[ US /ˈiəˌsin/ ]
  1. from 58 million to 40 million years ago; presence of modern mammals
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How To Use Eocene In A Sentence

  • The first cycle initiated in the early Paleocene and represents a transition from Cretaceous marine turbidites and shales to subaerial fluvial sandstones and conglomerates.
  • More specifically, there are Triassic, Jurassic, Cretaceous, Eocene, and Miocene marine and Oligocene and Plio-Pleistocene nonmarine sedimentary rocks. Santa Monica Mountains (Bailey)
  • The sediments comprise silts, sand, gravel and, often lenticular, silty clay, comparable with similar sediments in the Petrockstowc basin, where the bulk of the deposits are Eocene.
  • The nominated area contains most of the key interrelated and interdependent elements in their natural relationships which provide a robust foundation for reconstructing the mosaic of paleoenvironments and palaeogeography of a southern coastal realm of the ancient Tethyan Ocean during Eocene time, enabling interpretation of how animals then lived and how they were related to each other. Wadi Al-Hitan (Whale Valley), Egypt
  • The bulk of the sediments on the outer margin are of Eocene to Oligocene age with thin units of younger sediments on top.
  • Post-Jurassic mammal-like reptile from the Palaeocene. Archive 2006-05-01
  • By the end of the Eocene, modern orders and families replaced the archaic fauna of mostly extinct groups with no living descendants.
  • The skeletal morphology of monticular zooids in H. portelli suggests that specialized male polymorphs may not have evolved by Late Eocene times.
  • Also, other microfossils such as diatoms, radiolaria, and planktonic and benthic foraminifera are useful in certain parts of the Palaeocene.
  • Some 55 million years ago, during a period called the Palaeocene-Eocene thermal maximum, the average temperature increased by 13 degrees over 10,000 years. New Bork, New York
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