Posted on 02/10/2013 5:50:15 PM PST by SunkenCiv
"The previous data that we had ... actually said that they (the tektites and the ash) were different in age, that they differed by about 180,000 years and that the extinction happened before the impact, which would totally preclude there being a causal relationship," said Renne, who studies ties between mass extinctions and volcanism.
He and colleagues were comparing a new technique to date geologic events when they realized there was a discrepancy in the timing -- the so-called 'K-T boundary' -- the geological span of time between the Cretaceous and Paleocene periods when the dinosaurs and most other life on Earth died out.
"I realized there was a lot of room for improvement. Even though many people had locked in their opinions that the impact and the extinctions were synchronous or not, they were basically ignoring the existing data," Renne said.
The study, published in Science, resolves existing uncertainty about the relative timing of the events, notes Heiko Plike of the Center for Marine Environmental Sciences at the University of Bremen, Germany.
Renne, for one... says ecosystems already were in a state of deterioration due to a major volcanic eruption in India when the asteroid struck... adding that the theory was speculative...
About 1 million years before the impact, Earth experienced six abrupt shifts in temperature of more than 2 degrees in continental mean annual temperatures, according to research cited by Renne and his co-authors.
The temperature swings include one shift of 6 to 8 degrees that happened about 100,000 years before the extinction.
(Excerpt) Read more at news.yahoo.com ...
I can tell you have a PhD.
Explosive diarrhea caused by global warming? Simultaneously fascinating and disgusting!
I don't know why everyone is so interested in what killed the ....dinosaurs.
It's pretty obvious.
... I mean... oil comes from dinosaurs and ......
Seriously though, large scaly creatures ruled over the Earth for much, much longer than it is likely WE will. So far, they were a 1000 times more successful than we currently are. It's more of a mystery why they survived so long before extinction, considering that 99% of all species that have lived on this planet have gone extinct.
Mix Roundup Pro/Ranger Pro to 4oz/gal (grasses) with a Mechamine product (all other weeds) at 8oz/gal plus some form of spreader sticker and they will die.
Most off the shelf stuff is too weak and does not include a sticker to prevent the mixture from running off the leaves. The stickler will cause the mixture to dry in place within 15 minutes.
Best ever weed killer was Choridaine - 1/2 oz/gal killed everything for some years. Now banned as to deadly and too effective.
Thanks for the advice.
An Indian scientist, Chaterjee (sp?) has also postulated a huge crater off Mumbai, much larger than the one for Yucatan and possible cause of the Deccan Trappes.
It’s interesting that, well, let’s see, where’s that old topic...
NASA digital images discover ancient “Ramayana” bridge between India, Lanka
PTI | Washington, October 09 2002 | Editorial Staff
Posted on 10/09/2002 8:35:38 AM PDT by vannrox
http://www.freerepublic.com/focus/news/765870/posts
Okay, it turns out there were a bunch of topics, but anyway, Bay of Bengal could be a crater, this bridge part of the rim. :’)
Well, they seem to be inching ever more closely to admitting Alvarez was right.
Opponents will slowly but surely die off.
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.