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Oligocene igneous rocks in Oregon
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California
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Colorado
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Oregon
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Washington
Cenozoic
Paleogene
Neogene
Quaternary
Paleocene
Eocene
Oligocene
Miocene
Pliocene
Pleistocene
Holocene
Subcategories
This category has the following 3 subcategories, out of 3 total.
*
Oligocene volcanic rocks in Oregon
(1 C)
J
John Day Formation
(7 C, 10 F)
O
Oligocene volcanoes in Oregon
(2 C)