Oligocene Epoch: Stratigraphy

Subdivisions of the

The chart at left shows the major subdivisions of the Paleogene, the first portion of the Tertiary Period, including the Oligocene. You may click anywhere on the other Epochs or the arrows to navigate to those exhibits.

The Oligocene Epoch is part of the Cenozoic Era.

Find out more about the Tertiary paleontology and geology of North America at the Paleontology Portal.