| Group or Formation |
Period |
Notes |
| Aldrich Mountains Group/Fields Creek Formation | Triassic | |
| Alkali Canyon Formation | Neogene | |
| Alsea Formation | Paleogene | |
| Astoria Formation | Neogene | |
| Astoria Formation | Paleogene | |
| Brisbois Formation | Triassic | |
| Butte Creek Volcanic Sandstone Formation | Neogene | |
| Chalk Butte Formation | Neogene | |
| Chico Formation | Cretaceous | |
| Clarno Formation | Paleogene | |
| Coaledo Formation | Paleogene | |
| Coon Hollow Formation | Jurassic | |
| Cowlitz Formation | Paleogene | |
| Coyote Butte Formation | Permian | |
| Coyote Butte Limestone Formation | Permian | |
| Days Creek Formation | Cretaceous | |
| Deer Butte Formation | Neogene | |
| Drewsey Formation | Neogene | |
| Elk River Formation | | |
| Empire Formation | Neogene | |
| Eugene Formation | Paleogene | |
| Graylock Formation | Jurassic | |
| Hudspeth Formation | Cretaceous | |
| Hurwal Formation | Triassic | |
| Hyde Formation | Jurassic | |
| John Day Formation | Neogene, Paleogene | |
| Juntura Formation | Neogene | |
| Keasey Formation | Paleogene | |
| Late Pleistocene terrace Formation | | |
| Lonesome Formation | Jurassic | |
| Lookingglass Formation | Paleogene | |
| Martin Bridge Formation | Triassic | |
| Mascall Formation | Neogene | |
| McKay Formation | Neogene | |
| Merced Formation | Neogene | |
| Mowich Group/Robertson Formation | Jurassic | |
| Myrtle Formation | Jurassic | |
| Myrtle Formation | Cretaceous | |
| Myrtle Group/Dotham Formation | Cretaceous | |
| Nestucca Formation | Paleogene | |
| Nicely Formation | Jurassic | |
| Nye Formation | Neogene, Paleogene | |
| Otter Point Formation | Jurassic | |
| Pittsburg FormationFormation | Paleogene | |
| Pittsburg Bluff Formation | Paleogene | |
| Port Orford Formation | | |
| Rail Cabin Argillite Formation | Triassic | |
| Scotts Mills Formation | Paleogene | |
| Snowshoe Formation | Jurassic | |
| Sucker Creek Formation | Neogene | |
| Suplee Formation | Jurassic | |
| The Dalles Formation | Neogene | |
| Tyee Formation | Paleogene | |
| Tyee Sandstone Formation | | |
| Umpqua Formation | Paleogene | |
| Umpqua Group/Bushnell Rock Formation | Paleogene | |
| Umpqua Group/Camas Valley Formation | Paleogene | |
| Umpqua Group/Tenmile Formation | Paleogene | |
| Umpqua Group/White Tail Ridge Formation | Paleogene | |
| Vester Formation | Triassic | |
| Weberg Formation | Jurassic | |
| Yaquina Formation | Paleogene | |
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