4 miles west of Rio Blanco is a fossil collection site in Colorado, cataloged in the Paleobiology Database. Fossils here come from the Green River Formation, dated to the Uintan (45.9–39.7 million years ago). The depositional environment is recorded as lacustrine - large and the tectonic setting is intermontane basin. Documented finds include Plecia akerionana.

Geologic setting

Formation: Green River
Geologic interval: Uintan
Age: 45.9–39.7 Ma
Depositional environment: lacustrine - large
Tectonic setting: intermontane basin
Recorded occurrences: 1

Fossils found here

Plecia akerionana

Insecta · Bibionidae

Records and references

Data: Paleobiology Database collection 138790 (CC BY 4.0) — view the source record

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Questions about 4 miles west of Rio Blanco

Can you collect at 4 miles west of Rio Blanco?

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 4 miles west of Rio Blanco?

Fossil.

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What to bring

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Source: Paleobiology Database.