BUILDING STONES. 
211 
bank of the river, and is crossed by the railroad. It presents a 
face of about twenty feet, below which is the upper sandstone,, 
rising some fifteen feet above the river. Near Beloit the 
same layers are worked to furnish that place with stone. At 
Shopiere, Clark’s quarry is opened in the Galena limestone, 
and furnishes good rough stone for heavy work. 
MINERAL POINT. 
The same beds are worked here as at Janesville, and present 
nearly the same appearance. They have been used in the 
Court House building. At Platteville some very good stone 
have been used in the Seminary building, obtained from this 
formation. There is no very good quarry rock south of the 
Wisconsin, in our State. 
MADISON QUARRIES. 
The beautiful and durable building stone, so justly popular 
at Madison, is found at the base of the lower Magnesian lime¬ 
stone, and probably belongs to the transition layers between 
that and the next formation below. It is a fine-grained, ealcif- 
erous sandstone, of very even texture, of a delicate buff color, 
and distinctly stratified. It contains no fossils or flints, but 
occasionally has an excess of iron, and care should be taken 
in selecting it for fronts to reject all blocks which show any 
tendency to discoloration. This stone dresses readily, and 
may be wrought into ornamental forms with fine effect. It 
is obtained from several quarries, opened in the bluffs, about 
two miles south and west of Madison, where it exists iri 
abundance, and can be cheaply delivered on the cars. Nearly 
all the substantial buildings in Madison are constructed of this 
stone. An analysis by Dr. Hayes gives 
Silicate of Lime and Alumina,... 90.00 
Alumina and Oxide of Iron,. 3.70 
Carbonate of Lime,. 0.10 
99.80 
East of Madison, in the town of Sun Prairie, the Trenton » 
limestone is quarried extensively for fence and other purposes. 
