Scientists at The Berkley Geochronology Center have announced recently that the last dinosaurs became extinct at what is called the Cretaceous-Tertiary boundary period, which occurred 65.95 million years ago (give or take 40,000 years). They modified this from the previously-thought date, which was 65.5 million years ago, using a technique known as argon argon dating. This process, which is used to determine the age of rocks, has been improved over the years, which led to the date modification; previously, argon argon dating had a 2.5% margin of error, whereas currently, the margin of error is .25%.
Of course, many plant species, as well as some animals (including the crocodile), are believed to have lived at the same time as the dinosaurs.
The last dinosuar is believed to have died off 65 million years ago, give or take a day. Scientist to this very day are still not in agreement to the exact cause, whether it was a meteor or volcanic activity.
In response to the answer above, scientists have now “officially” agreed that a meteorite that fell to the earth 65 million years ago was the cause of the dinosaurs’ extinction. The meteorite instanly killed many species upon impact. Particles from the crash were launched high into the air, blocking the sun’s rays and creating a long, massive winter. The sudden winter killed even more species (scientists say about more than 70% of known species were eradicated).
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