Eocene-Oligocene boundary.

The Eocene-Oligocene transition : = paradise lost by: (Language materials, printed)

From greenhouse to icehouse : = the marine Eocene-Oligocene transition / by: (Language materials, printed)

Marine fauna- Atlantic Coast Region.

Paleontology- Oligocene.

Marine fauna- Gulf Coast Region (U.S.)

Extinction (Biology)

Eocene-Oligocene boundary.

Paleontology- Eocene.

Marine fauna- Pacific Coast Region.