Homehttps://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/Sciencehttps://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/Megalodon of extinction: Large white may have destroyed the largest shark ever lived
Megalodon of extinction: Large white may have destroyed the largest shark ever lived
A team of scientists argues that the giant prehistoric predator, as seen from countless documentaries and films such as Meg, starring Jason Steam, died 3.6 million years ago, not 2.6 million years ago.
studies relied on global samples of fossil materials, and one study involved their extinction with a supernova, which was thought to have caused cosmic radiation, which led to an increase in the number of cancers among large animals  South Carolina, re-evaluated existing records and found a different picture.
"We used the same global data set as the researchers used to do, but carefully scrutinized each case and found that most of the dates had several problems ̵
1; the age of the date was too young or inaccurate, which was erroneously identified, or old dates that have since been improved by the improvement of geology, – said Bossenecker in a statement. 19659005] The recently discovered titanium fossil found in the form of a heart tail "data-src-mini =" // cdn.cnn.com /cnnnext/dam/assets/190212152307-06-ancient-finds-mnyamawamtuka-recon-witton-small-169.jpg "data-src-xsmall =" // cdn.cnn.com/cnnnext/dam/assets/190212152307- 06-ancient- finds-mnyamawamtuka-recon-witton-medium-plus-169.jpg data-src-small = "http://cdn.cnn.com/cnnnext/dam/assets/190212152307-06-ancient-finds-mnyamawamtuka-recon -witton-large-169.jpg "data-src-medium =" // cdn.cnn.com/cnnnext/dam/assets/190212152307-06-ancient-finds-mnyamawamtuka-recon-witton-exlarge-169.jpg " data-src-large = "// cdn.cnn.com/cnnnext/dam/assets/190212152307-06-ancient-finds-mnyamawamtuka-recon-witton-super-169.jpg" data-src-full16x9 = "// cdn.cnn.com/cnnnext/dam/assets/190212152307-06-ancient-finds-mnyamawamtuka-recon-witton-full-169.jpg data-src-mini1x1 = "// cdn.cnn.com/cnnnext/dam /assets/190212152307-06-ancient-finds-mnyamawamtuka-recon-witton-small-11.jpg data-demand-load = "not-loaded" data-eq-pts = "mini: 0, xsmall: 221, small : 308, medium: 461, large: 781 src = "data: image / gif; base64, R0lGODlhEAAJAJEAAAAAAP /////// wAAACH5BAEAAAIALAAAAAAQAAkAAAIKlI + py + 0Po5yUFQA7" />
To estimate the date of extinction, the team took advantage of the thick rock record of California and Bai California, Mexico. found that actual digging cases were present at 3.6 million years ago.
This means that the extinction of megalodone is not immediately attributable to the massive death of seals, walrus, sea cows, sea pigs, dolphins and whales from about 1 to 2.5 million years, "said Bossenecker. Thus, this extinction can not be a mass extinction caused by an event, such as supernova, as suggested by previous studies.
Instead, the newly developed large white shark, Carcharodon carcharias probably played a role in extinction megalodone, after large white teeth have spread from their original home in the Pacific Ocean about 6 million years ago to the seas around the world 4 million years ago.
"We propose that this short overlap (3.6-4 million years ago) was enough time for big white sharks to spread throughout the world, and from there competed megalodone throughout its range. not a radiation from space, – said Bossenecker in a statement.
Big white sharks are known as terrible apical predators today, but megalodones can reach three times Ze of the largest white, ever recorded.
It may seem weird that a smaller acu but could argue with much more fish, but other experts support this statement.
Emma Bernard, curator of fossil fish, the Museum of Natural History in London, said that research is a big step forward in improving our understanding of the extinction of one of the largest sharks,
"The reason for this extinction is still hotly debated, but the broad consensus is that competition with other large predators on top, such as the killer whales and large white sharks, can be an important factor," said Bee CNN e-mail rnar. "This study uses the highest quality data to challenge the old favorite favorite hypothesis, which highlights the key role that museum collections play and the importance of accurate and detailed record-keeping during compilation of assumptions."