66,000,000 years ago today · Cretaceous–Paleogene boundarySunday, 6 September 2026 · Strictly scientific. Always sourced.
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Fossil teeth of the three known Rudiomys species from the late OligoceneFossil Finds
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Two New Rudiomys Species from Montana

Fossils from Montana and new material from Oregon expand a little-known late Oligocene rodent genus and support a cautious interpretation of habitat specialisation.

CheckedSource: New material and two new species of the poorly known rodent Rudiomys (Aplodontiidae: Meniscomyinae) from the late Oligocene John Day Formation of Oregon and the Renova Formation of Montana