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The Cretaceous (IPA: / k r ɪ ˈ t eɪ ʃ ə s / krih-TAY-shəss) [2] is a geological period that lasted from about 143.1 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest.
Cretaceous graphical timeline −140 — – ... Subdivision of the Cretaceous according to the ICS, as of 2023. [1] Vertical axis scale: Millions of years ago.
The Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after creta, the Latin word for the white limestone known as chalk.
It marked the end of the Cretaceous period, and with it the Mesozoic era, while heralding the beginning of the current era, the Cenozoic. In the geologic record, the K–Pg event is marked by a thin layer of sediment called the K–Pg boundary or K–T boundary, which can be found throughout the world in marine and terrestrial rocks.
The Jurassic North Atlantic Ocean was relatively narrow, while the South Atlantic did not open until the following Cretaceous Period, when Gondwana itself rifted apart. [46] The Tethys Sea closed, and the Neotethys basin appeared. Climates were warm, with no evidence of glaciation. As in the Triassic, there was apparently no land near either ...
Summer: A poll of more than 600 paleontologists and other Earth scientists found 24% to support the impact hypothesis of the Cretaceous–Paleogene extinction event, 38% agreed that the impact occurred but was not the true cause of the mass extinction, 26% denied that any impact had occurred and 12% completely denied the occurrence of a mass ...
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 archosaurian reptiles such as the dinosaurs, and of gymnosperms such as cycads, ginkgoaceae and araucarian conifers; 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