestone, the probable equivalent of the Black River sub- 
division ; although the country is so thickly covered by Drift, that 
sections are only observable here and there. At the village of Hun- 
gerford, in the township of that name, the grey silicious limestone is 
seen to overlie a series of thin flat layers of a reddish calcareous sand- 
stone with pale green spots distributed irregularly through its mass, 
This rock is apparently an abnormal form of the Potsdam sandstone, 
or, perhaps a bed of passage between the Potsdam sandstone and the 
Calcareous sand rock, as it contains from 40 to 50 per cent. of dolomitic 
carbonate of lime. I found no traces of organic remains in it. I should 
be inclined to look upon it as the calcareous sand rock, were it not for 
its agreement, in certain of its physical characters, with the Potsdam 
sandstone as recognised elsewhere. From this part of the country 
however, westward to Georgian Bay, the beds between the base of the 
Trenton and the outcrop of the Laurentian series, are more or less ob- 
scure—thinning out altogether, or merging, as it were, one into the 
other. About three miles north of Hungerford village (or perhaps 
less, the intermediate space being greatly obscured by Drift) the 
Laurentian or Gneissoid rocks begin to crop out, dipping at a high 
angle to the north-east, or in a contrary direction to the slight dip of 
the Silurian strata. Close to the southern limit of the Laurentian 
outcrop a fine band of crystalline limestone occurs, interstratified with 
dark grey and reddish beds of gneiss. This may be conveniently 
examined at the village of Bridgewater in Elzevir Township on the 
property of Billa Flint, Esq., to whose enterprising spirit, that part of 
the country owes.so much. The specimens of crystalline limestone 
‘obtained at this spot, form a marble of excellent quality. I have to 
regret that from want of time I was unable to examine the run of the 
band, and its quality at other points. A few fragments of galena and 
some impure steatite were shown to me, as haying been met with near 
at hand. 
* These remarks were written several months ago. Inthe last number of the Canadian 
Naturalist, we were gratified to find the identity of the so-called Chetetes lycoperdon with 
Stenopora fibrosa also adopted by Mr. Billings. 
