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  

3

GOOD

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:6/19/2013)... June 19, 2013 MedNet Solutions , ... study management systems, is pleased to announce its participation ... June 23-27 in Boston .  This ... recognized leader in cloud-based eClinical solutions, has exhibited at ... showcasing iMedNet™ EDC , MedNet,s latest, ...
(Date:6/19/2013)... the most perfectly spherical large objects in nature may ... new study. It appears in ACS, journal Langmuir ... Julyan Cartwright, Antonio G. Checa and Marthe Rousseau point ... have perhaps the most perfectly spherical, or ball-like, shape ... without a microscope. Pearls develop as nacre (mother of ...
(Date:6/19/2013)... 2012, the European Medicines Agency (EMA) approved the ... ever gene therapy for clinical use in the ... developed AAV-LPL S447X for the treatment of a ... (LPLD) which affects approximately one or two out ... life-threatening inflammations of the pancreas. Afflicted individuals carry ...
Breaking Biology News(10 mins):MedNet Solutions To Spotlight iMedNet EDC At The 49th DIA Annual Meeting 2No danger of cancer through gene therapy virus 2
... Cones, holes and temporary traffic lights the scourge of ... together to reduce the misery of motorists caused by ... under the tarmac. They,ll reveal how new technology will ... digging. A sector-wide seminar at The University of ...
... New Orleans, LA Research led by David Worthylake, PhD, ... Sciences Center New Orleans, may help lay the groundwork for ... cancer. The research will be published in the May 29, ... During the transition from a localized tumor to metastatic ...
... NOT trying to assert their dominance over their canine ... at the University of Bristol,s Department of Clinical Veterinary ... Applications and Research . The researchers spent six ... rehoming centre, and reanalysing data from studies of feral ...
Cached Biology News:Reducing the roadworks 2Reducing the roadworks 3LSUHSC research describes function of key protein in cancer spread 2Using 'dominance' to explain dog behavior is old hat 2
(Date:6/19/2013)... Biotechnology industry pioneer Amgen (NASDAQ: ... BlackLine Systems  and enterprise application software leader ... webinar next week entitled "No Account Left Behind!  ... to Help Keep Its Account Reconciliations in Good Shape ... The webinar, geared at finance, accounting, audit and compliance ...
(Date:6/19/2013)... BioConvergence team members Curtis Strother ... 2013’s BioLogistics Summit in San Francisco earlier this ... Chain IQ and IQPC, addressed the increasingly complex ... part, attributed to current trends of globalization, outsourcing, ... trends is an increase in movement, which is ...
(Date:6/19/2013)... Applied Rigaku Technologies, Inc. is pleased ... measurement of sulfur in ultra-low sulfur diesel (ULSD) using ... EDXRF analyzer . The analysis detailed in Rigaku Application ... This International Standard specifies an energy dispersive X-ray ... content in automotive gasoline. , Regulations around the world ...
(Date:6/19/2013)... 19, 2013 Express Diagnostics Int’l, Inc., ... announced that it has received Class III medical device ... its DrugCheck® NxStep Onsite Drug Screen Cup ... rapid screening device in near-patient settings, such as physicians’ ... received Health Canada Class III approval for 24 different ...
Breaking Biology Technology:Amgen Joins BlackLine Systems, SAP for Webinar on Automating Account Reconciliations 2Amgen Joins BlackLine Systems, SAP for Webinar on Automating Account Reconciliations 3Amgen Joins BlackLine Systems, SAP for Webinar on Automating Account Reconciliations 4BioConvergence® Presents at BioLogistics Summit on Risk Matrix for Biosamples during Shipment 2Rigaku Publishes New Application Note for Analysis of ULSD Per ISO 13032 2Express Diagnostics’ DrugCheck® On-site Test Cup Receives Health Canada Class III Medical Device Approval 2Express Diagnostics’ DrugCheck® On-site Test Cup Receives Health Canada Class III Medical Device Approval 3
... Encorium Group, Inc. (Nasdaq: ENCO ), a full service ... for many of the world,s leading pharmaceutical and biotechnology companies, today ... Nasdaq stating that since it had not, as of the date ... June 30, 2009, it was then no longer in compliance with ...
... , MURRIETA, Calif., Aug. 27 Despite ... of its US operations. Copan Diagnostics, Inc. is undertaking a ... and additional medical device manufacturing operations to its facility in ... molding machinery and filling and packing equipment to expand Copan,s ...
... , , , , ... PPHM ) today announced that it will release its financial results for ... 7:00 a.m. EDT and will host a conference call and webcast to ... , Peregrine,s senior management will discuss financial results for ...
Cached Biology Technology:Encorium Announces Receipt of Letters from Nasdaq Regarding its Second Quarter 2009 Form 10-Q Filing 2Encorium Announces Receipt of Letters from Nasdaq Regarding its Second Quarter 2009 Form 10-Q Filing 3Copan Announces Multimillion Expansion for US Pipet Manufacturing Operations 2Peregrine Pharmaceuticals to Report First Quarter FY 2010 Financial Results 2
... BAS-2500 is ideal for ... Biology (1D electrophoresis, 2D ... Macroarrays); Pharmacokinetics & Toxicology ... layer chromatography); Physical and ...
BlotGel application pool -see Blotters (Semi-Dry) for more info...
When added to either StemSep CD4+ or CD8+ T Cell Enrichment cocktails, human HLA-DR TAC is designed to deplete human HLA-DR from samples to isolate resting CD4+ or CD8+ T cells....
When added to StemSep T Cell Enrichment cocktail, human TCRab TAC is designed to deplete human TCRab from samples to isolate gd T cells....
Biology Products: