Tabby Creek: Tabbyite Rockhounding in Duchesne County, Utah

Quick details

Access

Check locally

County

Duchesne County

State

Utah

Coordinates

40.32970, -110.84597

Geology at Tabby Creek

This spot sits on Duchesne River Formation, undivided, mapped as sandstone, siltstone, flagstone, and pebble to boulder conglomerate that formed roughly 66 to 23 million years ago. Sedimentary rock like this erodes unevenly, so the most productive collecting is typically along fresh cuts, badland slopes, and active drainages.

Mapped unit

Duchesne River Formation, undivided

Age

66–23 Ma (Paleocene to Oligocene)

Rock types

sandstone, siltstone, flagstone, and pebble to boulder conglomerate

Elevation

7,740 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.

Land & collecting status

Confirm rules before collecting

Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ.

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 Utah — Rockhounding overview
• Utah Geological Survey — collecting guidelines
• SITLA — surface use rules
• Community submissions reviewed against published agency rules

Found at Tabby Creek

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

• Tabbyite