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  1. Wikipedia
    https://en.wikipedia.org/wiki/Cretaceous–Paleogene_extinction_event

    Cretaceous–Paleogene extinction event - Wikipedia

    • The Cretaceous–Paleogene (K–Pg) extinction event, also known as the K–T extinction, was the mass extinction of three-quarters of the plant and animal species on Earth approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs. Most other tetrapods weighing more than 25 kg (55 lb) also became extinct, with the excep… See more

    Extinction patterns

    The K–Pg extinction event was severe, global, rapid, and selective, eliminating a vast number of species. Based on … See more

    Dating

    A 1991 study of fossil leaves dated the extinction-associated freezing to early June. A later study shifted the dating to spring season, based on the osteological evidence and stable isotope records of well-preserved … See more

    Duration

    The extinction's rapidity is a controversial issue because some researchers think the extinction was the result of a sudden event, while others argue that it took place over a long period. The exact length of time is difficult to d… See more

    Causes

    In 1980, a team of researchers consisting of Nobel Prize-winning physicist Luis Alvarez, his son, geologist Walter Alvarez, and chemists Frank Asaro and Helen Michel discovered that sedimentary layers found all over the wo… See more

    See also

    • Climate across Cretaceous–Paleogene boundary
    • Late Devonian extinction – One of the five most severe extinction events in the history of the Earth's biota
    • List of possible impact structures on Earth… See more

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    Table of Contents
    Extinction patterns
    Dating
    Duration
    Causes
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  1. Cretaceous-Tertiary
    Geologists talk of the delineation between the Cretaceous and Tertiary periods, K-T extinction event. Sixty-five million years ago an asteroid ripped a gigantic crater in the Earth's crust, in the area of the Gulf of Mexico. The impact changed life on Earth forever, an entire era came to an end.

    Earth's history: What happens after a met…

    www.britannica.com/video/Jan-Smit-extinction-sam…
    The Cretaceous‑Tertiary extinction event, or the K‑T event, is the name given to the die‑off of the dinosaurs that took place some 65.5 million years ago. The discovery of iridium‑enriched clay at the K‑T boundary bolstered the theory that an asteroid or meteor impact event may have caused the mass extinction.

    Why Did the Dinosaurs Die Out? ‑ Cause…

    www.history.com/topics/pre-history/why-did-the-din…
    Researchers now think that the asteroid strike that created the K-T boundary was probably the Chicxulub Crater. This is a massive impact crater buried under Chicxulub on the coast of Yucatan, Mexico. The crater measures 180 kilometers across, and occurred about 65 million years ago.

    K-T Boundary - Universe Today

    www.universetoday.com/39801/k-t-boundary/
  2. People also ask
    Was the KT Extinction a mystery?
    This was true not only in Hell Creek but all over the world. For many years, scientists believed that the KT extinction was no great mystery: over millions of years, volcanism, climate change, and other events gradually killed off many forms of life.

    The Day the Dinosaurs Died - The New Yorker

    newyorker.com
    Did the Chicxulub asteroid kill the dinosaurs?
    Robert A. de Palm has found strong evidence that the dinosaurs —and nearly all other life on Earth —were indeed wiped out 66 million years ago by the Chicxulub asteroid Wikimedia Commons has media related to K/T Event. What killed the dinosaurs? —University of California Museum of Paleontology (1995)

    Cretaceous–Paleogene extinction event - Wikipedia

    en.wikipedia.org
    Was the KT impactor a comet?
    Although Dr. Bottke remains unconvinced that the impactor had a cometary origin, he noted that the asteroid explanation also raised many exciting and unresolved questions. “The evidence we have for the KT impactor is more suggestive of asteroids than comets, but it’s not conclusive,” Dr. Bottke said.

    Where Did the Dinosaur-Killing Impactor Come From?

    nytimes.com
    Was the Chicxulub asteroid a cause of the extinction?
    In March 2010, an international panel of scientists endorsed the asteroid hypothesis, specifically the Chicxulub impact, as being the cause of the extinction. A team of 41 scientists reviewed 20 years of scientific literature and in so doing also ruled out other theories such as massive volcanism.

    Alvarez hypothesis - Wikipedia

    en.wikipedia.org
    What happened to asteroid ejecta?
    Some of the ejecta escaped Earth’s gravitational pull and went into irregular orbits around the sun. Over millions of years, bits of it found their way to other planets and moons in the solar system. Mars was eventually strewn with the debris—just as pieces of Mars, knocked aloft by ancient asteroid impacts, have been found on Earth.

    The Day the Dinosaurs Died - The New Yorker

    newyorker.com
    What is the KT boundary?
    Today, the layer of debris, ash, and soot deposited by the asteroid strike is preserved in the Earth’s sediment as a stripe of black about the thickness of a notebook. This is called the KT boundary, because it marks the dividing line between the Cretaceous period and the Tertiary period.

    The Day the Dinosaurs Died - The New Yorker

    newyorker.com
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  3. Wikipedia
    https://en.wikipedia.org/wiki/Chicxulub_crater

    Chicxulub crater - Wikipedia

  4. Britannica
    https://www.britannica.com/science/K-T-extinction

    K–T extinction | Overview & Facts | Britannica

  5. Wikipedia
    https://en.wikipedia.org/wiki/Alvarez_h…

    Alvarez hypothesis - Wikipedia

    The Alvarez hypothesis posits that the mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth.

  6. The New Yorker
    https://www.newyorker.com/magazine/20…

    The Day the Dinosaurs Died - The New Yorker

    Mar 29, 2019 · Within two minutes of slamming into Earth, the asteroid, which was at least six miles wide, had gouged a crater about eighteen miles deep and lofted twenty-five trillion metric tons of debris...

  8. NASA Solar System Exploration
    https://solarsystem.nasa.gov/sl9/back3.html

    K-T Event - NASA Solar System Exploration

  9. Smithsonian Magazine
    https://www.smithsonianmag.com/science-nature/...

    What Happened the Day a Giant, Dinosaur-Killing Asteroid Hit the …

  10. New York Times
    https://www.nytimes.com/2021/02/15/scie…

    Where Did the Dinosaur-Killing Impactor Come From?

    Feb 15, 2021 · A new study blames a comet fragment for the death of the dinosaurs 66 million years ago. But most experts maintain that an asteroid caused this cataclysmic event.

  11. History
    https://www.history.com/topics/pre-history/why-did...

    Why Did the Dinosaurs Die Out? ‑ Causes & Dates - HISTORY

  12. Universe Today
    https://www.universetoday.com/39801

    K-T Boundary - Universe Today

    Sep 10, 2009 · What is the K-T boundary? K is actually the traditional abbreviation for the Cretaceous period, and T is the abbreviation for the Tertiary period. So the K-T boundary is the point in between the...