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Template: Cretaceous graphical timeline. ... Subdivision of the Cretaceous according to the ICS, as of 2023. [1] Vertical axis scale: Millions of years ago. References
The Cretaceous as a separate period was first defined by Belgian geologist Jean d'Omalius d'Halloy in 1822 as the Terrain Crétacé, [3] using strata in the Paris Basin [4] and named for the extensive beds of chalk (calcium carbonate deposited by the shells of marine invertebrates, principally coccoliths), found in the upper Cretaceous of ...
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 ...
The K–Pg boundary marks the end of the Cretaceous Period, the last period of the Mesozoic Era, and marks the beginning of the Paleogene Period, the first period of the Cenozoic Era. Its age is usually estimated at 66 million years, [2] with radiometric dating yielding a more precise age of 66.043 ± 0.043 Ma. [3]
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 ...
A map showing the location of the large igneous provinces of the world. The Deccan Traps are represented by the purple region in India. 1972. Peter Vogt reported evidence of intense volcanic activity occurring in India around the end of the Cretaceous. He hypothesized that this volcanic activity released poisonous trace elements which brought ...
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.
The Maastrichtian (/ m ɑː ˈ s t r ɪ k t i ə n / mahss-TRIK-tee-ən) is, in the International Commission on Stratigraphy (ICS) geologic timescale, the latest age (uppermost stage) of the Late Cretaceous Epoch or Upper Cretaceous Series, the Cretaceous Period or System, and of the Mesozoic Era or Erathem. It spanned the interval from .