Oligocene

The Paleogene Period (IPA: PAY-lee-ə-jeen, -⁠lee-oh-, PAL-ee-; also spelled Palaeogene or Palæogene) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period 66 Ma (million years ago) to the beginning of the Neogene Period 23.04 Ma.

The start of the Oligocene is marked by a notable extinction event called the Grande Coupure; it featured the replacement of European fauna with Asian fauna, except for the endemic rodent and marsupial families.

The caves are formed in Oligocene limestone.

From oldest to youngest the group is made up of the Chamberlain Pass and Chadron formations (late Eocene), the Brule Formation (Oligocene, deposited about 32 to 26 million years ago), and the Sharps Formation (latest Oligocene), which caps the park's highest peaks.

The Chicamocha Canyon started forming in the Early Oligocene, when Colombia was undergoing a tectonically active phase of the Andean orogeny.

The Gulf of Suez Rift is a continental rift zone that was active between the Late Oligocene (c.

Geological evidence suggests that volcanism in the area dates back to the Oligocene and Miocene, when the main volcanic arc was located 40 kilometres (25 mi) west in the Maricunga Belt.

Kinmen, much like the surrounding Chinese mainland, is predominantly composed of Cretaceous aged granite, with lesser amounts of Eocene-Oligocene sandstone, Miocene basalt and Pleistocene-Holocene conglomerate.

Volcanic activity of the McMurdo Volcanic Group is tied to continental rifting and commenced during the Oligocene.

The layers of color for which the site is named can be traced back to cycling periods of wet and dry climate conditions associated with the transition from the Eocene epoch to the cooler, more temperate Oligocene epoch.

The limestone was formed in the Oligocene period (around 22-30 million years old), a period in the geological history of New Zealand where most of the continent of Zealandia was submerged beneath shallow seas.

The cays are characterized by Early Miocene reefal limestone positioned upon Eocene-Oligocene volcanic rocks.

The islands were created during the Oligocene period 29 mya, from a large submarine volcano generated by the Canary hotspot and shaped by erosion and marine sedimentation.

The volcanic activity was the result of a continental hotspot that arose during the Oligocene and continued in some places until the Holocene, creating fumaroles, hot springs, mud pools and deposits of natron and sulfur.

Approximately 25 million years ago (late Oligocene time), the collision of the North American and Pacific tectonic plates uplifted the area along the Elkhorn Fault.