T. 8. Hunt on the Geology of Southwestern Ontario. 359° 
upper part of the Salina formation, is about 600 feet in Lon- 
don and Enniskillen, and farther eastward, in Tilsonburg and 
Marys, considerably greater, exceeding by an unknown 
amount, in these localities, 854 and 700 feet. The Cornife- 
tous at its outcrop in Woodhouse, twenty-five miles to the 
east of Tilsonburg, measures only 160 feet thick, so that there 
is evidently, in the localities just mentioned, a great increase 
in the volume of the Salina formation from the 300 feet ob- 
served in western New York, At Goderich, on Lake Huron, 
the thickness of this formation is much greater. Here are 
found non-fossiliferous strata, having the character of the so- 
called Water-lime beds, which belong to the summit of the 
: 
oe: 
3 
: 
3 
0 
After the 164 feet of free, rock salt was met with, interstrat- 
ified with clay, through a distance of forty-one feet, beneath 
Which the boring was carried five feet in a solid white lime- 
ome probably belonging to the underlying Guelph formation. 
ntical results, including the mass of rock salt at the base. 
These borings now yield, by pumping, a copious supply of 
brine, nearly saturated and of great purity, so that this newly 
liscovered saliferous deposit has already attracted the atten- 
on of salt manufacturers, both in Ontario and New York. 
A detailed description of the first well, with an analysis of the 
vil be found in the Geological Report for 1866, already 
terred to, : 
Brines are said to have been met with at this horizon im 
_ Sennected with accumulations of salt at its base, would ao 
_ 1 point to ancient basins, or geographical depressions in the 
