446 
[Assembly 
burgh, ana in other places, tufa and marl are burned for lime. Two 
and a half miles east of Angelica, a bed of tufa has been worked for 
several years ; the best portions only are used, and so little care taken, 
that much is unnecessarily destroyed. A mile and a half east of Por- 
tage, near the residence of Mr. Paine, there are several beds ; and two 
of small extent near Roger's bridge ; one of these is opposite the lower 
falls ; the other at the entrance of the gorge below the little flat, on 
which Lefoy's mill stands. 
Two deposits of marl occur in the town of Rushford ; one underly- 
ing a swamp, on the land of Judge Mc Call ; the other near the road. 
Also at Caneadca, there is a small deposit a little above the level of the 
valley. At neither of these localities has it been used for lime. 
In Livingston county a mile east of Caledonia, an extensive deposit 
of marl occurs in a recently drained swamp. Another north of this 
town, and extending into it, was described in the Report of 1838. 
Near Batavia, several small swamps or ponds contain marl, and also 
the springs or ponds, the source of Spring creek. About three or four 
miles north of Leroy, between the gypsum beds and Bergen, there is a 
large marl swamp ; the extent of the deposit I did not learn, but it is 
probably great, resulting as it does, from the marls and slates of the 
gypseous formation. Two and a half miles south of Leroy, on the land 
of Archibald Stewart, and an adjoining farm, a marl bed covers about 
twenty acres, with an average depth of probably eight feet ; a few 
rods from the margin being five, a little distance farther nine, and the 
centre fifteen feet. This marl is covered by muck, from one to two 
feet thick. Mr. Stewart has applied the marl as manure, and finds am- 
ple returns. 
In examining Silver lake, I found the bottom in many places covered 
with a growth of Chara, which when first thrown out looks green, and 
on a little exposure becomes white and brittle, readily crumbling to 
powder; they are almost wholly composed of carbonate of lime. The 
same species is found abundantly in the outlet of the Caledonia spring ; 
and so rapid is its growth, that frequent removals are required to pre- 
vent it from impeding the water in the sluiceways to the mills. 
Towards the inlet, the bottom of the lake is covered with marl seve- 
ral feet deep, but I was not able to ascertain whether it occupied the 
