UNION COUNTY. 325 



streams all join the main streams from the same direction, but in Union 

 county streams enter the main valleys from opposite sides. The surface 

 between the streams is flat, and there is no evidence of a thickening of 

 the Drift, except between Big Darby and Mill creeks. The Big Darby is 

 the largest stream of the county. 



SURFACE FEATURES. 



Between Big Darby and Mill creeks there is a very noticeable thicken- 

 ing of the Drift. It rises into long ridges and high knolls, which consist 

 of hard-pan or glacier Drift. Northern bowlders and stones are on the 

 surface and in the soil indiscriminately, though the same is true to some 

 extent throughout the county. This ridge of Drift is greatly developed 

 at New California, where wells are sunk to the depth of fifty-four feet 

 without meeting anything but "blue clay," the water obtained being 

 bitter. West and south of Marysville two or three miles, the surface 

 is high and rolling, with clay hills. Toward the north and east it is flat, 

 with gravel near the surface in some places. Between Milford Center 

 and Unionville "clay knobs" and rolling land can be seen north of Darby 

 Creek, while toward the south and in Union township the " Darby plains " 

 extend several miles. Wells at Pottersburg penetrate the Drift over 

 sixty feet without meeting the rock, but obtain good water at that depth. 

 About Newton there is a very rolling and bluffy tract of land, some of 

 the wells obtaining bitter water in "blue clay" at fifty-two feet. This 

 rolling strip of clay knobs dies out toward the south and west, and 

 toward the north and east. Throughout the rest of the county the sur- 

 face is very nearly flat, wells being usually less than twenty-five feet. 

 This belt of clay knobs crosses the entire county, although it seems to 

 turn a little toward the north in Jerome township. 



The following elevations above Lake Erie are taken from profiles of 

 railroads that cross the county : 



Richwood 369 ft. 



Broadway 422 " 



Peoria 



Dover 



Marysville 425 " 



Milford 



Unionville 



Plain City 



The following points of elevation were obtained by aneroid barometer, 

 connecting with railroad stations : 



