You know it only takes a few minutes to see that Ohio and the midwest soil was formed by glaciers. Everything that has happened since has affected what we have today but it all started with the Big White Plow.
Soil Regions 1 through 8 represent the portion of Ohio that was covered by glacial ice during one or more glaciations. That is the gray part of the picture. Most people think that IS Ohio. The most common soils in these regions formed in glacial deposits. The older glacial deposits are in Regions 7 and 8. Most of the soils in the glaciated part of the state are very deep to bedrock.
The most common soils in Regions 9 through 12 formed in materials weathered from sedimentary rocks. Because soil forms more slowly from bedrock than from unconsolidated glacial material, soils in Regions 9 through 12 tend to be more shallow to bedrock than soils in Regions 1 through 8. Weathered rock, that is good for pature, trees and hiking!
Soil Regions 1, 3, 4, 7 and 9 occur in the part of Ohio where limestone, dolomite and limy shales are the most common bedrocks, and so the soils in these regions tend to have a relatively high lime content in the substratum. The glacial deposits in Regions 2, 5, 6, and 8 have a lower lime content. In most of Regions 10, 11 and 12 the soils formed in materials weathered from acid sedimentary rocks, mainly sandstone, siltstone and shale. Remember dolomite is magnesium rock and calcitic rock is high in calcium. Most of Ohio is Dolomitic rock formed.
Soils naturally become more acid over time under Ohio's weather conditions, but soils with lime in the substratum are neutral or only slightly acid in part of the subsoil. Since most plant nutrients are chemically active under neutral or slightly acid conditions, soils with more lime in the substratum are generally more fertile for crop production. Ohio farmers commonly increase crop yields by spreading lime to neutralize the acidity of the topsoil and the upper part of the subsoil.
Ohio is a pretty neat state for many reasons. It's location in the midwest, mid-atlantic and the way it was formed makes it the neat state it is.
Tomorrow I will introduce you to a friend who will write this page while we take a little sabbatical.
Be Careful What You Post!