Mission: Fossil Hunting in Todd County, South Dakota

Updated July 2026

Mission is a mapped rockhounding spot in Todd County, South Dakota. Reported finds include opalized wood, agatized wood, fossils. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Permission required
County: Todd County
State: South Dakota
Nearest road: Soldier Creek Road
Postcode: 57570
Coordinates: 43.30657, -100.88280

Geology at Mission

This spot sits on Arikaree Group, mapped as siltstone and sandstone that formed roughly 34 to 5 million years ago. Sedimentary layers like these are where fossils are typically preserved, and fresh exposures after rain or in active cuts tend to produce best.

Mapped unit: Arikaree Group
Age: 34–5 Ma (Oligocene to Miocene)
Rock types: siltstone and sandstone
Elevation: 2,330 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 Mission

Best months: March to November. Typical highs run 88°F in midsummer and 35°F in midwinter, with winter lows near 13°F.

Climate normals: NOAA 1991-2020 monthlies, MISSION station (11 mi away), adjusted for elevation.

Land & collecting status

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

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 Mission

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 Mission.

Across the state line from Mission

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

Mission FAQ

Where is Mission?+

Mission is in Todd County, South Dakota, at 43.30657, -100.88280. Nearest road: Soldier Creek Road.

What rocks and minerals can you find at Mission?+

Mission is reported to produce Opalized Wood, Agatized Wood, Fossils.

Is collecting allowed at Mission?+

Permission required before collecting. Requires landowner or agency permission before any collecting. Do not enter without explicit authorization. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Mission?+

A rock hammer, a cold chisel, safety glasses, and newspaper or foam for wrapping finds cover most fossil ground. A trowel and a sieve help in soft exposures.

When is the best time to visit Mission?+

The most comfortable months at Mission are March to November.

How do I get to Mission?+

Open the directions link to navigate to 43.30657, -100.88280 in Google Maps. The nearest road is Soldier Creek Road.

More rockhounding in South Dakota

See all 43 South Dakota spots →

Open Mission on the map

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