The Paleogene Period (IPA: / ˈ p eɪ l i. ə dʒ iː n,-l i. oʊ-, ˈ p æ l i-/ PAY-lee-ə-jeen, -⁠lee-oh-, PAL-ee-; also spelled Palaeogene or Palæogene) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period 66 Ma (million years ago) to the beginning of the Neogene Period 23.04 Ma.

Feb 21, 2025 · The term Paleogene was devised in Europe to emphasize the similarity of marine fossils found in rocks of the first three Cenozoic epochs, as opposed to the later fossils of the Neogene Period (23 million to 2.6 million years ago) and the Quaternary Period (2.6 million years ago to the present).

Oct 10, 2022 · The Paleogene period is when modern mammals started to develop. The extinction of the large reptiles gave other animals the chance to evolve. The latter part of the period was dominated by mammals. Most of the mammalian groups were already thriving by …

Apr 27, 2023 · The Paleogene Period is the first of three periods in the Cenozoic Era. The Paleogene represents less than 1% of geologic time; however, the rocks of this period were deposited quite recently and are, therefore, at or near Earth’s surface.

Learn about the time period that took place 65 to 23 million years ago. At the dawn of the Paleogene—the beginning of the Cenozoic era—dinosaurs, pterosaurs, and giant marine reptiles were...

Oct 30, 2012 · The Paleogene sees the rapid filling of the environment following the K/T extinction, though it took more than two million years for the Earth’s ecosystems to recover from this event. On land primitive mammals and birds began to spread rapidly.

The Paleogene Period The Beginning of The Cenozoic Era. The Paleogene Period marks the beginning of the Cenozoic Era. It began 65 million years ago and lasted more than 40 million years. The Paleogene is made up of three epochs: The Paleocene Epoch; The Eocene Epoch; The Oligocene Epoch

Jan 31, 2019 · The Paleogene was the first period of the Cenozoic Era (65 million years ago to the present), followed by the Neogene period (23-2.6 million years ago), and is itself divided into three important epochs: the Paleocene (65-56 million years ago), the Eocene (56-34 million years ago) and the Oligocene (34-23 million years ago).

The Paleogene period is most notable as being the time in which mammals evolved from small, simple forms into diverse animals in the wake of the mass extinction that ended the preceding Cretaceous period.

The Paleogene Period refers to the geological time interval from 66 to 23 million years ago, characterized by significant climate changes, the breakup of Pangea, and the diversification of various life forms, including mammals and marine organisms.