Greensburg: Petrified Wood Rockhounding in Westmoreland County, Pennsylvania

Quick details

Access

Public area

County

Westmoreland County

State

Pennsylvania

Nearest road

Horse Trail

Postcode

15662

Coordinates

40.32474, -79.47612

Geology at Greensburg

This spot sits on Casselman Formation, mapped as shale and clastic that formed roughly 325 to 300 million years ago. Sedimentary beds like these are the typical host for petrified and silicified wood, which weathers out as durable float on slopes and in washes.

Mapped unit

Casselman Formation

Age

325–300 Ma (Pennsylvanian)

Rock types

shale and clastic

Elevation

1,160 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 Greensburg

Best months: March to November. Typical highs run 82°F in midsummer and 37°F in midwinter, with winter lows near 20°F.

Climate normals: NOAA 1991-2020 monthlies, MT PLEASANT station (8 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 Greensburg

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

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