Divisions
The current map sought to divide the Wissahickon into three informal units. The type described here has been the restricted Wissahickon, or its eastern most section that exists in the City of Philadelphia and eastern Delaware County. The Glenarm Wissahickon and Mt. Cuba Wissahickon are two units described in western Delaware and Chester Counties, Pennsylvania. The metamorphic and depositional histories of these two series are different from the Wissahickon type described here.
Read more about this topic: Wissahickon Formation
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