What does oligocene mean?
The Oligocene is the third and final period of the Paleogene Epoch, which followed the Eocene and preceded the Miocene. It lasted from approximately 33.9 to 23 million years ago. As an adjective, Oligocene describes rocks, fossils, organisms, and events associated with this interval. The word is used mainly in geology, paleontology, archaeology, and evolutionary biology. During the Oligocene, mammals continued to diversify, major groups of modern mammals emerged, and changing climates transformed terrestrial and aquatic ecosystems. The name comes from Greek roots meaning “few” or “little” and “new,” reflecting the early scientific effort to describe relatively recent periods in Earth’s history. Its specialized vocabulary makes it especially useful to readers studying deep time and the development of life. Although the term is closely associated with formal scientific writing, it is also encountered in museum displays, popular accounts of prehistoric life, and discussions of fossils and climate history.
The third geological period of the Paleogene Epoch, extending from about 33.9 to 23 million years ago and preceding the Miocene.
"The Oligocene was marked by major changes in climate and widespread diversification among mammals."
The period’s name is normally capitalized and is often used without a preceding article in scientific contexts.
Relating to the Oligocene period or to rocks, fossils, organisms, or events belonging to that period.
"Scientists identified several Oligocene mammals from fossils recovered near the site."
Usually encountered in specialist writing about geology, paleontology, and evolutionary history.
The plural is uncommon. It may be used when distinguishing separate Oligocene intervals or referring to them comparatively.
"Researchers compared fossil assemblages from several Oligocenes."
Oligocene combines Greek words for “few” and “new,” a fitting name for an epoch when many modern mammal groups began to diversify.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does oligocene come from?
The name was formed in the 19th century from Greek oligos, meaning “few” or “little,” and the geological suffix -cene, which derives from Greek kainos, meaning “new.” Together, the elements convey the sense “little new” or “slightly recent.” The prefix element in related words such as oligarchy and oligopoly ultimately comes from the same Greek root.
How oligocene is actually used
This is primarily formal or scientific vocabulary. The name of the period is normally capitalized, while the adjective is also commonly capitalized in geological usage.
Easily confused with oligocene
The Eocene immediately precedes the Oligocene and lasted from about 56 to 33.9 million years ago.
The Miocene immediately follows the Oligocene and lasted from about 23 to 5.3 million years ago.