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Cretaceous. Paleogene. ↓ Quaternary. Neogene. Subdivision of the Phanerozoic according to the ICS, as of 2023. [1] Vertical axis scale: Millions of years ago.
Cretaceous. P a l e o g e n e. Neogene. P a l e o c e n e. E o c e n e. O l i g o c e n e. Danian. Selandian. Thanetian. Ypresian. Lutetian. ... Subdivision of the ...
End Cretaceous: 66 million years ago, 76% of species lost, including all ammonites, mosasaurs, plesiosaurs, pterosaurs, and nonavian dinosaurs; Smaller extinction events have occurred in the periods between, with some dividing geologic time periods and epochs. The Holocene extinction event is currently under way. [12]
A study aiming to quantify the habitat of latest Cretaceous North American dinosaurs, based on data from fossil occurrences and climatic and environmental modelling, and evaluating its implications for inferring whether dinosaur diversity was in decline prior to the Cretaceous–Paleogene extinction event, was published by Chiarenza et al ...
The Cretaceous–Paleogene (K–Pg) extinction event, [a] also known as the K–T extinction, [b] was the mass extinction of three-quarters of the plant and animal species on Earth [2] [3] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs.
For example, the Cretaceous–Paleogene extinction event, marks the lower boundary of the Paleogene System/Period and thus the boundary between the Cretaceous and Paleogene systems/periods. For divisions prior to the Cryogenian , arbitrary numeric boundary definitions ( Global Standard Stratigraphic Ages , GSSAs) are used to divide geologic time.
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c. 143.1 Ma – End of Jurassic and beginning of Cretaceous Period. c. 145 Ma – First mantises. c. 140 Ma – Earliest orb-weaver spiders evolve. c. 130 Ma – Laurasia and Gondwana begin to split apart as the Atlantic Ocean forms. First flowering plants. Earliest anglerfish.