New London: Silicified Conodonts Rockhounding in Ralls County, Missouri

Updated June 2026

New London is a mapped rockhounding spot in Ralls County, Missouri. Reported finds include silicified conodonts. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Ralls County
State: Missouri
Nearest road: Avenue of the Saints
Postcode: 63459
Coordinates: 39.60828, -91.40610

Geology at New London

This spot sits on Leemon Formation, Maquoketa Group, Cape Limestone, Kimmswick Limestone, Noix-Cyrene Limestone, Maquoketa Shale, mapped as limestone that formed roughly 470 to 445 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: Leemon Formation, Maquoketa Group, Cape Limestone, Kimmswick Limestone, Noix-Cyrene Limestone, Maquoketa Shale
Age: 470–445 Ma (Middle Ordovician to Late Ordovician)
Rock types: limestone
Elevation: 520 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 New London

Best months: March to November. Typical highs run 86°F in midsummer and 35°F in midwinter, with winter lows near 19°F.

Climate normals: NOAA 1991-2020 monthlies, HANNIBAL WTR WKS station (8 mi away), adjusted for elevation.

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 New London

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

Silicified Conodonts

Nearby rockhounding spots

Other rockhounding spots within driving distance of New London.

Across the state line from New London

New London 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.

New London FAQ

Where is New London?+

New London is in Ralls County, Missouri, at 39.60828, -91.40610. Nearest road: Avenue of the Saints.

What rocks and minerals can you find at New London?+

New London is reported to produce Silicified Conodonts.

Is collecting allowed at New London?+

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 New London?+

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 New London?+

The most comfortable months at New London are March to November.

How do I get to New London?+

Open the directions link to navigate to 39.60828, -91.40610 in Google Maps. The nearest road is Avenue of the Saints.

More rockhounding in Missouri

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Open New London on the map

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