Tag archives for Marble Hall Through Valley

The Wissahickon Gorge: Philadelphia’s Unique and Magnificent Water Gap

Without question the deepest, longest, and most magnificent Wissahickon Creek water gap is the seven-mile long Wiisahickon Gorge eroded across a 420-foot high ridge of tightly folded metamorphic and igneous rocks and which is located entirely within the Philadelphia city limits. The erosion resistant ridge extends in an east-northeast direction across southeast Pennsylvania and is […]

Andorra Wind Gap

The Andorra Wind Gap links an east-northeast oriented tributary to the Wissahickon Gorge north entrance with a west-southwest oriented Schuylkill River tributary and has an elevation of 266 feet. To the south Schuylkill River-Wissahickon Creek drainage divide elevations rise to 420 feet before decreasing until Wissahickon Creek joins the Schuylkill River. To the north a […]

Wissahickon Gorge and Schuylkill Gorge barbed tributaries

Wissahickon Creek after flowing for approximately six miles in a south-southeast direction through the Wissahickon Gorge turns to flow in an east direction where it is joined by southwest oriented Monoshone Creek. But, instead of continuing in a south-southeast or east direction Wissahickon Creek makes an abrupt turn to flow in a southwest direction along […]