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Eocene Epoch: Quick Facts

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Coryphodon, a genus of primitive hoofed mammals known from Late Paleocene and Early Eocene deposits. Restoration painting by Charles R. Knight, 1898.
Map of the Pacific Ocean showing the age of selected regions of the seafloor, with color-coded bands representing different geological ages from Cretaceous (136 million years ago) to Pleistocene (0 million years ago). The map highlights mid-ocean ridges, deep ocean trenches, and fracture zones, with arrows indicating the direction of crustal plate spreading. Major trenches such as the Mariana, Peru-Chile, and Aleutian Trenches are labeled.
A detailed geologic time scale chart displaying Earth's history from the Hadean Eon over 4.5 billion years ago to the present, organized by eons, eras, periods, epochs, and ages with color-coded columns and corresponding dates in millions of years.
Chart showing the Paleogene period of the Cenozoic era on the geologic time scale, listing its epochs-Oligocene, Eocene, and Paleocene-each divided into stages with corresponding ages in millions of years ago.
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