Cedar Mountain: Travertine Rockhounding in Park County, Wyoming

Quick details

Access

Public area

County

Park County

State

Wyoming

Coordinates

44.48968, -109.12630

Geology at Cedar Mountain

This spot sits on ground mapped as sedimentary that formed roughly 360 to 100 million years ago. Sedimentary rock like this erodes unevenly, so the most productive collecting is typically along fresh cuts, badland slopes, and active drainages.

Age

360–100 Ma (Mississippian to Early Cretaceous)

Rock types

sedimentary

Elevation

6,210 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 Cedar Mountain

Best months: March to October. Typical highs run 81°F in midsummer and 34°F in midwinter, with winter lows near 14°F.

Climate normals: NOAA 1991-2020 monthlies, CODY station (1 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 Wyoming
• Wyoming State Geological Survey
• Fossil Butte National Monument
• Community submissions reviewed against published agency rules

Found at Cedar Mountain

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

• Travertine