#fossilfriday a skull of the coyote-sized Oligocene dog Mesocyon. Found in the John Day formation of Oregon. On display at the Oregon Museum of Natural and Cultural History, Eugene.

#oregonmuseumofnaturalandculturalhistory #universityoforegon #prehistoricoregon #dog

#fossilfriday skull of the sheep-sized oreodont Mesoreodon. On display in the Thomas Condon Paleontology Center, John Day Fossil Beds National Monument, Oregon

#johndayfossilbedsnationalmonument #johndayfossilbeds #nationalmonument #prehistoricoregon #oregon #cenozoic #oligocene #paleontology

Third installment of #maystodon2026 is the skull of the middle miocene Miomastodon. Was on display at the Oregon Muaeum of Science and Industry, Portland (don't if it still is).

#fossilfriday #oregonmuseumofscienceandindustry #mastodon #prehistoricoregon

Week 3 of #maystodon2025 : a partial tusk of the early mastodon Zygolophodon. On Display at the Thomas Condon Paleontology Center, John Day Fossil Beds National Monument, Oregon.

#maystodon #johndayfossilbeds #nationalmonument #prehistoricoregon #elephant #mastodon #tusk