Navigation Links
Seismic images show dinosaur-killing meteor made bigger splash
Date:1/23/2008

some evidence that marine organisms more resistant to a range of pH survived while those more sensitive did not.

Gulick says the mass extinction event was probably not caused by just one mechanism, but rather a combination of environmental changes acting on different time scales, in different locations. For example, many large land animals might have been baked to death within hours or days of the impact as ejected material fell from the sky, heating the atmosphere and setting off firestorms. More gradual changes in climate and acidity might have had a larger impact in the oceans.

Gulick and collaborators originally set out to learn more about the trajectory of the asteroid. They had hoped the craters structure in the subsurface would hold a tell-tale signature. Instead, the structure seemed to be most strongly shaped by the pre-impact conditions of the target site.

We discovered that the shallow structure of the crater was determined much more by what the impact site was like before impact than by the trajectory of the impactor, says Gulick.

If scientists can determine the trajectory, it will tell them where to look for the biggest environmental consequences of impact, because most of the hazardous, shock-heated and fast-moving material would have been thrown out of the crater downrange from the impact.

Researchers at Imperial College in London are already using computer models to search for possible signatures in impact craters that could indicate trajectory regardless of the initial surface conditions at the impact site.

As someone who simulates impact events using computers, this work provides valuable new constraints on both the pre-impact target structure and the final geometry of the cratered crust at Chicxulub, says Gareth Collins, a research fellow at Imperial College.


'/>"/>

Contact: Marc Airhart
mairhart@jsg.utexas.edu
512-471-2241
University of Texas at Austin
Source:Eurekalert

Page: 1 2

Related biology news :

1. MIT creates 3-D images of living cell
2. Meteor no longer prime suspect in great extinction
3. Economists: Reduce fish catch now for bigger net profits later
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/20/2014)... -- Bay Area Lyme Foundation, which aims to make ... applauds new research published in an upcoming issue of ... Diseases . The findings show that ticks that ... the year, making the threat of Lyme disease year-round. ... of Public Health (CDPH) Vector-borne Disease Section and University ...
(Date:8/20/2014)... who have suffered concussions ready to return to action? ... high school athletes who head back on the field ... regression in their abilities to simultaneously walk and do ... changes in their balance and/or altered walking speed, was ... 12 had returned to activity in less than a ...
(Date:8/20/2014)... Virginia Tech,s Wu Feng has built upon a National ... in the Cloud" program, and synergistically complemented it with ... the Air Force on "big computing" for mini-drones and ... Institutes of Health on "big data" for the life ... aspects from each grant, he was able to tell ...
Breaking Biology News(10 mins):Lyme disease risk is year-round in Northwest California, according to new study 2Lyme disease risk is year-round in Northwest California, according to new study 3Recovery reversal seen in Oregon study of returning concussed athletes 2Recovery reversal seen in Oregon study of returning concussed athletes 3The internet was delivered to the masses; parallel computing is not far behind 2The internet was delivered to the masses; parallel computing is not far behind 3The internet was delivered to the masses; parallel computing is not far behind 4
... Virtually all babies in the U.S. have their heels ... for genetic testing. These "heel stick" tests identify rare ... more disorders are added to the screening ?many states ... on the rise. In the June issue of Pediatrics, ...
... of their parents may give birds a preference for ... more exactly match those of their parents. Such learned ... traits and strong morphological differences between sexes ?phenomena seen ... reported by Carel ten Cate, Machteld Verzijden and Eric ...
... sub-Saharan Africa, according to the World Health Organization, and ... achieved limited success. But what if a vaccine against ... of Africa ?chancroid ?was relatively easy to develop and ... , That may be the case, according to researchers ...
Cached Biology News:Newborn screening can cause unnecessary parental stress 2Newborn screening can cause unnecessary parental stress 3Zebra finch males prefer females with exaggerated maternal traits 2Vaccine shown effective against chancroid 2Vaccine shown effective against chancroid 3
(Date:8/18/2014)... Tampa, FL (Aug. 18, 2014) -- A new ... South Florida (USF) Morsani College of Medicine and ... the life-threatening complications of interventional cardiovascular disease treatment. ... model that the novel molecular therapy could selectively ... healing following a medical procedure using a balloon ...
(Date:8/18/2014)... Aug. 18, 2014 BioElectronics Corporation ... consumer medical devices said that its EVP ... by CEOLIVE.TV as part of its Executive ... is available at http://ceolive.tv/bioelectronics-corp-otc-biel/biel-videos/2282-ceolive-tv-interview-bioelectronics-corp-otcqb-biel ... to investors the unique advantages of BioElectronics ...
(Date:8/18/2014)... efficiency and data storage may someday run ... polarizations to read and write digital information, ... technology. But ferroelectrics must first overcome a ... habit of "forgetting" stored data. , ... Energy,s Brookhaven National Laboratory have discovered nanoscale ...
(Date:8/18/2014)... August 18, 2014 According ... Market Research "Life Science Reagents Market(Products- PCR Reagent ... Chromatography, In-Vitro Diagnostic Reagents and Others; End Users- ... Clinical Laboratories, and Forensic Laboratories)- Global Industry Analysis, ... 2019", the global life science reagents market was ...
Breaking Biology Technology:Selective therapy may improve artery repair after interventional cardiovascular procedures 2Selective therapy may improve artery repair after interventional cardiovascular procedures 3BioElectronics EVP Dr. Deepak Kotak Interviewed on CEO Live 2BioElectronics EVP Dr. Deepak Kotak Interviewed on CEO Live 3Promising ferroelectric materials suffer from unexpected electric polarizations 2Promising ferroelectric materials suffer from unexpected electric polarizations 3Promising ferroelectric materials suffer from unexpected electric polarizations 4Global Life Science Reagents Market Expected to Reach USD 25.7 Billion in 2019: Transparency Market Research 2Global Life Science Reagents Market Expected to Reach USD 25.7 Billion in 2019: Transparency Market Research 3Global Life Science Reagents Market Expected to Reach USD 25.7 Billion in 2019: Transparency Market Research 4Global Life Science Reagents Market Expected to Reach USD 25.7 Billion in 2019: Transparency Market Research 5
... - ARIUS Research Inc., (TSX:,ARI), a biotechnology company ... today announced that David Young, MD, President and,Chief ... Chinese Global,Financial Forum. Dr. Young will present on ... available prior to and following his presentation at ...
... DuPont Chairman and,CEO Charles O. Holliday, Jr., today told ... the world to keep pace with the rapid,growth in ... "Biotechnology is the most powerful tool available to secure ... holds the promise,to deliver the world more, higher quality ...
... Angiotech Pharmaceuticals,Inc. (NASDAQ: ANPI , TSX: ... company, today announced preliminary financial results from,the ... updated its financial,outlook for the full year ... the,release of Boston Scientific Corporation,s (BSC) third ...
Cached Biology Technology:ARIUS to present at Chinese Global Financial Forum 2Biotechnology Needed to Help Meet Growing Global Needs for Food, Feed, Fuel and Materials, DuPont Chairman & CEO Says at World Food Prize 2Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 2Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 3Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 4Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 5Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 6Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 7Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 8Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 9Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 10Angiotech announces preliminary third quarter financial results and updates fiscal 2007 outlook 11