Wissahickon Formation
Mapped bedrock unit in Pennsylvania, New Jersey, and Delaware / From Wikipedia, the free encyclopedia
The Wissahickon Formation is a mapped bedrock unit in Pennsylvania, New Jersey, and Delaware. It is named for the Wissahickon gorge in Fairmount Park, Philadelphia.
Quick Facts Type, Sub-units ...
Wissahickon Formation | |
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Stratigraphic range: Ediacaran to Early Cambrian (Depositional) | |
Type | Geological formation |
Sub-units | Mt. Cuba, Doe Run schist, Laurels schist, Greystone schist |
Underlies | Hardyston Quartzite |
Overlies | Chestnut Hill Formation |
Thickness | unknown |
Lithology | |
Primary | Schist |
Other | Gneiss and quartzite |
Location | |
Region | Piedmont of eastern North America |
Country | United States |
Extent | Southeastern Pennsylvania, northern Delaware, Northeastern Maryland |
Type section | |
Named for | The Wissahickon Creek |
Close
In Maryland formations, the term "Wissahickon" is no longer used. Rocks in this classification have since been divided into several units, such as Lower Pelitic Schist and Prettyboy Schist.[1]