Social Media Sidebar

Announcement

Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

We are all now connected by the Internet, like neurons in a giant brain.

 

Stephen Hawking

 

Dinosaur die out the second of two closely timed extinctions

RATE THIS! +1
Posted in Science on 7th Sep, 2012 06:57 PM by AlexMuller

The well-known second event is believed to have been triggered by an asteroid at least 6 miles in diameter slamming into Mexico’s Yucatán Peninsula. But new evidence shows that by the time of the asteroid impact, life on the seafloor – mostly species of clams and snails – was already perishing because of the effects of huge volcanic eruptions on the Deccan Plateau in what is now India.

 

“The eruptions started 300,000 to 200,000 years before the impact, and they may have lasted 100,000 years,” said Thomas Tobin, a UW doctoral student in Earth and space sciences.

 

The eruptions would have filled the atmosphere with fine particles, called aerosols, that initially cooled the planet but, more importantly, they also would have spewed carbon dioxide and other greenhouse gases to produce long-term warming that led to the first of the two mass extinctions.

 

“The aerosols are active on a year to 10-year time scale, while the carbon dioxide has effects on a scale of hundreds to tens of thousands of years,” Tobin said.

 

During the earlier extinction it was primarily life on the ocean floor that died, in contrast to the later extinction triggered by the asteroid impact, which appeared to kill many more free-swimming species.

 

“The species in the first event are extinct but the groups are all recognizable things you could find around on a beach today,” he said.

 

Tobin is the lead author of a paper in the journal Palaeogeography, Palaeoclimatology, Palaeoecology that documents results of research conducted in a fossil-rich area on Seymour Island, off the Antarctic Peninsula.

 

That particular area has very thick sediment deposits and, for a given interval of time, might contain 10 times more sediment as the well-known Hell Creek Formation in Montana. That means scientists have much greater detail as they try to determine what was happening at the time, Tobin said.


 



Read original article » Back to category

Comments

Author: Guest
Posted: 2013-10-25
+0
pvmSwJ A round of applause for your blog post.Much thanks again. Reply
Author: Guest
Posted: 2013-10-25
+0
RtcaWr Great blog article.Thanks Again. Will read on... Reply
Author: Guest
Posted: 2013-11-22
+0
Dec18 Thanks for the ideas you are giving on this wlboeg. Another thing I'd like to say is that getting hold of some copies of your credit file in order to look at accuracy of the detail could be the first activity you have to perform in credit score improvement. You are looking to freshen your credit file from harmful details errors that mess up your credit score. Reply


 

Recent headlines

  • Posted in Science on 2017-06-26 14:35:26
    France to ban all new oil and gas exploration in.....read more
    Posted in Hardware on 2017-06-26 14:23:06
    Varjo Promises Human-Eye Resolutions For VR This Year..read more
    Posted in Science on 2017-06-26 14:17:14
    SpaceX Pulls Off Two Droneship Landings in Three Days..read more
    Posted in Business on 2017-06-25 14:44:38
    Microsoft wants to make Direct Reality VR’s answer to.....read more
    Posted in Medicine on 2017-06-25 14:31:51
    UK's first heart pump targets 2018 clinical trial..read more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in about.....read more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for commercial.....read more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 Downloads..read more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into new.....read more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs,.....read more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for commercial.....read more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short Sighted..read more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, but.....read more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in about.....read more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target mitochondria..read more

Recent Blog Posts

  • Posted by AlexMuller
    Nanoparticle vaccine shows potential as immunotherapy to fight.....read more
    Posted by AlexMuller
    Obesity is top cause of preventable life-years lost, study shows..read more
    Posted by AlexMuller
    Light can be utilized to control gene function..read more
    Posted by AlexMuller
    Brain stimulation restores memory during lapses, research shows..read more
    Posted by AlexMuller
    Wax worm caterpillar will eat plastic shopping bags: New.....read more

Login to your Account

Login to your PlanetTech Account here

Username:
Password:
Remember me
or

Create a New Account

You just need username and password

The following errors occured:
Username:
Email:
Password:
Verify password:
Remember me