Blacks Fork Creek: Silicified Algae & Turritella Agate Rockhounding in Uinta County, Wyoming

Updated June 2026

Blacks Fork Creek is a mapped rockhounding spot in Uinta County, Wyoming. Reported finds include silicified algae, turritella agate, chalcedony, jasper, quartz, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Uinta County
State: Wyoming
Coordinates: 41.56833, -110.14136

Geology at Blacks Fork Creek

This spot sits on ground mapped as Alluvium that formed within roughly the last 129,000 years. Petrified wood typically travels as tough float, and worked gravels like these are exactly where weathered pieces tend to collect.

Mapped unit: Alluvium
Age: < 1 Ma (Late Pleistocene to Holocene)
Elevation: 6,300 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 Blacks Fork Creek

Best months: March to October. Typical highs run 86°F in midsummer and 34°F in midwinter, with winter lows near 15°F.

Climate normals: NOAA 1991-2020 monthlies, CHURCH BUTTES GAS PLT station (12 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 Blacks Fork Creek

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

Nearby rockhounding spots

Other rockhounding spots within driving distance of Blacks Fork Creek.

Across the state line from Blacks Fork Creek

Blacks Fork Creek is close enough to the Wyoming border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Blacks Fork Creek FAQ

Where is Blacks Fork Creek?+

Blacks Fork Creek is in Uinta County, Wyoming, at 41.56833, -110.14136.

What rocks and minerals can you find at Blacks Fork Creek?+

Blacks Fork Creek is reported to produce Silicified Algae, Turritella Agate, Chalcedony, Jasper, Quartz, Petrified Wood.

Is collecting allowed at Blacks Fork Creek?+

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. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Blacks Fork Creek?+

A rock hammer, sturdy gloves, and a padded bag cover petrified wood hunting. Most pieces are surface float, so walking slopes and washes beats digging.

When is the best time to visit Blacks Fork Creek?+

The most comfortable months at Blacks Fork Creek are March to October.

How do I get to Blacks Fork Creek?+

Open the directions link to navigate to 41.56833, -110.14136 in Google Maps. Some spots are remote, so check road conditions before driving out.

More rockhounding in Wyoming

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Open Blacks Fork Creek on the map

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