Grindstone Creek: Calcite Rockhounding in DeKalb County, Missouri

Updated June 2026

Grindstone Creek is a mapped rockhounding spot in DeKalb County, Missouri. Reported finds include calcite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: DeKalb County
State: Missouri
Nearest road: MO C
Coordinates: 39.78146, -94.28708

Geology at Grindstone Creek

This spot sits on Kansas City Group, mapped as limestone and shale that formed roughly 325 to 300 million years ago. Carbonate rock like this dissolves and weathers readily, so fresh road cuts, quarries, and creek exposures are typically the most productive ground.

Mapped unit: Kansas City Group
Age: 325–300 Ma (Pennsylvanian)
Rock types: limestone and shale
Elevation: 890 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 Grindstone Creek

Best months: March to November. Typical highs run 88°F in midsummer and 36°F in midwinter, with winter lows near 16°F.

Climate normals: NOAA 1991-2020 monthlies, CAMERON station (3 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 Grindstone Creek

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

Calcite Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Grindstone Creek.

Across the state line from Grindstone Creek

Grindstone Creek 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.

Grindstone Creek FAQ

Where is Grindstone Creek?+

Grindstone Creek is in DeKalb County, Missouri, at 39.78146, -94.28708. Nearest road: MO C.

What rocks and minerals can you find at Grindstone Creek?+

Grindstone Creek is reported to produce Calcite.

Is collecting allowed at Grindstone Creek?+

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 Grindstone Creek?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Grindstone Creek?+

The most comfortable months at Grindstone Creek are March to November.

How do I get to Grindstone Creek?+

Open the directions link to navigate to 39.78146, -94.28708 in Google Maps. The nearest road is MO C.

More rockhounding in Missouri

See all 94 Missouri spots →

Open Grindstone Creek on the map

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