Oxytropidoceras Posted October 26, 2016 Share Posted October 26, 2016 End-Permian mass extinction was not so massive By Belinda Smith, Cosmos Magazine https://cosmosmagazine.com/palaeontology/mass-extinctions-were-not-so-massive-study "US paleontologists states once the dust settled following the 'great dying' around 250 million years ago, nearly 20% of species remained – not 4%. Belinda Smith reports." Paleontologist suggests 'great dying' 252 million years ago wasn't as bad as thought, October 4, 2016 http://phys.org/news/2016-10-paleontologist-great-dying-million-years.html The paper is: Stanley, S. M., 2016, Estimates of the magnitudes of major marine mass extinctions in earth history. Proceedings of the National Academy of Sciences, US, vol. 113 no. 42 E6325-E6334 http://www.pnas.org/content/113/42/E6325 Yours, Paul H. Link to comment Share on other sites More sharing options...
tmaier Posted October 26, 2016 Share Posted October 26, 2016 This change from ~95% mortality to ~80% mortality is found by theoretical calculation, and not by empirical evidence, so it a change in accounting methods, rather than direct evidence. From the first article: "Taking Signor-Lipps into account, Stanley calculated the extinction at the end of the Permian, around 250 million years ago, killed off 81% of marine species – fewer than the oft-quoted 96%" They used a correction factor for Signor-Lipps probability. It all depends on how you want to calculate this. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now