CHAPTER LXXVIILI. 
REPORT ON THE GEOLOGY OF CHAMPAIGN COUNTY. 
BY FRANKLIN C. HILL 
SITUATION AND AREA. 
Champaign county lies south of the middle of the western half of the 
State, and is bounded, on the north, by Logan and Union counties ; on the 
east, by Union and Madison; south, by Clarke, and west, by Miami and. 
Shelby counties. Its boundaries are mostly the section lines, and its 
genéral shape is that of a rectangle, of about twenty-three miles in 
length, east and west, by an average width of fifteen and a half miles, 
north and south, including an area of about 3563 square miles, or 228,160 
acres. | 
The name, “Champaign,” admirably expresses the character of thé 
country ; for, although in a few places a little hilly, as a whole, the sur- 
face is very level, and made up of plains. 
DRAINAGE. 
Although a small part of the eastern edge of the county drains into 
the tributaries of the Scioto, and the waters of a still narrower strip on 
the west flow into small branches of the Great Miami, by far the greater 
part of the county is drained by the Mad River. 
The main stream of Mad River, rising among the slate hills of Logan 
county, crosses the north Line of Champaign, at a point about one-third 
of a mile west of the middle, flows in an almost straight course south- 
* ward, and leaves the county at a point about two miles farther west. 
Mackachack Creek, escaping from Logan county, about a mile east of 
Mad River, flows almost parallel to it for several miles, making its june- 
tion about a mile below the north line of Concord township ; and King’s 
Creek comes in, from the north-eastern townships, about two miles farther 
southward, and about one and a half miles north of the middle of the 
county. 
These streams, rising in the highest and most rocky parts of Logan 
and Champaign counties, and fed by unfailing springs, are strong, con- 
stant, and rapid, furnishing many good mill sites. 
