Recent Articles

The Chester Valley Drainage Divide between the Delaware and Schuylkill River

The Chester Valley is a narrow lowland extending from near the southeast oriented Susquehanna River valley in an east-northeast direction almost to the southeast oriented Schuylkill River valley. The Pennsylvania Geologic Survey web applications map shows the Chester Valley to be underlain by easily eroded carbonate rocks. The Chester Valley north rim (North Valley Hills) […]

Water and Wind Gaps near Christiana, Pennsylvania

Christiana is a small community located about 50 miles west of Philadelphia and just north of a water gap where East Branch Octoraro Creek headwaters cross the North Valley Hills. South of that water gap the East Branch Octoraro Creek flows across the east-northeast oriented Chester Valley and then flows through another water gap as […]

Chester Valley between Buck Run and West Branch Brandywine Creek

The Chester Valley between Parkesburg and Coatesville is an east-northeast oriented segment of a much longer through valley and includes the drainage divide between south oriented Buck Run at Pomeroy and south oriented West Branch Brandywine Creek at Coatesville. West Branch Brandywine Creek flows from the 600-700 foot high North Valley Hills (north of the […]

Chester Valley between Coatesville and Downingtown

The Chester Valley between Coatesville and Dowingtown is an east-northeast oriented through valley linking south oriented West Branch Brandywine Creek with south oriented East Branch Brandywine Creek. West Branch Brandywine Creek flows from the 500-600 foot high North Valley Hills (north of the Chester Valley) to enter and cross the less than 350-foot high Chester […]

Drainage Divide Between the East and West Branches Brandywine Creek Located West of West Chester

West of the City of West Chester, Pennsylvania the East Branch Brandywine Creek flows in a south-southeast and southwest direction to join southeast, northeast, and southeast oriented West Branch Brandywine Creek and to form southeast oriented Brandywine Creek. Broad Run is a southeast, east, and south-southeast oriented West Branch Brandywine Creek tributary located between the […]

Chester Valley between East Brandywine Creek and Valley Creek

Figure 1: Chester Valley segment between Valley Creek and East Brandywine Creek showing East Brandy Creek and Valley Creek valleys in the South Valley Hills. United States Geological Survey map digitally presented using National Geographic TOPO software.   One the Philadelphia region’s most easily recognized landforms is the Chester Valley, which extends in an east-northeast direction […]

Buckingham Mountain, Bucks County, PA

Figure 1: Buckingham Mountain region in Bucks County, PA. United States Geological Survey topographic map digitally presented using National Geographic TOPO software. Buckingham Mountain in Bucks County is a high southwest-to-northeast oriented ridge (more than 500 feet at its highest point while surrounding landscape elevations are in the 200-300 foot range). According to the Pennsylvania […]

Delaware Bay: Philadelphia’s Estuary or Drowned River Valley

Figure 1: Delaware Bay extends from northeast of Philadelphia to Cape May and is a drowned river valley. United States Geological Survey map digitally presented using National Geographic TOPO software. Delaware Bay is the flooded lower Delaware River valley or an estuary that extends upstream from south of Cape May, New Jersey almost to Trenton, […]

Jericho Mountain, Bucks County, PA

Figure 1: Jericho Mountain in Bucks County, PA. Bowman Hill is located north of the Jericho Mountain northeast end. The Delaware River flows in a southeast direction across the figure 1 northeast corner. Jericho Creek flows in an east-southeast and east-northeast direction along the Jericho Mountain south flank. Pidcock Creek drains the area north of […]

Solebury Mountain, Bucks County, Pa

Figure 1: Solebury Mountain in Bucks County, PA. The Delaware River flows in a south and southeast direction in a water gap eroded between Solebury Mountain and Goat Hill. United States Geological Survey topographic map digitally presented using National Geographic TOPO software. Solebury Mountain is a high ridge (more than 480 feet at its highest […]

Bowman Hill at Washington Crossing Historic Park

Figure 1: Bowman Hill at Washington Crossing Historic Park. The Delaware River flows in a southeast direction in the water gap it eroded between Bowman Hill and Belle Mountain. United States Geological Survey topographic map digitally presented using National Geographic TOPO software. Bowman Hill is a high point (over 400 feet while the adjacent Delaware […]

Mill Creek-Pidcock Creek drainage divide and Pidcock Creek drainage basin origin

The Pidcock Creek drainage basin is located east of Doylestown in Bucks County and is bounded on the southwest by the southeast and south oriented Mill Creek drainage basin, the northwest by Buckingham Mountain, the north by Solebury Mountain, the northeast by the southeast oriented Delaware River, and the south and southeast by Bowman Hill […]

Aquetong Creek-Lahaska Creek Drainage Divide area, Solebury Township, Bucks County

Northeast oriented Aquetong Creek headwaters originate north and east of Lahaska, Pa area and eventually reach the south oriented Delaware River while south and south-southwest oriented Lahaska Creek flows just west and south of Lahaska to reach Mill Creek and then Neshaminy Creek, which eventually flows to a southwest oriented Delaware River segment. Through valleys […]

Watson Creek Elbows of Capture and Water Gaps East of Doylestown

Watson Creek is a relatively minor stream located east of Doylestown and flows in a south and northeast direction to join southeast oriented Mill Creek, which then joins southeast and south oriented Neshaminy Creek. In its short distance Watson Creek passes through two water gaps and abruptly changes direction at an elbow of capture. The […]

Delaware River Elbows of Capture Between Bulls Island and Hendrick Island

The Delaware River flows in a south and southeast direction to Bulls Island and then turns to flow in an east-northeast direction for approximately one mile to Hendrick Island before turning to again flow in a southeast and south direction. Delaware River tributaries from the northeast are aligned in a southwest direction while tributaries from […]

Paunnacussing Creek-Pine Run Through Valley

The Paunnacussing Creek-Pine Run Through Valley is located a short distance north and east of Doylestown and links northeast oriented Paunnacussing Creek drainage with southwest oriented Pine Run drainage. Paunnacussing Creek flows in a northeast direction to join the south oriented Delaware River as a barbed tributary. Pine Run flows in a southwest direction to […]