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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. 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 ...
Wissahickon Creek is a tributary of the Schuylkill River in Montgomery and Philadelphia Counties, Pennsylvania. [1]Wissahickon Creek rises in Montgomery County, runs approximately 23 miles (37 km) passing through and dividing Northwest Philadelphia before emptying into the Schuylkill River at Philadelphia.
Llewellyn Formation: φl Pennsylvanian Pottsville Formation: φp Mississippian: Mauch Chunk Formation: Mmc Mississippian Pocono Formation (Burgoon Formation) Mp (Mb) Mississippian/Devonian Spechty Kopf Formation: Mississippian/Devonian Rockwell Formation: Mississippian/Devonian Huntley Mountain Formation: Devonian: Catskill Formation: Dck ...
These rocks eventually provided the platform for the deposition of sediment that would become the Wissahickon Formation during a rifting of Rodinia. Sea floor spreading continued until a passive margin developed along the new Iapetus Ocean and a beach strandline developed. These sediments eventually became the Chickies Formation. [8]
Wissahickon, Philadelphia, a section or neighborhood of Philadelphia; Wissahickon Creek, a tributary of the Schuylkill River Wissahickon Memorial Bridge, spans the above creek in Philadelphia; Wissahickon Trail, a suburban trail; Wissahickon Formation, a mapped bedrock unit in Pennsylvania, New Jersey, and Delaware
The oldest layer, the Potomac Formation also contains some scattered lignite. As recently as five million years ago, much of present-day Delaware was submerged as the floor of a shallow sea, the Salisbury Embayment ; only with the retreat of global sea levels in recent geologic times did the coastal plain areas of the state emerge as dry land.
The Wissahickon also contains oligoclase-mica schist, hornblende and augen gneiss', and some feldspar. It then passes through a region of Pensauken and Bridgeton Formations, from the Tertiary, but it has eroded through it to the underlying Wissahickon Formation. Both formations consist of quartz sand.
The intrusive suite was originally mapped as the Norbeck Quartz Diorite by Hopson, [1] and is shown as such on the Geologic Map of Maryland of 1968. [2] A. A. Drake later revised the name after more detailed mapping. [3] It intrudes through the Wissahickon Formation.