The Wissahickon Formation is a mapped bedrock unit in Pennsylvania, New Jersey, and Delaware.

The existence of the minerals biotite, garnet, staurolite, and kyanite all imply a low-intermediate to high metamorphic grade.

The sediments of the Wissahickon were altered during the Taconic orogeny and most dates do not place the deformation older than the Silurian.

The type described here has been the restricted Wissahickon, or its easternmost section that exists in the City of Philadelphia and eastern Delaware County.

Cuba Wissahickon are two units described in western Delaware and Chester Counties, Pennsylvania.