Philadelphia: Agate & Petrified Wood Rockhounding in Delaware County, Pennsylvania

Updated June 2026

Philadelphia is a mapped rockhounding spot in Delaware County, Pennsylvania. Reported finds include agate, petrified wood, chalcedony, chert, jasper, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Delaware County
State: Pennsylvania
Nearest road: Boy Scout Bridge
Postcode: 19080
Coordinates: 40.01301, -75.38954

Geology at Philadelphia

This spot sits on Felsic gneiss, mapped as gneiss that formed roughly 4600 to 540 million years ago. Metamorphic rock like this weathers into resistant float, and minerals that survive transport typically concentrate in nearby drainages.

Mapped unit: Felsic gneiss
Age: 4600–540 Ma (Precambrian)
Rock types: gneiss
Elevation: 270 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Philadelphia

Best months: March to December. Typical highs run 88°F in midsummer and 41°F in midwinter, with winter lows near 22°F.

Climate normals: NOAA 1991-2020 monthlies, NORRISTOWN station (7 mi away), adjusted for elevation.

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Philadelphia

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Philadelphia.

Across the state line from Philadelphia

Philadelphia is close enough to the Pennsylvania border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Philadelphia FAQ

Where is Philadelphia?+

Philadelphia is in Delaware County, Pennsylvania, at 40.01301, -75.38954. Nearest road: Boy Scout Bridge.

What rocks and minerals can you find at Philadelphia?+

Philadelphia is reported to produce Agate, Petrified Wood, Chalcedony, Chert, Jasper, Quartz.

Is collecting allowed at Philadelphia?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Philadelphia?+

A rock hammer, sturdy gloves, and a padded bag cover petrified wood hunting. Most pieces are surface float, so walking slopes and washes beats digging.

When is the best time to visit Philadelphia?+

The most comfortable months at Philadelphia are March to December.

How do I get to Philadelphia?+

Open the directions link to navigate to 40.01301, -75.38954 in Google Maps. The nearest road is Boy Scout Bridge.

More rockhounding in Pennsylvania

See all 88 Pennsylvania spots →

Open Philadelphia on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.