Character and History of the Upper Ohio River Valley
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چکیده
Dismemberment of the preglacial Teays Valley system and development of the present Ohio River valley began in late Tertiary or early Pleistocene. By Illinoian time the present Ohio River was largely established in its present course, except for its headwaters above mile 114, which still flowed northward. The Illinoian glacial advance into northwestern Pennsylvania caused diversion of this portion of the Ohio River into its present course. The bedrock valley was deepened and broadened during the Sangamon interglacial stage, and was filled with fluvioglacial deposits during the Tazewell and Gary ice advances into northwestern Pennsylvania. Post-Gary activity of the river has included downgrading and the cutting of terraces, which are floored with flood-plain deposits.
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