Silurian-Devonian aquifers

The Silurian-Devonian aquifer has been referred to by a number of different names. It is known as the carbonate aquifer in Ohio, the Silurian-Devonian aquifers in Indiana, and the upper part of the shalow dolomite aquifer in Illinois. Dolomites and limestones of Silurian and Devonian age constitue one of the principal consolidated-rock aquifers throughout a large area in the uper Midwest.