Btwn Groveton & Trinity: Agate & Chalcedony Rockhounding in Trinity County, Texas

Updated June 2026

Btwn Groveton & Trinity is a mapped rockhounding spot in Trinity County, Texas. Reported finds include agate, chalcedony, jasper, petrified wood. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Trinity County
State: Texas
Coordinates: 31.03313, -95.22204

Geology at Btwn Groveton & Trinity

This spot sits on Manning Formation, mapped as sandstone mudstone that formed roughly 38 to 34 million years ago. Sedimentary beds like these are the typical host for petrified and silicified wood, which weathers out as durable float on slopes and in washes.

Mapped unit: Manning Formation
Age: 38–34 Ma (Late Eocene)
Rock types: sandstone mudstone
Elevation: 230 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 Btwn Groveton & Trinity

Best months: October to May. Typical highs run 96°F in midsummer and 63°F in midwinter, with winter lows near 39°F. Summer heat here is intense, so carry more water than you think you need and work the early morning.

Climate normals: NOAA 1991-2020 monthlies, GROVETON station (12 mi away).

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

Texas Parks and Wildlife Department
Bureau of Economic Geology — Texas geology
Big Bend National Park — Rules
Community submissions reviewed against published agency rules

Found at Btwn Groveton & Trinity

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 Btwn Groveton & Trinity.

Btwn Groveton & Trinity FAQ

Where is Btwn Groveton & Trinity?+

Btwn Groveton & Trinity is in Trinity County, Texas, at 31.03313, -95.22204.

What rocks and minerals can you find at Btwn Groveton & Trinity?+

Btwn Groveton & Trinity is reported to produce Agate, Chalcedony, Jasper, Petrified Wood.

Is collecting allowed at Btwn Groveton & Trinity?+

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 Btwn Groveton & Trinity?+

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 Btwn Groveton & Trinity?+

The most comfortable months at Btwn Groveton & Trinity are October to May. Summer heat here is intense, so carry more water than you think you need and work the early morning.

How do I get to Btwn Groveton & Trinity?+

Open the directions link to navigate to 31.03313, -95.22204 in Google Maps. Some spots are remote, so check road conditions before driving out.

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Open Btwn Groveton & Trinity on the map

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