Navigation Links
Extinction by asteroid a rarity
Date:10/7/2008

In geology as in cancer research, the silver bullet theory always gets the headlines and nearly always turns out to be wrong.

For geologists who study mass extinctions, the silver bullet is a giant asteroid plunging to earth.

But an asteroid is the prime suspect only in the most recent of five mass extinctions, said USC earth scientist David Bottjer. The cataclysm 65 million years ago wiped out the dinosaurs.

"The other four have not been resolvable to a rock falling out of the sky," Bottjer said.

For example, Bottjer and many others have published studies suggesting that the end-Permian extinction 250 million years ago happened in essence because "the earth got sick."

The latest research from Bottjer's group suggests a similar slow dying during the extinction 200 million years ago at the boundary of the Triassic and Jurassic eras.

At the 2008 Joint Annual Meeting of the Geological Society of America, USC doctoral student Sarah Greene drew similarities between ocean conditions at the Triassic-Jurassic boundary and after the end-Permian extinction.

At both those times, bouquet-like structures of aragonite crystals formed on the ocean floor. Such structures are extremely rare in Earth's history, Greene said.

"The fact that these deposits have only been found at these two specific times that are associated with mass extinction suggests at the very least that maybe there's some shared ocean geochemistry that could be related to the cause of the extinctions," Greene said.

"The Triassic-Jurassic extinction cause is totally up for grabs at the moment," she added.

Also at the meeting, USC doctoral student Rowan Martindale presented results from her studies of coral reefs during the Triassic-Jurassic extinction.

"The coral reefs look actually very similar to modern coral reefs," she said. "At the end-Triassic mass extinction, you lose all your reef systems. And nobody'
'/>"/>

Contact: Carl Marziali
marziali@usc.edu
213-740-4751
University of Southern California
Source:Eurekalert

Page: 1 2

Related biology news :

1. Mass extinctions and the evolution of dinosaurs
2. Study of islands reveals surprising extinction results
3. A recipe for saving the worlds oceans from an extinction crisis
4. Extinction most likely for rare trees in the Amazon rainforest
5. Oceans on the precipice: Scripps scientist warns of mass extinctions and rise of slime
6. Smithsonian hosts tropical extinction debate in Panama
7. Rare Antarctic fossils reveal extinction of tundra before full polar climate arrived
8. Ivory poaching at critical levels: Elephants on path to extinction by 2020?
9. Newly discovered monkey is threatened with extinction
10. 1/3 of reef-building corals face extinction
11. The mystery of mass extinctions is no longer murky
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/28/2014)... -- Scientists have identified the developmental on-off switch for ... produce more than two-thirds of the world,s naturally derived ... to see whether it is possible to manipulate this ... , The study, appearing August 28 in Cell ... molecule called cyclic-di-GMP and a larger protein called BldD ...
(Date:8/28/2014)... systems are good examples of complex systems. Their ... networkincluding water for cooling, transport to supply fuel, ... step in the network chain is interconnected with ... dependent. A team of UK-based scientists has studied ... The findings have been published in EPJ B ...
(Date:8/28/2014)... . Cars, planes ... of sophisticated assembly lines. Mobile assembly carriers, on to which ... assembly lines. In the case of a car body, the ... a precise spatial and chronological sequence, resulting in a complete ... of such an assembly line at molecular level has been ...
Breaking Biology News(10 mins):Small molecule acts as on-off switch for nature's antibiotic factory 2Small molecule acts as on-off switch for nature's antibiotic factory 3Inter-dependent networks stress test 2Nanoscale assembly line 2Nanoscale assembly line 3
... UT Southwestern Medical Center ophthalmologists will be the first in ... to fix nearsightedness. , "Think of it as a contact ... who is inserting the new implantable collamer lens, or ICL, ... , The ICL can replace or reduce the need for ...
... A new UCLA imaging study shows that age-related breakdown ... wiring, correlates strongly with the presence of a key ... are detailed in the January edition of the peer-reviewed ... growing body of evidence that myelin breakdown is a ...
... Survey released a report describing the occurrence of pesticides ... concludes that pesticides are typically present throughout the year ... the Nation, but are less common in ground water. ... at concentrations likely to affect humans. However in ...
Cached Biology News:New 'implanted contacts' designed to fix nearsightedness 2Imaging study links key genetic risk for Alzheimer's disease to myelin breakdown 2Pesticides in the nation's streams and ground water 2Pesticides in the nation's streams and ground water 3Pesticides in the nation's streams and ground water 4
(Date:8/28/2014)... 2014 Whitehouse Laboratories is excited to ... with PTI Inspection Systems that will enable ... the art leak testing method development and validation programs ... available. As part of this agreement, Whitehouse Labs has ... Detection Instrument developed and manufactured by PTI. The ...
(Date:8/27/2014)... (PRWEB) August 27, 2014 Green & ... in Series B funding and secured Otter Capital as ... capital will accelerate commercialization of GGI’s Agriplier™ technology, building ... types. , “Since our first meeting, we have ... the biological product space,” said Alan Sobba, President and ...
(Date:8/27/2014)... Livermore, California (PRWEB) August 27, 2014 ... (LLNL), through Lawrence Livermore National Security ... million to develop and deliver a state-of-the-art laser ... Beamlines facility (ELI Beamlines), under construction in the ... design performance, the laser system, called the " ...
(Date:8/27/2014)... Aug. 27, 2014   MSC , a healthcare ... today announced the appointment of Mary Beth Loesch ... 28 years of experience preparing companies for rapid growth ... Executive Vice President of Corporate Development and Healthcare. In ... business , as well as corporate strategy and marketing. ...
Breaking Biology Technology:Whitehouse Labs Renews Partnership with PTI Inspection Systems 2Whitehouse Labs Renews Partnership with PTI Inspection Systems 3Green & Grow Inc. Secures $6M Series B Funding from Otter Capital 2Green & Grow Inc. Secures $6M Series B Funding from Otter Capital 3LLNL Synchs up with ELI Beamlines on Timing System 2LLNL Synchs up with ELI Beamlines on Timing System 3MSC names Mary Beth Loesch President and CEO 2
... Reports Results for the Nine Month Period Ended September ... ... Genmab A/S,(OMX: GEN) announced today results for the nine-month period ended,September 30, ... DKK 667 million (USD 128 million) for the nine,month period ended September ...
... BOSTON, Oct. 29 PAREXEL International,Corporation (Nasdaq: ... services,provider, in partnership with Glenmark Pharmaceuticals Ltd, ... the Good Clinical Practice Journal (GCPj) as,the ... Strategy Award. The,award recognizes the impressive collaborative ...
... announced today the,successful completion of a EUR ... in the development and commercialization of Furanics, ... improvement of,pharmaceutical products. The financing will be ... The focus of the next-generation biofuel,and bioplastic ...
Cached Biology Technology:Genmab Announces Results for the First Nine Months of 2008 2Genmab Announces Results for the First Nine Months of 2008 3Genmab Announces Results for the First Nine Months of 2008 4Genmab Announces Results for the First Nine Months of 2008 5PAREXEL Partners with Glenmark to Win the Good Clinical Practice Journal Award for Most Innovative Patient Recruitment Strategy 2PAREXEL Partners with Glenmark to Win the Good Clinical Practice Journal Award for Most Innovative Patient Recruitment Strategy 3PAREXEL Partners with Glenmark to Win the Good Clinical Practice Journal Award for Most Innovative Patient Recruitment Strategy 4PAREXEL Partners with Glenmark to Win the Good Clinical Practice Journal Award for Most Innovative Patient Recruitment Strategy 5Avantium Completes EUR 18 Million Financing Round 2Avantium Completes EUR 18 Million Financing Round 3Avantium Completes EUR 18 Million Financing Round 4
... Pierce offers maleimide activated carrier proteins ... conjugates. Imject Maleimide Activated Carrier Proteins ... been preactivated with a heterobifunctional cross-linker ... stable, sulfhydryl-reactive carrier protein. Thus ...
Cell Culture Flask, 25 cm, tissue-culture treated polystyrene...
Cell Culture Flask, nontreated polystyrene...
iNOS/NOS Type II Purified Anti-Mouse, Anti-Rat, Anti-Human clone Polyclonal, Isotype Rabbit Ig, 150 µg Consult technical datasheet for details....
Biology Products: