Fabius River: Geode Digging in Lewis County, Missouri

Public accessBest spot7 mineralsLewis County, MissouriUpdated October 2026

Minerals reported: 7
Elevation: 530 ft
Best months: March to November

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.

Plan your visit

Generally open to casual rockhounding

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

Get directions View on Google Maps

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Access note: The land around this stretch of the Fabius is a private family farm, posted no trespassing, and the owner does not allow public access. Do not cross it from 275th Avenue or nearby roads. The streambed here is privately owned too: Missouri's float-stream rights cover floating, fishing, and wading, not crossing private land or collecting from the bed.

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.

Best time to visit Fabius River

35°J

40°F

52°M

64°A

74°M

83°J

87°J

85°A

79°S

66°O

52°N

40°D

Comfortable months (45 to 90°F highs)

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).

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.

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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.

Missouri Geological Survey
Mark Twain National Forest
Missouri State Parks rules
Community submissions reviewed against published agency rules

Found at Fabius River

Each name 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.

La GrangeLewis County, Missouri · 8 mi awayAgate, Chalcedony, Jasper
NewarkKnox County, Missouri · 19 mi awayCalcite, Chalcopyrite, Goethite
HannibalRalls County, Missouri · 26 mi awayMarcasite, Pyrite
Alexandria & WaylandClark County, Missouri · 27 mi awayGeode
New LondonRalls County, Missouri · 28 mi awaySilicified Conodont
SavertonRalls County, Missouri · 29 mi awayPyrite
Fox CityClark County, Missouri · 31 mi awayGeode, Calcite
KahokaClark County, Missouri · 33 mi awayGeode

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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