Appanoose County is located in southeastern Iowa in the fourth tier of counties west of the Mississippi River and adjoins the state of Missouri on the south. It is entirely in the Southern Iowa loess soil area, and about one-half of the soils of the county are of loessial origin, the remainder being of drift origin and representing areas from which the loessial soil has been removed by erosion.
Stevenson, W. H. and Brown, P. E., "Soil Survey of Iowa, Report No. 53—Appanoose County Soils" (1928). Soil Survey Reports. 67.