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  2. Cretaceous–Paleogene extinction event - Wikipedia

    en.wikipedia.org/wiki/Cretaceous–Paleogene...

    Scientists agree that all non-avian dinosaurs became extinct at the K–Pg boundary. The dinosaur fossil record has been interpreted to show both a decline in diversity and no decline in diversity during the last few million years of the Cretaceous, and it may be that the quality of the dinosaur fossil record is simply not good enough to permit ...

  3. Timeline of Cretaceous–Paleogene extinction event research

    en.wikipedia.org/wiki/Timeline_of_Cretaceous...

    Raymond B. Cowles proposed that the dinosaurs went extinct when Earth's climate became so hot and dry that it affected the ability of male dinosaurs to produce sperm cells. [23] 1946. Edwin Harris Colbert and others proposed that the dinosaurs went extinct when Earth's climate became too hot and dry to support them. [23] 1949

  4. List of North American dinosaurs - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    VOA report about North American dinosaurs. The Late Jurassic of North America, however, is the exact opposite of the Middle Jurassic. The Late Jurassic Morrison Formation is found in several U.S. states, including Colorado, Utah, Wyoming, Montana, New Mexico, Oklahoma, South Dakota, and Texas. It is notable as being the most fertile single ...

  5. Alvarez hypothesis - Wikipedia

    en.wikipedia.org/wiki/Alvarez_hypothesis

    He further posits that the mass extinction of dinosaurs occurred within 33,000 years of this date. [ 8 ] In April 2019, a paper was published in PNAS which describes evidence from a fossil site in North Dakota that the authors say provides a "postimpact snapshot" of events after the asteroid collision "including ejecta accretion and faunal mass ...

  6. Dinosaur - Wikipedia

    en.wikipedia.org/wiki/Dinosaur

    A 2016 estimate put the number of dinosaur species living in the Mesozoic at 1,543–2,468, [24] [25] compared to the number of modern-day birds (avian dinosaurs) at 10,806 species. [26] Extinct dinosaurs, as well as modern birds, include genera that are herbivorous and others carnivorous, including seed-eaters, fish-eaters, insectivores, and ...

  7. Scientists believe they have finally uncovered what killed ...

    www.aol.com/news/scientists-believe-finally...

    The amount of dust strangling the atmosphere is thought to have been about 2,000 gigatonnes; more than 11 times the weight of Mount Everest. Researchers ran simulations on sediment found at a ...

  8. Geological history of North America - Wikipedia

    en.wikipedia.org/wiki/Geological_history_of...

    Planktonic foraminiferans barely survived. Two thirds of coral species became extinct. About half of sponge families became extinct. Bivalves, bryozoans, and gastropods also sustained heavy losses. The major Mesozoic marine reptile groups became extinct. On land, the non-avian dinosaurs and pterosaurs became extinct. [86]

  9. Cretaceous - Wikipedia

    en.wikipedia.org/wiki/Cretaceous

    Species that depended on photosynthesis declined or became extinct as atmospheric particles blocked solar energy. As is the case today, photosynthesizing organisms, such as phytoplankton and land plants, formed the primary part of the food chain in the late Cretaceous, and all else that depended on them suffered, as well.