Oof. Good question with many answers. Some believe the mammoths went extinct 9,000 years ago, during the Pleistocene Epoch, the last ice age (http://www.enchantedlearning.com/subjects/mammals/mammoth/). This is in keeping with the theory of a “quick freeze” – the mammoths very quickly succumbed to a surprisingly fast ice age. Then, there is the theory that they were doing well in the ice age climate and it was only when the climate turned more continental, with warmer summers and colder winters, that they died out.
The Lawrence Berkeley National Laboratory suggests that it was a supernova that exploded 41,000 years ago with the result that, 13,000 years ago, a comet hit the earth and killed the mammoths. (http://www.spaceref.com/news/viewpr.html?pid=17893)
One thing that perplexes scientists is that some mammoth fossils have been found standing up. They don’t know what this means for how they died. Many of them are very intact, from their tusks to their stomach contents, which means that they were buried quickly but again, they do not know how this would have happened.
So your range is probably safe at 9,000 to 13,000 years ago but the data is still not absolute.
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