Oligocene epoch


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Oligocene epoch

an epoch of the TERTIARY PERIOD occurring between 38 and 26 million years ago, when modern fauna and flora appeared and the rise of birds and mammals continued. Britain was still moving northwards. see GEOLOGICAL TIME.
References in periodicals archive ?
During the Oligocene epoch an acid igneous intrusive of batholith size intruded the Jurassic sediments and the Eocene andesites throughout the Barrancas subprovince.
In cooperation with BP, explorations will be conducted for several trillion cubic feet of gas reservoirs which date back to the Oligocene epoch, for which feasibility was proven in offshore fields in the company's concession areas.
The primates lived during the Oligocene epoch, which lasted from 34 to 23 million years ago.
He found that the layer of limestone formed 25 million years ago, during the Oligocene epoch, dipped under the southern tip of the Everglades; at its lowest point, other scientists had measured a magnetic field strength greater than 25 times that of the surrounding region.
In her research, Katz developed important theories on one of the most recent and dramatic climate change events that have occurred in recent geologic history - the transition from the greenhouse climate of the Eocene epoch to the "icehouse" or glacial conditions of the Oligocene epoch approximately 33.