Buffalo: Agate & Chalcedony Rockhounding in Harper County, Oklahoma

Updated June 2026

Buffalo is a mapped rockhounding spot in Harper County, Oklahoma. Reported finds include agate, chalcedony, chert, jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Check locally
County: Harper County
State: Oklahoma
Nearest road: US 64;US 183
Postcode: 73834
Coordinates: 36.84990, -99.62775

Geology at Buffalo

This spot sits on Blaine Formation, mapped as gypsum, dolostone, and shale that formed roughly 300 to 250 million years ago. Chert and agate nodules typically form inside carbonate rock like this and weather out as tough, waxy lumps in soils and creek beds.

Mapped unit: Blaine Formation
Age: 300–250 Ma (Permian)
Rock types: gypsum, dolostone, and shale
Elevation: 1,790 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 Buffalo

Best months: September to May. Typical highs run 96°F in midsummer and 50°F in midwinter, with winter lows near 22°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, BUFFALO 1SW MESONET station (1 mi away).

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.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Buffalo

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 Buffalo.

Across the state line from Buffalo

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

Buffalo FAQ

Where is Buffalo?+

Buffalo is in Harper County, Oklahoma, at 36.84990, -99.62775. Nearest road: US 64;US 183.

What rocks and minerals can you find at Buffalo?+

Buffalo is reported to produce Agate, Chalcedony, Chert, Jasper.

Is collecting allowed at Buffalo?+

Confirm rules before collecting. Land status here is not confirmed. Verify with the managing agency before collecting — federal, state, and tribal rules differ. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Buffalo?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Buffalo?+

The most comfortable months at Buffalo are September 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 Buffalo?+

Open the directions link to navigate to 36.84990, -99.62775 in Google Maps. The nearest road is US 64;US 183.

More rockhounding in Oklahoma

See all 36 Oklahoma spots →

Open Buffalo on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.