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WISCONSIN STATE AGRICULTURAL SOCIETY. 
they bear some relation to this system of physical disturbance 
I have no doubt. 
These sink holes do not appear to be confined to any one 
part of this elevation, or any one geological formation. I have 
noticed them through almost its entire length. In one place 
where a branch of the East Peccatonica cuts back into this 
elevation in town six, range four east, I counted as many as 
ten of these sink holes on about a section of land, some of 
them ten, others fifteen feet deep. Mr. Thomas Strutt, a far¬ 
mer living in the neighborhood, told me that in the spring, 
when considerable water falls and flows into these places, he 
has known the bottom to give out or sink down several feet. 
What is very interesting in connection with this place is, 
these sink holes are found about the center of the mineral belt 
on the south side of this elevation, and are cutting down into 
the lower magnesian limestone; and from the fact that the 
water passes freely through them they must be connected 
with the strata below. To the north cf this place, and a little 
to the north of the center of the elevation we find sink holes 
in the upper sandstone, or the St. Peter’s sandstone as it is 
called in the books; and where the strata thicken we find 
them in the Galena limestone also. 
About sixteen miles to the west of this, in town six, range 
two east, and about four miles to the north of the village of 
Linden, on the summit of this elevation is a very noted sink 
hole. It is about 225 feet long, 125 feet wide, and from 25 to 
30 feet deep. It is now a pond of water, the lower portion 
having been filled with clay soil and other material washed 
into it from the surrounding country. Mr. J. U. Baker, an 
old resident there, told me, some time since, that twenty-five 
years ago it was not filled as it is now, but was open to a great 
depth. He stated also that when water flowed into it from 
heavy rains, it would find its way in a very short time in a 
turbid state to his spring, a distance of nearly a mile to the 
north. There is a point here worthy of our attention. The place 
where the water enters the sink hole on the summit of this 
elevation is almost on the top of the galena limestone; where 
