Oligocene
(Alaska) A full-grown male northern fur seal (Callorhinus ursinus).
(psychology) The perception of a group as a single entity, distinct from its members.
Not governable
(geology) Of a geologic epoch within the Paleogene period from about 34 to 23 million years ago; marked by the rapid evolution in a warm climate.
古生物学者は砂岩に埋まった漸新世の化石を調べた。
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