Recent Articles

Erosional History of the Sandy Run Drainage basin, Montgomery County, Pennsylvania

Introduction: Sandy Run is an interesting secondary drainage route as it drains the Chester Valley east end (also known as the Roslyn Valley) in a west-southwest direction, but instead of continuing a short distance further on the Chester Valley floor to join south oriented Wissahickon Creek, it turns in a north direction to flow through […]

The Red Clay Creek-White Clay Creek divide area near Kennett Square, PA

The divide between West Branch Red Clay Creek and the East Branch White Clay Creek near Kennett Square is crossed by at least two former west-southwest oriented water flow channels. The southern former channel east end is drained by a north, east-northeast and southeast oriented tributary to the West Branch Red Clay Creek while the […]

The Brandywine Creek-Red Clay Creek divide area near Longwood Gardens

Longwood Gardens near Kennett Square in Chester County is located on the drainage divide between Brandywine Creek to the east and Red Clay Creek to the west. A former east-to-west oriented water flow channel crosses the present-day Brandywine Creek-Red Clay Creek divide on the Longwood Gardens grounds on the north side of the main conservatory […]

Bucks County water gaps inventory by township

This inventory identifies Bucks County’s most obvious water gaps by township as seen on 1:24,000-scale United States Geological Survey topographic maps and is not complete. Bucks County streams cross rock layers of varying resistance to erosion and many less obvious water gaps exist. Only townships containing the most obvious water gaps are listed here. Bedminster […]

Bucks County barbed tributary and elbow of capture inventory by township

This inventory identifies most of each township’s obvious barbed tributaries and elbows of capture as seen on 1:24,000-scale United States Geological Survey topographic maps, but should not be regarded as being complete. Also many of the barbed tributaries and elbows of capture are best seen and understood by observing the evidence in an area much […]

Bucks County hill inventory by township

This inventory identifies each township’s most prominent hills, their elevations, and the nature of the bedrock forming the hill. Hills listed here are the named hills named on 1:24,000-scale United States Geological Survey topographic maps. Many Bucks County townships contained no named hills and if none were found that is indicated here Bedminster Township Relief […]

Bucks County through valley inventory by township

This inventory is an effort to identify each township’s most prominent through valley, or through valleys and many less prominent through valleys are not included. The through valleys provide evidence of former drainage routes that can best be explained in the context of massive and prolonged southwest oriented floods that were sequentially captured by headward […]

Guide to Landforms Seen Along the SEPTA Paoli-Thorndale Regional Rail Line

The Paoli-Thorndale Regional Rail Line is unique among the SEPTA Regional Rail Lines in that between Ardmore and Malvern it follows the Schuylkill-Delaware River drainage divide and further west crosses the Schuylkill-Delaware River divide along the Chester Valley south wall. The Paoli-Thorndale Regional Rail Line, which was originally the Pennsylvania Railroad main line and which […]

Guide to Landforms Seen Along SEPTA’s Lansdale-Doylestown Regional Rail Line

Overview: Along its 34.4-mile trip from Center City Philadelphia to Doylestown a SEPTA train travels from the Philadelphia City Center to and then along the Coastal Plain-Piedmont Province boundary before moving from the Coastal Plain onto the Piedmont to reach the Tookany Creek drainage basin. Once in the Tookany Creek valley the train travels in […]

Neshaminy Creek-Little Neshaminy Creek drainage divide area in Warrington Township, Bucks County, PA

Neshaminy Creek “meanders” in an east direction north of Warrington Township while Little Neshaming Creek flows in an east, southeast, and east direction through southern Warrington Township. Mill Creek is a significant northeast oriented Neshaminy Creek tributary originating in Warrington Township. The Neshaminy Creek-Little Neshaminy Creek drainage divide elevation northeast of Montgomeryville along the Montgomery-Bucks […]

Guide to Landforms Seen Along SEPTA’s West Trenton Regional Rail Line

Overview: Along its 32.5-mile trip from Center City Philadelphia to West Trenton a SEPTA West Trenton train travels from the Philadelphia City Center to and then along the Coastal Plain-Piedmont boundary before moving onto the Piedmont Province to reach the Tookany Creek drainage basin. Once in the Tookany Creek valley the train travels in a […]

Guide to Landforms Seen Along SEPTA’s Warminster Regional Rail Line

Overview: Along its 21-mile distance SEPTA’s Warminster Regional Rail line ascends from sea level to approximately 320 feet and crosses the Delaware-Schuylkill River drainage divide twice as it travels from the Tookany Creek drainage basin to the Wissahickon Creek drainage basin and then to the Pennypack Creek drainage basin. Along the way observant riders can […]

Crum Creek-Darby Creek drainage divide area near Newtown Square, Delaware County, PA

Crum Creek and Darby Creek both originate in the same region near Paoli and Berwyn just south of the Chester Valley south rim and diverge slightly before flowing in southeast and south-southeast directions to join the southwest oriented Delaware River at almost the same location. Both streams are joined by northeast oriented barbed tributaries from […]

Barbed tributaries and aligned drainage near Cheney, PA

Cheney, PA is located in an east oriented East Branch Chester Creek valley segment and is located a short distance downstream from the confluence of south-southeast oriented East Branch Chester Creek with southeast oriented Goose Creek and a short distance upstream from where the East Branch Chester Creek turns to flow again in a south-southeast […]