The Delintment Lake rockhounding area sits high in the Ochoco National Forest, about 50 miles northwest of Burns and 85 miles southeast of Prineville.

The surrounding hills consist of Middle Jurassic sandstone, shale, and siltstone. As these soft rocks break and peel, they reveal the story of an ancient sea. The textures and colors stand out best in early morning light or after a light rain.

The area is high and remote, with conditions that can change quickly. The best time to visit is from late May through September, when roads are generally clear.

Most routes consist of graded gravel and forest roads, including Hines Logging Road (CR 127) and Forest Road 41, which are passable for most vehicles in dry weather, though high clearance is recommended after rain.

Delintment Lake Fossil Hunting

The area yields marine fossils — especially ammonites and shell casts — from thin shale and siltstone layers exposed in road cuts and along eroded slopes. You’ll see gray-brown sheets that split like pages; that’s your cue to look closer.

Fossil impressions are common along the road cuts, especially where shale layers have fractured naturally. You can spot palm-sized spirals, and sometimes larger ones show right in the cut. Many fossils are revealed where stones have already split, showing clean imprints, while others require careful work. Use a hammer and chisel to open the thin, brittle shale along natural seams—gentle, controlled taps are far better than heavy blows.

Begin your search at the exposed cuts mentioned in the directions below, then follow Forest Road 41 to similar outcrops. The same beds repeat, so once their “look” is familiar, new locations can be spotted quickly.

Note: Shale edges are sharp, so gloves and eye protection are essential. Bring a rock hammer, chisel, and small pry bar, plus paper towels or foam for wrapping specimens.

Dispersed camping is allowed on National Forest land unless posted otherwise. For a relaxed base with water access, Delintment Lake Campground offers 24 standard sites plus 5 walk-in tent sites near an accessible fishing dock. It’s typically open from late May through mid-October.

Expect picnic tables, grills, non-flush toilets, drinking water, and a non-motorized boat launch. There are no hookups. Maximum vehicle length is about 30 feet, with trailers up to 20 feet. Nights can get cool, even in July, so bring layers.

For a quieter forest stay, Buck Spring Campground is within driving distance and keeps things simple — shady sites and easy access to nearby fishing around Delintment Lake.

If you prefer sleeping indoors, Burns and Hines offer affordable hotels, motels, and vacation rentals. Staging in town is convenient for topping off fuel, checking fire conditions, and downloading offline maps before heading up the forest roads.

Lodging in Burns and Hines

Affordable vacation rentals for short- and long-term stays in Hines

Best time: Late May through September
Managed by: U.S. Forest Service

Rocks & Minerals: Ammonites, shell casts, and other marine impressions in shale/siltstone

Tools: Rock hammer, cold chisel, safety glasses, gloves; small pry bar; newspaper/foam for wrapping
Activities: Rockhounding, fishing, camping, paddling, wildlife watching, short hikes

Road access: Any vehicle in the dry season
Day-use fees: None

Elevation: 5,600 ft (1,700 m)

Delintment Lake is located: