The USDA-Natural Resources Conservation Service conducts soil surveys and provides technical assistance to private landowners.
Soils data for Ohio are found at the Web Soil Survey. From Web Soil Survey you can view soils maps, make thematic maps, run reports and view Soil Survey manuscripts (where available). For additional assistance and a brief overview, follow Get Started using Web Soil Survey. Soil Surveys on CD and SSURGO Data Viewer CD’s are also available. Historical replica CD's are available for some counties. Soil Data Viewer may be used with ArcGIS software to run tables and make thematic maps. Soils and other GIS layers may also be found at the Geospatial Data Gateway.
Because soil affects and is affected by other elements in the environment, it is not surprising that boundaries between the 12 soil regions correspond to boundaries between other natural and cultural regions. USDA recognizes 24 distinct Land Resource Regions in the country based on land use, elevation and topography, climate, water, soils, and potential natural vegetation. Ohio is part of four Land Resource Regions that extend from Maine to northern Alabama and as far west as eastern Nebraska.
Miamian is the State Soil of Ohio. Miamian soils are the most extensive soils in Ohio and occur on more than 750,000 acres in the State. They are a productive soil with corn, soybeans, and winter wheat the primary crops. Soils in the the Miamian series consists of very deep, well drained soils which is high in lime content. Miamian soils typically have a very dark grayish brown to brown silt loam or loam topsoil layer ("A horizon") 5 to 10 inches thick. They commonly have a brown or yellowish brown subsoil layer ("B horizon"), 8 to 35 inches thick, with a higher clay content than the A horizon. Below the subsoil, soils in the Miamian series have a brown to light olive brown substratum ("C horizon") that is slightly or moderately alkaline and has a lower clay content than the B horizon.