Definition of Paleogene in US English:



  • 1Relating to or denoting the earlier division of the Tertiary period, comprising the Paleocene, Eocene, and Oligocene epochs.

    The Paleogene lasted from about 65 million to 23 million years ago. The mammals diversified following the demise of the dinosaurs, and many bizarre and gigantic forms appeared

    Compare with Neogene
    • ‘The contact between Cretaceous Chalk and Palaeogene siliciclastic sediments is a megasequence boundary within the fill of the Wessex Basin.’
    • ‘Thick Permian to Paleogene continental rise deposits merge southward into a continuous Ordovician to Eocene shelf sedimentary succession of marine carbonates, sandstone, siltstone and shale.’
    • ‘The Bishri area was part of the Palmyride aulacogen from Late Palaeozoic until Paleogene time, accumulating thousands of metres of clastic and carbonate strata.’
    • ‘The sequence overlies Upper Triassic to Upper Cretaceous rocks and locally covers Palaeogene karst bauxite deposits.’
    • ‘The preserved Miocene sediments have allowed us to separate the effects of Palaeogene and Neogene uplift.’
    1. 1.1as noun the Paleogene The Paleogene subperiod or the system of rocks deposited during it.


Late 19th century: from paleo- + Greek genēs ‘of a specified kind’ (see -gen).