Crosswick’s Creek: Amber Rockhounding in Mercer County, New Jersey

Updated June 2026

Crosswick’s Creek is a mapped rockhounding spot in Mercer County, New Jersey. Reported finds include amber. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Mercer County
State: New Jersey
Nearest road: Longwood Drive
Postcode: 08620
Coordinates: 40.16662, -74.67064

Geology at Crosswick’s Creek

This spot sits on Merchantville Formation, mapped as sand that formed roughly 84 to 72 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: Merchantville Formation
Age: 84–72 Ma (Late Cretaceous)
Rock types: sand
Elevation: 40 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 Crosswick’s Creek

Best months: March to December. Typical highs run 87°F in midsummer and 41°F in midwinter, with winter lows near 22°F.

Climate normals: NOAA 1991-2020 monthlies, HIGHTSTOWN 2 W station (9 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 Crosswick’s Creek

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

Amber Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Crosswick’s Creek.

Across the state line from Crosswick’s Creek

Crosswick’s Creek is close enough to the New Jersey border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Crosswick’s Creek FAQ

Where is Crosswick’s Creek?+

Crosswick’s Creek is in Mercer County, New Jersey, at 40.16662, -74.67064. Nearest road: Longwood Drive.

What rocks and minerals can you find at Crosswick’s Creek?+

Crosswick’s Creek is reported to produce Amber.

Is collecting allowed at Crosswick’s Creek?+

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 Crosswick’s Creek?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Crosswick’s Creek?+

The most comfortable months at Crosswick’s Creek are March to December.

How do I get to Crosswick’s Creek?+

Open the directions link to navigate to 40.16662, -74.67064 in Google Maps. The nearest road is Longwood Drive.

More rockhounding in New Jersey

See all 72 New Jersey spots →

Open Crosswick’s Creek on the map

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