Navigation Links
Study jointly led by UCSB researcher supports theory of extraterrestrial impact
Date:3/5/2012

(Santa Barbara, Calif.) A 16-member international team of researchers that includes James Kennett, professor of earth science at UC Santa Barbara, has identified a nearly 13,000-year-old layer of thin, dark sediment buried in the floor of Lake Cuitzeo in central Mexico. The sediment layer contains an exotic assemblage of materials, including nanodiamonds, impact spherules, and more, which, according to the researchers, are the result of a cosmic body impacting Earth.

These new data are the latest to strongly support of a controversial hypothesis proposing that a major cosmic impact with Earth occurred 12,900 years ago at the onset of an unusual cold climatic period called the Younger Dryas. The researchers' findings appear today in the Proceedings of the National Academy of Sciences.

Conducting a wide range of exhaustive tests, the researchers conclusively identified a family of nanodiamonds, including the impact form of nanodiamonds called lonsdaleite, which is unique to cosmic impact. The researchers also found spherules that had collided at high velocities with other spherules during the chaos of impact. Such features, Kennett noted, could not have formed through anthropogenic, volcanic, or other natural terrestrial processes. "These materials form only through cosmic impact," he said.

The data suggest that a comet or asteroid likely a large, previously fragmented body, greater than several hundred meters in diameter entered the atmosphere at a relatively shallow angle. The heat at impact burned biomass, melted surface rocks, and caused major environmental disruption. "These results are consistent with earlier reported discoveries throughout North America of abrupt ecosystem change, megafaunal extinction, and human cultural change and population reduction," Kennett explained.

The sediment layer identified by the researchers is of the same age as that previously reported at numerous locations throughout North Am
'/>"/>

Contact: Andrea Estrada
andrea.estrada@ia.ucsb.edu
805-893-4620
University of California - Santa Barbara
Source:Eurekalert  

Page: 1 2

Related biology news :

1. New study will help protect vulnerable birds from impacts of climate change
2. Law that regulates shark fishery is too liberal: UBC study
3. Study by UC Santa Barbara researchers suggests that bacteria communicate by touch
4. Leatherback turtle migration study identifies Pacific danger zones for endangered species
5. Study of wildfire trends in Northwestern California shows no increase in severity over time
6. Study shows earthworms to blame for decline of ovenbirds in northern Midwest forests
7. MU scientists study how to improve pesticide efficiency
8. Studying the importance of biological rhythms for the ecological performance of plants
9. Nowhere to hide: Study finds future of Sumatran tigers threatened by human disturbances
10. Cleveland Clinic Childrens Hospital launches study to genetically test for autism
11. Iowa State, Ames Lab chemists aid study of mutated plants that may be better for biofuels
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Study jointly led by UCSB researcher supports theory of extraterrestrial impact
(Date:7/14/2014)... cases in Sierra Leone showed that about two-thirds of ... and nearly nine percent tested positive for Ebola virus. ... Emerging Infectious Diseases , demonstrates that Ebola virus has ... before the current outbreak. , First author Randal J. ... where he spent six weeks helping to set up ...
(Date:7/14/2014)... in the local environment manage much better in the ... environments. , A world without bees would be ... an additional 600 million to 1 billion Danish kroner ... bees making honey and pollinating a wide range of ... bees all over the world are under pressure from ...
(Date:7/14/2014)... consequence of aging? , Although it is widely thought ... risk of developing several common cancers decreases with age. ... decrease with age in the risk of developing certain ... puzzle was presented in a recent paper published in ... P. Brody of the Department of Biomedical Engineering at ...
Breaking Biology News(10 mins):Sierra Leone samples: Ebola evidence in West Africa in 2006 2Sierra Leone samples: Ebola evidence in West Africa in 2006 3Best for bees to be stay-at-homes 2
... in decks, utility poles and fences will likely leach ... groundwater, according to two research papers published online Wednesday. ... of Florida and Florida International University examined arsenic leaching ... real deck as well as from simulated landfills. , ...
... using MRI to detect magnetic probes of tiny iron ... time has successfully tracked immune-stimulating cells implanted into cancer ... the eight patients, MRI revealed that the implanted cells ... for treatment," says Jeff Bulte, Ph.D., an associate professor ...
... chicken when she crossed the road is less important that what ... , Organic arsenic is fed to poultry to prevent bacterial infections ... up by the tissue and the majority of it is excreted ... urine from under poultry houses -- is rich in nitrogen and ...
Cached Biology News:Researchers: Treated wood poses long-term threat 2Researchers: Treated wood poses long-term threat 3Magnetic probe successfully tracks implanted cells in cancer patients 2Magnetic probe successfully tracks implanted cells in cancer patients 3Geoscientists follow arsenic from chicken feed to streambeds 2
(Date:7/10/2014)... Senior supply chain management executives from over 50 ... of “Reducing Cost, Lead Time, & Defects in the ... the partnership of the Bio Supply Management Alliance ( ... SCMI) of the University of San Diego in ... Institute of Peace and Justice in San Diego, Devendra ...
(Date:7/10/2014)... 2014 On July 9 Prime ... presented Russia,s first national "Industry" ... Company is developing a unique project called MabNext ... a number of innovative drugs based on monoclonal antibodies ... took place at the International Exhibition "Innoprom 2014" in ...
(Date:7/10/2014)... PROVO, Utah , July 10, 2014 ... genome annotation and interpretation, today announced an ... sequencing (NGS) analytics for Lineagen,s NextStep Dx ... evaluation of neurodevelopmental and neurological disorders, currently ... chromosomal microarray (CMA) testing service used by ...
(Date:7/10/2014)... July 10, 2014   Ceres, Inc . (Nasdaq: ... company, announced today financial results for the three months ... its business. Ceres reported that the company ... performance this growing season in Brazil, which concluded in ... company,s sorghum evaluation areas for part of the growing ...
Breaking Biology Technology:Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 2Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 3Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 4Dmitry Medvedev Presented BIOCAD the First National "Industry" Award 2Tute Genomics Platform Selected to Provide Clinical Interpretation for Lineagen's NextStepDx PLUS Next-Generation Sequencing-Based Diagnostic Test 2Tute Genomics Platform Selected to Provide Clinical Interpretation for Lineagen's NextStepDx PLUS Next-Generation Sequencing-Based Diagnostic Test 3Tute Genomics Platform Selected to Provide Clinical Interpretation for Lineagen's NextStepDx PLUS Next-Generation Sequencing-Based Diagnostic Test 4Ceres Announces Fiscal Third Quarter 2014 Financial Results 2Ceres Announces Fiscal Third Quarter 2014 Financial Results 3Ceres Announces Fiscal Third Quarter 2014 Financial Results 4Ceres Announces Fiscal Third Quarter 2014 Financial Results 5Ceres Announces Fiscal Third Quarter 2014 Financial Results 6Ceres Announces Fiscal Third Quarter 2014 Financial Results 7Ceres Announces Fiscal Third Quarter 2014 Financial Results 8Ceres Announces Fiscal Third Quarter 2014 Financial Results 9
... ... Hermes Biosciences and partnership with sanofi-aventis , ... Cambridge, MA (PRWEB) April 7, 2010 -- Merrimack Pharmaceuticals, Inc., ... for cancer and inflammation, today announced that William Sullivan has been promoted to Vice ...
... have found a way to turn a precision measurement device ... researchers adapted a device known as an optical frequency comb ... data operations that will be vital for future quantum computers. ... Review Letters and is described in a Viewpoint article ...
... ... to build and sell "Flexible Fuel" cars, as would be required by ... the impact of the stricter fuel efficiency standards announced today by President ... President,s announcement, advocates of energy independence challenged the President to show his ...
Cached Biology Technology:Merrimack Pharmaceuticals Promotes William Sullivan to Vice President of Finance 2Challenge President to Adopt Energy Measure with Double the Impact of Improved Auto Fuel Efficiency Standards at Fraction of the Cost 2
Agarose, pulse field, 250 g. Nuclease-free.Gel point (1.5%): 36 1.5 C, EEO (-mr): 1800 g/cm2. Category: Nucleotides & Enzymes & Biochemicals, Ultrapure Biochemicals ....
100 adhesive strips....
Request Info...
Molecular Biological Resources has extensive abilities cloning and expression of prokaryotic and eukaryotic proteins. Please contact lloconne@molbiores.com to discuss your project. Contact lloconne@...
Biology Products: