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307 Lakes

into the hands of actual settlers, and been improved and occupied for useful purposes. This part of the county is however almost one continued prairie; that portion not represented on the maps as such, being [only] but slightly covered with trees or bushes. This great prairie, the largest in the Territory is known as Rock Prairie. The eastern portion of the county is based on limestone towards Sugar river [red] sandstone is found.

Agreeably to the census there were in 1840 in this county 389 horses, 1804 meat cattle, 131 sheep, 3560 swine, one distillery, 2 grist milles and 5 saw mills: and the produce of the preceeding year is stated at 24,702 bushels of wheat, 312 of barley, 21,990 of oats, 485 of rye, 741 of buckwheat, 31,229 of Indian corn, and 28, 605 of potatoes; 2,089 tons of hay, & 1400 pounds of maple sugar.

Lake Koshkonong, which lies principally in Jefferson county extends a short distance into Rock, and there are twelve small lkes in the county; none of them however exceeding a mile in length. Deer Lake on section twenty in township four range thirteen is about half a mile long and covers eighty seven acres.

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