Outcrop photos of the Permian-Triassic boundary interval at Penglaitan. Credit: NIGPAS
Posted on 09/24/2018 7:33:15 PM PDT by SunkenCiv
It took less than 30,000 years and maybe only thousands, to kill more than 90% of sea creatures and most land species, according to the most precise study ever published about the mass extinction marking the end of the Permian Period.
Earth's greatest mass extinction, also known as the "Great Dying," occurred about 252 million years ago. By some estimates, over 90% of sea creatures and most land-dwelling reptiles disappeared. Even usually resilient plants and insects suffered near annihilation...
Scientists from China, the USA and Canada combined new high-resolution radiometric dating of seven closely spaced layers of volcanic material from South China's Penglaitan section with detailed biostratigraphy and geochemical analyses. Results show the duration of the end-Permian mass extinction to be about 31 thousand years, essentially instantaneous by geological standards...
SHEN and his colleagues documented a rich Late Permian biota at Penglaitan, with at least 10 major marine fossil groups, including brachiopods, ammonoids, sponges, corals, conodonts, foraminifera, bryozoans, bivalves, and trilobites. Twenty-nine of the 66 Permian species identified in the section disappeared within or at the top of a single bed of volcanic ash-rich sandstone (Bed 141). Moreover, there is no "survival interval" of Permian taxa extending into the Early Triassic. This highly diverse marine ecosystem suddenly disappeared during the time of deposition of Bed 141...
High-resolution paleotemperature measurements across the mass extinction interval suggest a substantial warming of up to 10 degrees Celsius immediately after the mass extinction event.
(Excerpt) Read more at eurekalert.org ...
Outcrop photos of the Permian-Triassic boundary interval at Penglaitan. Credit: NIGPAS
They worked in volcanic eruptions and global warming as the cause (preposterous), those interested should read the original.
|
“about 252 million years ago.” Exactly? So they really don’t know and it is pure speculation.
You misunderstand what the meaning of the phrase ‘pure speculation’ is. This is the exact opposite.
HaHaHaHaHa... English for the new world?
One degree celsius equals 1.8 degrees Fahrenheit. So 20 degrees celsius equals 36 degrees Fahrenheit. Add that to any temperature and you have serious ecological problems.
You can see the layer of plastic straws which caused the Great Dying.
LMAO!
No, you're just a moron.
What ever caused the Siberian Traps to be formed occurred around the same period as the Permian extinction.
Particularly if the temperature change is from a large impact, a la Chicxulub. The entire atmosphere went up suddenly, as in 90 minutes or so throughtout the world's surface.
Radiometric dating on the Traps has tightened down to about 7 million years, but if anything, the P-T extinction and the traps had a common causative event -- obviously an impact. It's not unlikely that the most likely candidate for the impact site *is* the Siberian Traps, which slowly covered over the astrobleme.
Never address the topic, or exhibit any interest in science or history, just regurgitate your same old tired BS.
“...a single bed of volcanic ash-rich sandstone...”
Could be a clue in there.
Yes, because God put the fossils in the flat eart 6,000 years ago. Just to throw us off.
One of the arguments I've heard for the P-T extinction not being caused by an impact is the lack of an iridium layer, similar to the one found for the Cretaceous extinction. I've also heard that the Permian extinctions appear to have occurred over a long period of time, rather than being a swift die-off.
Dating something to 3 significant digits is "speculation"?
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.
