One of the Tertiaryepochs of the Cenozoic era, lasting from about 55.5 to 33.7 mya; the first true primates (euprimates) occurred during the Eocene; the first identifiable bats and cats also appeared, while horses and camels were already common.
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epoch (... the Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, ...)
Gauss normal epoch (Long interval of geologic time (a chron) from 3.4 to 2.4 mya in which the polarity of the earth ...)
Grande Coupure (Massive extinction and/or replacement event during the late Eocene epoch (c.38 mya) during an ...)
normal polarity epoch (... polarity epoch. See Gauss normal epoch, Brunhes normal epoch, and paleomagnetisn.)
reversed polarity epoch (... reversed epoch, Matuyama reversed epoch. Cf. normal polarity epoch. See paleomagnetism.)