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The Neogene (/ ˈ n iː. ə dʒ iː n / NEE-ə-jeen, [6] [7]) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period 23.04 million years ago to the beginning of the present Quaternary Period 2.58 million years ago.
1150–1350: Pueblo III Period in the American Southwest. [18] The most important city of the Mississippian culture of mound builders, Cahokia on the Mississippi River opposite modern Saint Louis, Missouri, reached its zenith. It was the largest city in North America in the 12th century. [19]
A less severe cold period or ice age is shown during the Jurassic-Cretaceous (150 Ma). There have been five or six major ice ages in the history of Earth over the past 3 billion years. The Late Cenozoic Ice Age began 34 million years ago, its latest phase being the Quaternary glaciation , in progress since 2.58 million years ago.
During the Cretaceous, the Gulf of Mexico expanded until it split North America in half. Plesiosaurs and mosasaurs swam in its waters. Later into the period, it began to withdraw and the coastal plains of the western states were home to dinosaurs like Edmontosaurus, Triceratops, and Tyrannosaurus. Another mass extinction ended the reign of the ...
Geologic formations of the Neogene Period, in Cenozoic Era United States, North America. See also the preceding Category:Paleogene United States and the succeeding Category:Quaternary United States Subcategories
Neogene North America: geologic formations of the Neogene Period in Cenozoic Era North America ... Neogene life of North America (2 C, 1 P) M. Neogene Mexico (1 C, 53 P)
East Greenland Orogen – From Cryogenian to Devonian Periods; Taconic phase – Mountain-building period that affected most of New England – In the northeastern U.S. and Canada, during the Ordovician Period; Acadian phase – North American orogeny – In the eastern U.S., during the Silurian and Devonian Periods
The Neogene Period is a unit of geologic time starting 23.03 Ma. [10] and ends at 2.588 Ma. The Neogene Period follows the Paleogene Period. The Neogene consists of the Miocene and Pliocene and is followed by the Quaternary Period.