Clinton county is located in central eastern Iowa along the Mississippi river, partly within the Mississippi loess and partly in the Iowan drift soil areas. Most of the soils are of loessial origin but there are several drift soils whose total acreage is considerable.
Stevenson, W. H. and Brown, P. E., "Soil Survey of Iowa, Report No. 8—Clinton County" (1918). Soil Survey Reports. 9.