Quarry: Fossil Hunting in Grand Isle County, Vermont

Plan your visit

Generally open to casual rockhounding

County

Grand Isle County

State

Vermont

Nearest road

Summit Road

Postcode

05440

Coordinates

44.90594, -73.29845

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Best time to visit Quarry

Comfortable months (45 to 90°F highs)

Best months: April to November. Typical highs run 82°F in midsummer and 28°F in midwinter, with winter lows near 10°F.

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

Geology at Quarry

This spot sits on Stony Point Formation, mapped as shale and limestone that formed roughly 460 to 445 million years ago. Limestone like this typically forms in ancient seas, so marine fossils such as brachiopods, corals, and crinoids tend to weather out of fresh exposures.

Mapped unit

Stony Point Formation

Age

460–445 Ma (Late Ordovician)

Rock types

shale and limestone

Elevation

140 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.

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.

• Vermont Geological Survey
• Green Mountain National Forest
• Vermont State Parks, Camp Plymouth
• Community submissions reviewed against published agency rules