the Eocene (from the Greek. -EO – morning, dawn, and kainos, new), Eocene division (era), middle division (era) of the Paleogene system (period). Beginning approximately 56.5 million years ago, the end — 35.4 million years ago, duration of about 21 million years. The beginning of the Eocene was marked by a significant transgression of the sea and a very warm climate (thermal optimum for the whole Cenozoic). Disappearance as a result of the transgression of the rich fish shallow estuaries in South Titise resulted in cetaceans adapted to living in the open sea. On Ellesmere island in Arctic Canada was inhabited by crocodiles, marsupials, sherstokryly and other heat-loving animals. Mammalian fauna was largely endemic throughout the Eocene; the number of families of mammals has increased almost 2 times, there were many existing family (felids, mustelids, bear, horse, Soniya and others). Widely developed later, and rodents. In the middle and especially late Eocene, the climate gradually became colder. Cold connected with the formation of Circum-Antarctic current and a change in the mechanism of redistribution of heat from the tropics to high latitudes. The land came into the next cold epoch, which continues at the present time.

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