Seal Rock State Recreation Site: Agate & Jasper Rockhounding in Lincoln County, Oregon

Quick details

Access

Public area

County

Lincoln County

State

Oregon

Nearest road

Oregon Coast Highway

Postcode

97376

Coordinates

44.49663, -124.08317

Geology at Seal Rock State Recreation Site

This spot sits on surficial deposits; Coastal terrace deposits, mapped as marine sand, fossils: wood fossils, and sand that formed within roughly the last 3 million years. Reworked sediments like these can carry fossils eroded from older beds upstream, typically as rolled bone fragments, teeth, and shell material.

Mapped unit

surficial deposits; Coastal terrace deposits

Age

3 Ma to present (Quaternary)

Rock types

marine sand, fossils: wood fossils, and sand

Elevation

70 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 Seal Rock State Recreation Site

Conditions here are workable year-round, with typical highs from 51°F in winter to 64°F in summer.

Climate normals: NOAA 1991-2020 monthlies, NEWPORT 1 SE 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.

State guidance last verified: April 1, 2026

• BLM Oregon/Washington — Rockhounding & mineral material
• Oregon Department of Geology and Mineral Industries (DOGAMI)
• Oregon Parks and Recreation Department — beach collecting rules
• Community submissions reviewed against published agency rules

Found at Seal Rock State Recreation Site

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

• AgateEncyclopedia →
• JasperEncyclopedia →
• Petrified WoodEncyclopedia →
• FossilsEncyclopedia →