title: List of fossiliferous stratigraphic units in Oregon
text: # List of fossiliferous stratigraphic units in Oregon
  
  This article contains a list of fossil-bearing stratigraphic units in the state of Oregon, U.S.
  
  ## Lists of fossiliferous stratigraphic units
  
  ### Cenozoic
  
  | Group | Formation | Period |
  | - | - | - |
  | | Elk River Formation | Pleistocene Irvingtonian |
  | | Port Orford Formation | Middle Pleistocene |
  | | Merced Formation | Plio-Pleistocene |
  | | Empire Formation | Tortonian-Zanclean |
  | | Alkali Canyon Formation | Hemphillian |
  | | Chalk Butte Formation | Hemphillian |
  | | Drewsey Formation | Hemphillian |
  | | McKay Formation | Hemphillian |
  | | Juntura Formation | Clarendonian |
  | | The Dalles Formation | Clarendonian |
  | | Butte Creek Formation | Barstovian |
  | | Deer Butte Formation | Barstovian |
  | | Sucker Creek Formation | Barstovian |
  | | Mascall Formation | Hemingfordian-Barstovian |
  | | John Day Formation John Day Fossil Beds National Monument | Late Eocene-Early Miocene (Duchesnean-Hemingfordian) |
  | | Nye Formation | Chattian-Burdigalian (Arikareean-Hemingfordian) |
  | Astoria | Astoria Shale | Oligocene |
  | | Scotts Mills Formation | Chattian |
  | | Yaquina Formation | Chattian |
  | | Alsea Formation | Rupelian (Whitneyan) |
  | | Fisher Formation | Rupelian |
  | | Mehama Formation | Early Oligocene |
  | | Pittsburg Bluff Formation | Priabonian-Chattian |
  | | Keasey Formation | Priabonian-Rupelian |
  | | Eugene Formation | Priabonian |
  | | Nestucca Formation | Bartonian-Priabonian |
  | | Spencer Formation | Bartonian |
  | | Coaledo Formation | Bartonian |
  | | Cowlitz Formation | Bartonian |
  | | Clarno Formation John Day Fossil Beds National Monument | Bridgerian-Duchesnean |
  | | Tyee Formation | Ypresian-Lutetian |
  | Umpqua | Camas Valley Formation | Ypresian |
  | Umpqua | Flournoy Formation | Lutetian |
  | Umpqua | Lookingglass Formation | Ypresian |
  | Umpqua | Roseburg Formation | Ypresian |
  | Umpqua | White Tail Ridge Formation | Ypresian |
  | Umpqua | Tenmile Formation | Ypresian |
  | Umpqua | Bushnell Rock Formation | Ypresian |
  | | Yamhill Formation | Ypresian-Priabonian |
  | | Siletz River Volcanics | Selandian-Ypresian |
  
  ### Mesozoic
  
  | Group | Formation | Period |
  | - | - | - |
  | | Cape Sebastian Sandstone | Campanian |
  | | Chico Formation | Santonian-Campanian |
  | | Hudspeth Formation | Albian |
  | | Days Creek Formation | Valanginian-Barremian |
  | Myrtle | Myrtle Formation | Valanginian-Hauterivian |
  | Myrtle | Dothan Formation | Berriasian-Valanginian |
  | | Otter Point Formation | Tithonian-Berriasian |
  | | Coon Hollow Formation | Oxfordian |
  | | Lonesome Formation | mid Callovian |
  | | Weberg Formation | Bajocian |
  | | Snowshoe Formation | Toarcian-Bathonian |
  | Mowich | Hyde Formation | early Toarcian |
  | Mowich | Nicely Formation | late Pliensbachian |
  | Mowich | Robertson Formation | late Pliensbachian |
  | Mowich | Suplee Formation | late Pliensbachian |
  | | Graylock Formation | Hettangian |
  | | Hurwal Formation | Norian |
  | | Martin Bridge Limestone | Carnian-Norian |
  | | Vester Formation | Carnian-Norian |
  | | Rail Cabin Argillite | Norian |
  | | Brisbois Member | Carnian |
  | Aldrich Mountains | Fields Creek Formation | Ladinian-Norian |
  
  ### Paleozoic
  
  | Group | Formation | Period | Notes |
  | - | - | - | - |
  | | Coyote Butte Limestone | Sakmarian-Kungurian | |
  