Oligocene
Videos
The Oligocene is a geologic epoch of the Paleogene Period that extends from about 33.9 million to 23 million years before the present. As with other older geologic periods, the rock beds that define t
Subdivisions of the Oligocene
Neotethys during the Oligocene (Rupelian, 33.9–28.4 mya)
Restoration of Nimravus (far left) and other animals from the Turtle Cove Formation
Paraceratherium restored next to Hyaenodon
Geologic time scale
Videos
The geologic time scale or geological time scale describes how geologic time is divided into standardised intervals. It uses the rock record together with the principles of chronostratigraphy to place
Sketch of the Succession of Strata and their Relative Altitudes (William Smith)
One example of an obsolete geological time scale (France, mid-1940s).
Marine sandglass MMM