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Fabius River: Geode Digging in Lewis County, Missouri

Updated June 2026

The Fabius River drainage in Lewis County cuts through the Warsaw Formation on the southern margin of the Keokuk geode belt, releasing geodes lined with quartz, calcite, aragonite, and trace sulfides into the river gravels. It extends the famous Clark County geode beds a county south and gives collectors a second, less-crowded drainage to work. Geodes here range from golf-ball size to grapefruit size. Reported finds include geode, calcite, malachite, pyrite, quartz, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Fabius River photos

Public image records connected to this spot or its reported material.

1 photo

A Keokuk geode shown as an unbroken nodule beside its quartz crystal lined interior cavity, like the geodes that wash out of the Warsaw Formation into the Fabius River gravels.

Quick details

Access: Public area
County: Lewis County
State: Missouri
Nearest road: 275th Avenue
Postcode: 63454
Coordinates: 39.97556, -91.62179

Geology at Fabius River

This spot sits on ground mapped as limestone that formed roughly 360 to 325 million years ago. Limestone country like this is classic geode ground: cavities in the carbonate rock can line themselves with quartz or calcite crystals.

Age: 360–325 Ma (Mississippian)
Rock types: limestone
Elevation: 530 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 Fabius River

Best months: March to November. Typical highs run 87°F in midsummer and 35°F in midwinter, with winter lows near 19°F.

Climate normals: NOAA 1991-2020 monthlies, QUINCY DAM 21 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 Fabius River

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 Fabius River.

Across the state line from Fabius River

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

Fabius River FAQ

Where is Fabius River?+

Fabius River is in Lewis County, Missouri, at 39.97556, -91.62179. Nearest road: 275th Avenue.

What rocks and minerals can you find at Fabius River?+

Fabius River is reported to produce Geode, Calcite, Malachite, Pyrite, Quartz, Sphalerite, Aragonite.

Is collecting allowed at Fabius River?+

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 Fabius River?+

Bring a crack hammer, a chisel, safety glasses, and a bucket. Candidates are rounder and lighter than solid rock; a soil pipe cutter opens them cleaner than a flat smash.

When is the best time to visit Fabius River?+

The most comfortable months at Fabius River are March to November.

How do I get to Fabius River?+

Open the directions link to navigate to 39.97556, -91.62179 in Google Maps. The nearest road is 275th Avenue.

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