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The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now-extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was largely ice-free, although there is some evidence ...
Smith and others concluded that the Late Cretaceous drop in sea levels constituted the most severe marine regression of the entire Mesozoic Era. [102] D'Hondt and others argued that an asteroid impact at the end of the Cretaceous would not have produced enough acid for acid rain to be a significant factor contributing to the mass extinction. [56]
Region in Russia where rocks from this period were first identified Triassic: c. 251.902 Ma: Lt. trias: triad: In Germany this period forms three distinct layers Jurassic: c. 201.4 Ma: Jura Mountains: Mountain range in the Alps in which rocks from this period were first identified Cretaceous: c. 143.1 Ma: Lt. creta: chalk: More chalk formed in ...
The Cretaceous Period extends from circa to 10] During the Cretaceous, the late Paleozoic ... Evolution timeline Archived 2012-10-22 at the Wayback Machine ...
The Mesozoic Era [3] is the era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Periods.It is characterized by the dominance of gymnosperms such as cycads, ginkgoaceae and araucarian conifers, and of archosaurian reptiles such as the dinosaurs; a hot greenhouse climate; and the tectonic break-up of Pangaea.
Cretaceous–Paleogene boundary and Cretaceous–Paleogene extinction event, extinction of dinosaurs: 55.8: Paleocene–Eocene Thermal Maximum: 53.7: Eocene Thermal Maximum 2: 49: Azolla event may have ended a long warm period 5.3–2.6: Pliocene climate became cooler and drier, and seasonal, similar to modern climates. 2.5 to present
Cretaceous graphical timeline −140 — – ... Subdivision of the Cretaceous according to the ICS, as of 2023. [1] Vertical axis scale: Millions of years ago.
Despite the western upheaval, the eastern US had achieved geological stability by the Late Cretaceous. [72] The weather was uniformly warm and rainy throughout the year. [85] Flowering plants were now common and fossil of broadleaf trees and shrubs were preserved in Late Cretaceous rocks. [85] The Cretaceous ended with another mass extinction.