This differs chiefly from Lyell's classification in the introduction of the term Oligocene for the upper part of the original Eocene, which was somewhat unwieldy.    From Wordnik.com.  [The Antiquity of Man] Reference

These are Oligocene formations of gypsum and saline.    From Wordnik.com.  [Central Anatolian steppe] Reference

He has been dated to the Oligocene, 15 million years ago.    From Wordnik.com.  [Big Bird] Reference

Even the ants and bees have made no advance since the Oligocene.    From Wordnik.com.  [On Thursday, the Legg report will be published along with...] Reference

The pikas appear somewhat later, in the Oligocene of eastern Asia.    From Wordnik.com.  [Video: Kitteh Team-Up - Lolcats 'n' Funny Pictures of Cats - I Can Has Cheezburger?] Reference

CO2 concentrations during the Paleocene, Eocene and Oligocene eras.    From Wordnik.com.  [The Volokh Conspiracy » “Walking to the Shops ‘Damages Planet More Than Going By Car’”:] Reference

The Main Range volcanics are of late Oligocene to early Miocene age.    From Wordnik.com.  [Central Eastern Rainforest Reserves, Australia] Reference

It is underlain by Miocene, Oligocene, Eocene, and Paleocene sediments.    From Wordnik.com.  [Ecoregions of Texas (EPA)] Reference

The Tertiary sedimentary rocks are Eocene, Oligocene, Miocene, and Pliocene.    From Wordnik.com.  [Santa Cruz Mountains (Bailey)] Reference

Endemism is a consequence of evolution in isolated areas since the Oligocene.    From Wordnik.com.  [Argentine Monte] Reference

Oligocene and much of it near Alid has occurred within the last 1 million years.    From Wordnik.com.  [Alid project summary] Reference

New specimens of the early Oligocene Old World hummingbird Eurotrochilus inexpectatus.    From Wordnik.com.  [Hummingbird!] Reference

The feature article this issue are some Egyptian bats from the late Eocene and early Oligocene.    From Wordnik.com.  [Archive 2008-03-01] Reference

Dicerorhinus has a fossil history going back to the Miocene (and perhaps to the Late Oligocene).    From Wordnik.com.  [Are Sumatran rhinos really ‘living fossils’?] Reference

Formed during the Oligocene and Miocene epochs, the Alps are home to a high level of biodiversity.    From Wordnik.com.  [Alps conifer and mixed forests] Reference

These two periods, later designated Oligocene and Paleocene, were inserted into the Tertiary in their proper places.    From Wordnik.com.  [Cenozoic] Reference

The arch was formed as the uplift along the subduction of the Indian-Australian plate in the late Eocene or early Oligocene.    From Wordnik.com.  [Nicobar Islands rain forests] Reference

Although they are only found in the Americas today, their fossil record includes Europe and dates back to the Oligocene 1, 2.    From Wordnik.com.  [Hummingbird!] Reference

The Silurian period follows the Ordovician, and the Miocene epoch follows the Oligocene as surely as Wednesday follows Tuesday.    From Wordnik.com.  [Centennial]

The turbulent topography ranges from the sheer, highly dissected “Wall” to pastel-hued toeslopes laden with Oligocene fossils.    From Wordnik.com.  [Ecoregions of North Dakota and South Dakota (EPA)] Reference

Marshall Paraconformity: a mid-Oligocene record of inception of the Antarctic Circumpolar Current and coeval glacio-eustatic lowstand?.    From Wordnik.com.  [Think Progress » Senate Committee Launches Taxpayer-Funded Misinformation Campaign About Gore Movie] Reference

Geologically they are known to date back to the Oligocene period, and wings believed to be referable to them have been found in Liassic and Jurassic beds.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

The Oligocene cats, thirty million years ago, were already highly specialized, and the habits and physical characteristics of cats have been fixed since then.    From Wordnik.com.  [It’s like this, cat] Reference

The Eocene, or older Tertiary, further appears with nummulitic formations on both sides of the eastern Balkans; the Oligocene only near the Black Sea coast at Burgas.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary"] Reference

Oligocene period, the Oceanic series to the Miocene, the Bissex Hill marls to the Pliocene, and the coral limestones partly to the Pliocene and partly to the Pleistocene.    From Wordnik.com.  [Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3 "Banks" to "Bassoon"] Reference

In the late Oligocene (about 30 to 24 mya) fossils of central North America, more diverse grass fossils were found, including both archaic forms and quite a few living genera.    From Wordnik.com.  [Grasses] Reference

Oligocene - CO2 from 1500ppm down to 500ppm with cooling.    From Wordnik.com.  [WHAT REALLY HAPPENED] Reference

Fordyce RE (1980) Whale evolution and Oligocene southern ocean environments.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference

The time period in question, the Oligocene, is circled on this time chart from the.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

Major early Oligocene to early middle Miocene Afro-Arabian catarrhine primate sites.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

Later on during the late Eocene and subsequent Oligocene, around 20-something mya to.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

New Oligocene primate from Saudi Arabia and the divergence of apes and Old World monkeys.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

The well encountered hydrocarbon reserves at both the Miocene and the Oligocene intervals.    From Wordnik.com.  [Latest News - UPI.com] Reference

The Eocene and Oligocene Palaeo-Ecology and Palaeo-Geography of Whale Valley and Fayoum Basins.    From Wordnik.com.  [Wadi Al-Hitan (Whale Valley), Egypt] Reference

Shown here, Mint Spring Bayou falls over a ledge of Oligocene-age Glendon Limestone near Vicksburg.    From Wordnik.com.  [Ecoregions of Mississippi (EPA)] Reference

The tapir is a very archaic type of ungulate, not unlike the non - specialized beasts of the Oligocene.    From Wordnik.com.  [Through the Brazilian Wilderness] Reference

In Oligocene, 35 million years ago, Poebrotherium had the size of a roe deer, but already resembled a camel.    From Wordnik.com.  [Latest Articles] Reference