Bridgeport & Gibbstown: Amber Rockhounding in Gloucester County, New Jersey

Quick details

Access

Public area

County

Gloucester County

State

New Jersey

Postcode

08027

Coordinates

39.83096, -75.30717

Geology at Bridgeport & Gibbstown

This spot sits on Magothy Formation, mapped as sand that formed roughly 86 to 84 million years ago. Loose deposits like these are float-collecting ground: erosion keeps moving durable rocks and minerals into gravel bars, cutbanks, and washes.

Mapped unit

Magothy Formation

Age

86–84 Ma (Late Cretaceous)

Rock types

sand

Elevation

0 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 Bridgeport & Gibbstown

Best months: March to December. Typical highs run 88°F in midsummer and 41°F in midwinter, with winter lows near 26°F.

Climate normals: NOAA 1991-2020 monthlies, PHILA INTL AP station (5 mi away).

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 Bridgeport & Gibbstown

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

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