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USGS 978, Duke Claim, Swan Lake

Idaho
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Next site in IdahoMontpelier · 9 mi

Can I collect here?

Pro
See who owns this land and whether it is claimedPro shows the owner, the claim on this spot and every claim within a mile.
Read the collecting rules by land type

Based on our latest records, with claims updated from the BLM on Oct 9, 2026. Land and claims can change quickly, so check before you go.

Minerals on record here

1 mineral

Recorded here: fossil.

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About USGS 978, Duke Claim, Swan Lake

USGS 978, Duke Claim, Swan Lake is a fossil collection site in Idaho, cataloged in the Paleobiology Database. Fossils here come from the Phosphoria Formation, dated to the Roadian (274.4–266.9 million years ago). The depositional environment is recorded as offshore ramp. Documented finds include Komiella ostiolata, Babylonites conoideus.

Geologic setting

Formation
Phosphoria
Geologic interval
Roadian
Age
274.4–266.9 Ma
Depositional environment
offshore ramp
Recorded occurrences
3
Locality notes

Swan Lake. Cap lime in north tunnel on north side of gulch, Duke claim.

Fossils found here

Komiella ostiolata
Strophomenata · Rugosochonetidae
Babylonites conoideus
Gastropoda · Omphalotrochidae

Records and references

Data: Paleobiology Database collection 108902 (CC BY 4.0) — view the source record

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Questions about USGS 978, Duke Claim, Swan Lake

Can you collect at USGS 978, Duke Claim, Swan Lake?

It depends on who owns the land and whether a mining claim covers it. BLM land usually allows hand collecting for personal use, national parks allow none, and private land needs the owner’s permission. Pro members see the owner and any claims at this spot.

What minerals are found at USGS 978, Duke Claim, Swan Lake?

Fossil.

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Source: Paleobiology Database.