Otter Rock & Devils Punch Bowl State Park: Agate & Jasper Rockhounding in Lincoln County, Oregon

Quick details

Access

Public area

County

Lincoln County

State

Oregon

Nearest road

1st Street

Postcode

97369

Coordinates

44.74629, -124.06230

Geology at Otter Rock & Devils Punch Bowl State Park

This spot sits on surficial deposits; Coastal terrace deposits, mapped as carbonaceous silt, sand, devitrification: devitrified ash beds; mineralogy: heavy minerals; wood-bearing zones fragments; lithology: carbonaceous silt, sandy mud, fossils: fossiliferous fossils, dune sand, and staining: iron stained; zones: soil zones that formed within roughly the last 3 million years. Fossils are uncommon in volcanic rock itself; look to any interbedded sediments and ash beds, where plant material and bone are typically preserved.

Mapped unit

surficial deposits; Coastal terrace deposits

Age

3 Ma to present (Quaternary)

Rock types

carbonaceous silt, sand, devitrification: devitrified ash beds; mineralogy: heavy minerals; wood-bearing zones fragments; lithology: carbonaceous silt, sandy mud, fossils: fossiliferous fossils, dune sand, and staining: iron stained; zones: soil zones

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 Otter Rock & Devils Punch Bowl State Park

Conditions here are workable year-round, with typical highs from 55°F in winter to 66°F in summer.

Climate normals: NOAA 1991-2020 monthlies, NEWPORT 3N station (4 mi away), adjusted for elevation.

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 Otter Rock & Devils Punch Bowl State Park

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

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