From Ohio History Central
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Ohio owes much of its prosperity to the glaciers of the Pleistocene Ice Age. Our rich agricultural soils are glacial deposits scraped up as the glaciers moved south. One only has to compare agriculture in western, central, and northern Ohio with that of unglaciated southeastern Ohio, where the soils are thin and unproductive. Lake Erie and the Ohio River, major sources for water, transportation, and recreation were created by the glaciers. The abundant sand and gravel deposits of the state furnish a vital building material that is used in the production of roadbeds, concrete, and many other uses. These deposits are important aquifers for abundant supplies of ground water. Glacial clays have been used extensively to make bricks and other ceramic products. Finally, the glaciers did the final sculpting of the landscape, providing building sites and scenic vistas. During the Holocene Epoch, the last 10,000 years, modern streams have deepened their valleys and humans have modified the landscape in many areas, but basically we look at the land on a daily basis much as it was left by the glaciers.