Categories: ‪Geology stubs‬ | ‪Paleocene‬ The Tertiary period was previously one of the major divisions of the geologic timescale, from the end of the Cretaceous period about 65. ... Paleogene (alternatively Palaeogene) period is a unit of geologic time that began 65 and ended 23 million years ago. ... The Paleocene epoch (65-56 MYA) (early dawn of the recent) is the first geologic epoch of the Palaeogene period in the modern Cenozoic era. ... The Eocene epoch (56-34 MYA) is a major division of the geologic timescale and the second epoch of the Palaeogene period in the Cenozoic era. ... The Oligocene epoch is a geologic period of time that extends from about 34 million to 23 million years before the present. ... The Danian (also known as the Montian) is the first stage of the Paleocene Epoch. ... The Lutetian is a stage of the middle Eocene Epoch. ... The Rupelian (also known as Stampian, Tongrian, Latdorfian, or Vicksburgian) is the first of two stages of the Oligocene Epoch. ... The Chattian (also known as Chickasawhayan) is the second and final of two stages of the Oligocene Epoch. ... In the geologic timescale, the Bartonian is the age of the Eocene epoch of the Paleogene period of the Cenozoic era of the Fanerozoic eon that is comprehended between 40 million 400 thousand and 37 million 200 thousand years ago, approximatedly. ... The Priabonian (also known as Jacksonian or Runangan) is the final stage of the Eocene Epoch. ...