Navigation Links
Princeton geoscientist offers new evidence that meteorite did not wipe out dinosaurs
Date:5/4/2009

r major events widely separated in time in that area of Mexico as well as in Texas. The oldest of the four events is the Chicxulub impact, seen by the fallout of glass beads. The second is about 150,000 years later and seen in a layer of sandstone with Chicxulub impact glass beads that were transported from shallow shore areas into deep waters during a sea level fall and was commonly interpreted as a tsunami generated by the Chicxulub impact. About 100,000 to 150,000 years later, the third event struck at the time of the K-T boundary with its iridium layer and mass extinction. This event may represent a second large impact or massive volcanism. The fourth event is possibly a smaller impact as evidenced by another iridium layer about 100,000 years after the mass extinction.

Advocates of the Chicxulub impact theory suggest that the impact crater and the mass extinction event only appear far apart in the sedimentary record because an earthquake or tsunami caused slumps and mixing of sediments surrounding the Gulf of Mexico. To date no evidence of major disturbance has been found in the sediments.

Keller says her team's newest research, however, confirms what she has found in earlier studies -- that the sandstone complex that overlays the impact layer was not deposited over hours or days by a tsunami but over a long time period. From El Peon in Mexico and other sites listed in the new study, the scientists were able to calculate that between 13 and 30 feet of sediments were deposited at a rate of about an inch per thousand years after the impact. These sediments separating the impact layer from the sandstone complex and the overlying mass extinction were formed by normal processes. There is evidence of erosion and transportation of sediments in the sandstone layers, but no evidence of structural disturbance, Keller said.

Also at El Peon, the researchers found 52 species present in sediments below the impact layer and counted all 52 still pres
'/>"/>

Contact: Kitta MacPherson
kittamac@princeton.edu
609-258-5729
Princeton University
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Princeton engineers develop low-cost recipe for patterning microchips
2. Gift of $100 million to transform energy and environment research at Princeton
3. Princeton-led team finds secret ingredient for the health of tropical rainforests
4. Princeton researchers discover new type of laser
5. 2007 Albert Maucher Prize for Outstanding Young Geoscientists
6. Nature publishes new evidence about the deep biosphere written by biogeoscientists
7. Geoscientists discuss sea level rise, extreme storm events and more
8. Geoscientists meet to discuss Rocky Mountain geology
9. New partnership offers outsourced R&D in membrane biology
10. Census of protein architectures offers new view of history of life
11. NAS report offers new tools to assess health risks from chemicals
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Princeton geoscientist offers new evidence that meteorite did not wipe out dinosaurs
(Date:4/20/2014)... known that people with Down syndrome have a heightened ... they haven,t been able to explain why. Now, ... a connection between the two conditions. , In a ... Genetics , the researchers track the genetic chain of ... to the cellular havoc that occurs in ALL. ...
(Date:4/18/2014)... X-ray crystallography and nuclear magnetic resonance imaging (NMR) to ... but such efforts have long been hampered by the ... molecule and often in ordered and crystalized form to ... peer into the structure of most molecules. , Harvard ... thing of the past. , A team of ...
(Date:4/18/2014)... adds a twist to the story of how barnyard chickens ... 21 in the journal Proceedings of the National Academy ... chickens that lived 200-2300 years ago in Europe, researchers report ... have looked far different from the chickens we know today. ... associate with modern domestic chickens -- such as their yellowish ...
Breaking Biology News(10 mins):Dana-Farber researchers uncover link between Down syndrome and leukemia 2Dana-Farber researchers uncover link between Down syndrome and leukemia 3MRI, on a molecular scale 2MRI, on a molecular scale 3Ancient DNA offers clues to how barnyard chickens came to be 2
... Solutions, a global life sciences technology solutions company ... to announce the latest release of ENLIGHTEN ... ENLIGHTEN system, which provides a proven, highly ... clinical trial management system (CTMS), has effectively supported ...
... University of Tennessee, Knoxville, researchers have found ... an estrogen-like compound in the environment which could ... adversely affect fish, plants and human health. Previously, ... these impacts. Theodore Henry, an adjunct ...
... is pleased to announce the recipients of the 2010 ... Advancement of Biotherapy. The 6 award winners were presented ... in Los Angeles; they are: David Armstrong, MD, DPM, ... MD, MPH; Kosta Mumcuoglu, PhD; and Aletha Tippett, MD, ...
Cached Biology News:MedNet Solutions Announces Significant Enhancements to ENLIGHTEN, Its Flagship EDC / eClinical Solution 2UT researchers link algae to harmful estrogen-like compound in water 2BTER Foundation announces winners of the William S. Baer Award 2BTER Foundation announces winners of the William S. Baer Award 3
(Date:1/14/2014)... January 14, 2014 Carahsoft and CDS ... January 23, 2014 at 2pm EST (11am PST), “Natural ... topic focuses on how technology can turn raw, heterogeneous ... for government agencies. The online webinar will last approximately ...
(Date:1/14/2014)... Jan. 14, 2014 The largest international professional ... plants and therapeutic derivatives thereof has endorsed an ... researchers about the challenges of adulterated herb and ... The Society for Medicinal Plant ...
(Date:1/14/2014)... Rockville, MD (PRWEB) January 14, 2014 ... dedicated to developing innovative information technology solutions for ... other health care stakeholders, announced today the signing ... the US Food and Drug Administration (FDA). ...
(Date:1/14/2014)... Independent publisher Bitingduck Press, with offices in Altadena ... ideas for 2014 in production and sales of interactive ... high-quality, low-cost, DRM-free ebooks and to use the sales ... first major development will be bookstore sales in local ...
Breaking Biology Technology:Webcast - Natural Language Processing: Converting Raw Data into Actionable Knowledge – Hosted by Carahsoft and CDS Federal Services 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 3World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 4World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 5World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 6World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 7World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 8Global Record Systems Announces Research Collaboration Agreement with FDA to Create a Novel “Big Data” Paradigm for Collection of Patient Safety and Outcomes Information 2Bitingduck Press Looks Forward to 2014 With Multimedia E-books 2
... is the First Latin American Country to ... Massachusetts, February 13, Shire plc (LSE: SHP)(NASDAQ: ... company, announced that ELAPRASE(R),(idursulfase), a human enzyme ... has been approved for commercial sale by ...
... 2008 Earnings Guidance and Introduces Q1 2008 Guidance, ... (Nasdaq:,CEPH) today reported 2007 sales of $1.727 billion, ... the company,s previously issued,guidance. Basic loss per common ... the previously announced settlement reserve, amortization expense,and certain ...
... Blood Bank,is proud to announce that two-time defending NASCAR ... "We,re honored to have this,NASCAR superstar and terrific person ... of CORD:USE. Jimmie Johnson joins CORD:USE as a,spokesperson to ... "I,m excited about telling people the benefits of ...
Cached Biology Technology:Shire's ELAPRASE(R) (idursulfase) Approved in Mexico for Treatment of Hunter Syndrome 2Shire's ELAPRASE(R) (idursulfase) Approved in Mexico for Treatment of Hunter Syndrome 3Shire's ELAPRASE(R) (idursulfase) Approved in Mexico for Treatment of Hunter Syndrome 4Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 2Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 3Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 4Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 5Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 6Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 7Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 8Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 9Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 10Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 11Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 12Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 13Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 14Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 15Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 16Cephalon's 2007 Results Exceed Full Year Sales and Earnings Guidance 17Two-time Defending NASCAR Sprint Cup Series Champion Jimmie Johnson Joins the Team at CORD:USE Cord Blood Bank to Help Win the Race for Life 2
... GRADE ,5-Bromo-4-chloro-3-indoxyl-beta-D-galactopyranoside C 14 H ... 6 ,M.W.= 408.63 ,Assay: Greater ... in DMF) ,Biological Activity: Blue color ... Analysis: Agrees with theoretical values ,Thin ...
BD IMagnet 1 each...
... A.P. Johnstone and M.W. Turner ... strategies and methods used in the ... of antibodies in immunoassays, the standardisation ... ELISA techniques including amplification systems, enzyme ...
MitoScreen (JC-1) Kit , 100 tests Consult technical datasheet for details....
Biology Products: