oligocene (a.) Of, pertaining to, or designating, certain strata which
occupy an intermediate position between the Eocene and Miocene periods.
oligocene (n.) The Oligocene period. See the Chart of Geology.
Chambers DictionaryChamber's 20th Century Dictionary📕
oligocene ol′i-gō-sēn, adj.
(geol.) pertaining to a division of the Tertiary series, the rocks
chiefly of fresh and brackish water origin, with intercalations of marine
beds. [Gr. oligos, little, kainos, new.]
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