File:Fig 4 Relation between the present stream bed and the rock floor.jpg

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Relation between the present stream bed and the rock floor along the preglacial Upper Allegheny River

Description	English: Relation between the present stream bed and the rock floor along the preglacial Upper Allegheny River
Date	15 December 2019
Source	United States Geological Survey, Charles D. Walcott, Director; Glacial Formations and Drainage Features, Erie and Ohio Basins, Vol 41; Frank Leverett; Washington Government Printing Office, Washington, D.C.; 1902
Author	Frank Leverett

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