Gleason Cover: Jasper Rockhounding in Washington County, Maine

Quick details

Access

Permission required

County

Washington County

State

Maine

Nearest road

Sipayik Trail

Postcode

04667

Coordinates

44.96770, -67.05933

Geology at Gleason Cover

This spot sits on Perry Formation, sandstone member, mapped as sandstone that formed roughly 420 to 360 million years ago. Tough silica like agate, jasper, and chert typically weathers out of beds like these and collects as float in drainages and on deflation surfaces.

Mapped unit

Perry Formation, sandstone member

Age

420–360 Ma (Devonian)

Rock types

sandstone

Elevation

20 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 Gleason Cover

Best months: April to November. Typical highs run 75°F in midsummer and 31°F in midwinter, with winter lows near 15°F.

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

Land & collecting status

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

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.

State guidance last verified: April 1, 2026

• Maine Geological Survey
• Maine Mineral & Gem Museum
• Acadia National Park rules
• Community submissions reviewed against published agency rules

Found at Gleason Cover

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

• JasperEncyclopedia →