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Alternatively, interpretation based on the fossil-bearing rocks along the Red Deer River in Alberta, Canada, supports the gradual extinction of non-avian dinosaurs; during the last 10 million years of the Cretaceous layers there, the number of dinosaur species seems to have decreased from about 45 to approximately 12. Other scientists have made ...
A rebuttal in Astronomy & Geophysics countered that Loeb et al. had ignored that the amount of iridium deposited around the globe, 2.0 × 10 8 –2.8 × 10 8 kg (4.4 × 10 8 –6.2 × 10 8 lb), was too large for a comet of the size implied by the crater, and that they had overestimated likely comet impact rates.
The study confirmed previous findings that identified the asteroid as a carbonaceous-type, or C-type, asteroid, but refuted a 2021 hypothesis that the dinosaur killer was likely a comet.
Walter Alvarez at the original site where he discovered the dinosaur extinction evidence near Gubbio, Italy. Alvarez and his father Luis W. Alvarez, together with Frank Asaro and Helen Michel, discovered that a clay layer occurring right at the Cretaceous–Paleogene (K-Pg) boundary was highly enriched in the element iridium.
A six-mile-long asteroid, which struck Earth 66 million years ago, wiped out the dinosaurs and more than half of all life on Earth.The impact left a 124-mile-wide crater underneath the Gulf of ...
While the dinosaurs met their end around 66 million years ago in a catastrophic way, their extinction may have been crucial to the development of the human race.
A review in Systematic Biology complains that the book "at times seems a review of his and his colleagues' accomplishments" but nevertheless calls it overall "captivating". [10] Several reviewers criticized Brusatte's focus on T. rex and other "celebrity" [10] clades, with one reviewer complaining that they "got somewhat out-T. rexed". [4] [12]
Around 66 million years ago, an asteroid larger than Mt. Everest ripped through the atmosphere of Earth, striking our planet at the Yucatán Peninsula, on the southeastern coast of Mexico.