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:9/19/2014)... for the sake of fairness per se but in ... say Frans de Waal, PhD, and Sarah Brosnan, PhD, ... which is defined as a negative reaction to unequal ... , Their conclusion comes after the co-authors reviewed ... that it is the evolution of forestalling partner dissatisfaction ...
(Date:9/18/2014)... PULLMAN, Wash. - Washington State University researchers have developed ... sediment to power waste cleanup in rural areas. ... lead to an inexpensive and quick way to clean ... treatment plants while reducing pollution. , Professor Haluk ... College of Engineering and Architecture discuss the system in ...
(Date:9/18/2014)... 18, 2014 New research into the Crimean-Congo hemorrhagic ... severe hemorrhagic disease in humans similar to that caused ... CCHFV infection. This discovery has the potential to lead ... , The research, reported in a paper ... and conducted by scientists at the Texas Biomedical Research ...
Breaking Biology News(10 mins):Evolution of responses to (un)fairness 2Evolution of responses to (un)fairness 3Researchers develop unique waste cleanup for rural areas 2Research milestone in CCHF virus could help identify new treatments 2
... fuel sources are lighting a fire under research to turn ... Bill 20, signed this week by Gov. Rick Perry, compliments ... used. The new law requires more renewable energy to be ... consumer energy needs and agriculture industry trends with the legislation ...
... some day be defeated by a single treatment, according ... University of Georgia's College of Veterinary Medicine. , Their ... and Marburg and includes investigators from Vanderbilt University Medical ... The study is being funded by a grant from ...
... Berkeley, has found that damage to a cell's DNA sets ... of a marker recognized by the body's immune system. , ... advanced online issue of Nature, shed light on a long-standing ... are able to attack tumors - can differentiate cells that ...
Cached Biology News:Researchers find ways to turn manure into power 2Researchers find ways to turn manure into power 3Researcher at UGA College of Veterinary Medicine identifies new way of combating viral diseases 2New study finds how cells with damaged DNA alert the immune system 2New study finds how cells with damaged DNA alert the immune system 3
(Date:9/21/2014)... Chemical Sciences play a significant role in meeting ... safe water, healthy food, and dependable medicine from ... educators, and scientists have a great role in ... for the national development, and to foster research ... emerging Sciences, accelerating with a tremendous speed to ...
(Date:9/19/2014)... (Nasdaq: ITMN ) today announced that it ... litigation in the Delaware Court of Chancery relating to ... August 22, 2014, among Roche Holdings, Inc., Klee Acquisition ... Memorandum of Understanding, the Company agreed to make certain ... the amendment to the Company,s Schedule 14D-9 to be ...
(Date:9/19/2014)... 2014 Follow us on ... revolutionize the world has attracted diverse players including ... start-ups. The early years of nanotechnology development was ... to the high risks involved, which deterred private ... this evolving technology have been growing over the ...
(Date:9/19/2014)... , Sept. 19, 2014 Pfenex Inc. (NYSE ... development of high-value and difficult to manufacture proteins including ... at the 21 st Annual NewsMakers in the ... . Bertrand Liang , chief executive officer of ... programs and business strategy on Friday, September 26, 2014 ...
Breaking Biology Technology:Chemistry for Global Development during the Open Access Week 2Chemistry for Global Development during the Open Access Week 3InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 2InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 3InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 4InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 5InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 6InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 7InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 8InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 9InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 10InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 11InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 12InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 13InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 14InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 15InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 16InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 17InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 18InterMune Reports Memorandum of Understanding in Connection with Consolidated Delaware Action 19Growing R&D Investments & Developments in Nanomaterials to Drive the Global Nanotechnology Market, According to New Report by Global Industry Analysts, Inc. 2Growing R&D Investments & Developments in Nanomaterials to Drive the Global Nanotechnology Market, According to New Report by Global Industry Analysts, Inc. 3Growing R&D Investments & Developments in Nanomaterials to Drive the Global Nanotechnology Market, According to New Report by Global Industry Analysts, Inc. 4Pfenex to Present at Upcoming Industry Conference on September 26 2
... ARAY ), a global leader in ... official journal of the Congress of Neurological,Surgeons, has ... , The supplement, titled ... different countries, focused on brain and spine,treatment using ...
... Inc. (ERT), (Nasdaq: ERES ), ... to provide integrated Cardiac Safety and Ambulatory ... to clinical trial sponsors and managers worldwide.eResearchTechnology ... (ECG), eClinical technology, ePRO, and other services ...
... Cell Technologies, Inc., a leader in adult stem cell production, announced ... Dr. Bayer will be responsible for developing pre-clinical and clinical ... trials using Stemedica products. , ... San Diego, CA ...
Cached Biology Technology:Neurosurgery Journal Issues Supplement Dedicated to CyberKnife Radiosurgery Experience 2Neurosurgery Journal Issues Supplement Dedicated to CyberKnife Radiosurgery Experience 3Neurosurgery Journal Issues Supplement Dedicated to CyberKnife Radiosurgery Experience 4ERT (eResearchTechnology, Inc.) and Integrium, LLC Form Alliance to Deliver Integrated Cardiac Safety and Ambulatory Blood Pressure Monitoring Services 2ERT (eResearchTechnology, Inc.) and Integrium, LLC Form Alliance to Deliver Integrated Cardiac Safety and Ambulatory Blood Pressure Monitoring Services 3ERT (eResearchTechnology, Inc.) and Integrium, LLC Form Alliance to Deliver Integrated Cardiac Safety and Ambulatory Blood Pressure Monitoring Services 4Stemedica Announces the Appointment of Dr. Michael Bayer as Director, Medical Services 2Stemedica Announces the Appointment of Dr. Michael Bayer as Director, Medical Services 3
... is a 17 amino acid synthetic peptide whose sequence is from ... to carboxy terminus): C - N(217) - Q - P ... A - T - P - N - Y - T ... be used for neutralization and control experiments with the polyclonal antibody ...
... which no antibody exists? Having difficulty generating antibodies ... variety of pharmaceutical, biotech and academic researchers and ... and expertise in antibody generation to work for ... development technology , High affinity and high specificity ...
... Library Panels were designed for full-length gene ... PCRs to identify the desired cDNA clone. ... a 96-well "Master Plate," where each well ... identified the positive well(s) by gel electrophoresis ...
... cDNA Library Panels were designed for full-length ... of PCRs to identify the desired cDNA ... in a 96-well "Master Plate," where each ... Having identified the positive well(s) by gel ...
Biology Products: