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

Major Paleogene and Neogene fossiliferous stratigraphic units in Oregon
Pleistocene
Pliocene
Late Miocene
Early Miocene
Oligocene
Eocene
Paleocene

Group	Formation	Period	Notes
	Elk River Formation	Pleistocene Irvingtonian	[1]
	Port Orford Formation	Middle Pleistocene	[2]
	Merced Formation	Plio-Pleistocene	[3][4][5]
	Empire Formation	Tortonian-Zanclean	[6]
	Alkali Canyon Formation	Hemphillian	[7][8]
	Chalk Butte Formation	Hemphillian	[9][10][11]
	Drewsey Formation	Hemphillian	[12][13]
	McKay Formation	Hemphillian	[14][15][16]
	Juntura Formation	Clarendonian	[17]
	The Dalles Formation	Clarendonian	[18][19][20]
	Butte Creek Formation	Barstovian	[21]
	Deer Butte Formation	Barstovian	[22]
	Sucker Creek Formation	Barstovian	[23][24][25]
	Mascall Formation	Hemingfordian-Barstovian	[26]
	John Day Formation  John Day Fossil Beds National Monument	Late Eocene-Early Miocene (Duchesnean-Hemingfordian)	[27][28]
	Nye Formation	Chattian-Burdigalian (Arikareean-Hemingfordian)	[29]
Astoria	Astoria Shale	Oligocene	[30][31][32]
	Scotts Mills Formation	Chattian	[33]
	Yaquina Formation	Chattian	[34][35]
	Alsea Formation	Rupelian (Whitneyan)	[36][37]
	Fisher Formation	Rupelian	[38][39][40]
	Mehama Formation	Early Oligocene	[41][42]
	Pittsburg Bluff Formation	Priabonian-Chattian	[43][44][45]
	Keasey Formation	Priabonian-Rupelian	[46]
	Eugene Formation	Priabonian	[40][47][48]
	Nestucca Formation	Bartonian-Priabonian	[49]
	Spencer Formation	Bartonian	[50]
	Coaledo Formation	Bartonian	[51]
	Cowlitz Formation	Bartonian	[52][53]
	Clarno Formation  John Day Fossil Beds National Monument	Bridgerian-Duchesnean	[54][55]
	Tyee Formation	Ypresian-Lutetian	[56][57]
Umpqua	Camas Valley Formation	Ypresian	[58][59]
	Flournoy Formation	Lutetian	[60][61]
	Lookingglass Formation	Ypresian	[62][63]
	Roseburg Formation	Ypresian	[64][65]
	White Tail Ridge Formation	Ypresian	[66][67]
	Tenmile Formation	Ypresian	[68][69]
	Bushnell Rock Formation	Ypresian	[70][71]
	Yamhill Formation	Ypresian-Priabonian	[72][73]
	Siletz River Volcanics	Selandian-Ypresian	[74][75]

Mesozoic

Major Mesozoic and Permian fossiliferous stratigraphic units in Oregon
Cape Sebastian Sandstone
Chico Formation
Hudspeth Formation
Otter Point Formation
Nicely & Snowshoe Formations
Martin Bridge Limestone
Coyote Butte Limestone

Group	Formation	Period	Notes
	Cape Sebastian Sandstone	Campanian	[76][77]
	Chico Formation	Santonian-Campanian	[78][79]
	Hudspeth Formation	Albian	[80][81]
	Days Creek Formation	Valanginian-Barremian	[82][83]
Myrtle	Myrtle Formation	Valanginian-Hauterivian	[84]
	Dothan Formation	Berriasian-Valanginian	[85][86]
	Otter Point Formation	Tithonian-Berriasian	[87][88]
	Coon Hollow Formation	Oxfordian	[89][90]
	Lonesome Formation	mid Callovian	[91][92]
	Weberg Formation	Bajocian	[93][94]
	Snowshoe Formation	Toarcian-Bathonian	[95][96]
Mowich	Hyde Formation	early Toarcian	[97]
	Nicely Formation	late Pliensbachian	[98]
	Robertson Formation	late Pliensbachian	[99][100]
	Suplee Formation	late Pliensbachian	[101][102]
	Graylock Formation	Hettangian	[103]
	Hurwal Formation	Norian	[104]
	Martin Bridge Limestone	Carnian-Norian	[105][106]
	Vester Formation	Carnian-Norian	[107]
	Rail Cabin Argillite	Norian	[108]
	Brisbois Member	Carnian	[109][110]
Aldrich Mountains	Fields Creek Formation	Ladinian-Norian	[111][112]

Paleozoic

Group	Formation	Period	Notes
	Coyote Butte Limestone	Sakmarian-Kungurian	[113][114]

See also

• Paleontology in Oregon
• Lists of Oregon-related topics