Ada: Petrified Wood Rockhounding in Ottawa County, Kansas

Quick details

Access

Public area

County

Ottawa County

State

Kansas

Nearest road

Nemaha Road

Postcode

67467

Coordinates

39.16005, -97.89930

Geology at Ada

This spot sits on Alluvium, mapped as sand, silt, and clay that formed within roughly the last 3 million 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

3 Ma to present (Pleistocene to Holocene)

Rock types

sand, silt, and clay

Elevation

1,330 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 Ada

Best months: February to June. Typical highs run 93°F in midsummer and 40°F in midwinter, with winter lows near 18°F.

Climate normals: NOAA 1991-2020 monthlies, MINNEAPOLIS station (11 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.

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

Found at Ada

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

• Petrified WoodEncyclopedia →