From Ohio History Central
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<h2>A.D. 1000 to 1650</h2>
<p>The Monongahela culture is a Late Prehistoric group that occupied portions of far eastern Ohio and western Pennsylvania.
It is distinguished from other Late Prehistoric societies mainly by distinctive kinds of pottery. Monongahela culture villages were made up of clusters of houses surrounded by a circular or oval pallisade. Communities consisted of between 100 to 150 people.</p><p>The Monongahela culture is named for the Monongahela River of West Virginia and western Pennsylvania. This valley was the heartland for the Monongahela culture.</p>