Navigation Links
Geologists revisit the Great Oxygenation Event
Date:8/19/2010

much for the world ocean.

It's Complicated "Recent geochemical evidence indicates that, at least locally, ferruginous (iron rich) or even sulphidic (sulfur rich) conditions persisted through the Ediacaran period, long after the Great Oxygenation Event," Fike says.

"Things are much more complicated than we had supposed."

"As a community, we don't have a good sense of the spatial variation of these zones within different bodies of water, " says Fike.

"What's more, different assessments can arise from the interpretation of different geochemical proxies, from physical separation between different ocean basins, or from the reworking of sediments after deposition," he continues.

The underlying problem is a low sampling rate. "As we try to unravel these changes in Earth's history, " Fike says, "we often don't have 100 different places where we can measure rocks of the same age. We're stuck with a few samples, and the natural tendency is to take your rocks and extrapolate."

The only way "to wring order from the chaos," Fike says, is to develop a full three-dimensional model of the Earth that has enough spatial resolution to wash out bad data.

Mystery of the vanishing acritarchs "If you map out redox proxies in enough spatial detail, you can tell a beautiful, consistent story that relates environmental change to the paleontological record," Fike says.

To illustrate, he tells the story of a group of spiny acritarchs, microfossils found in the one of the oldest fossil beds on Earth, the Doushantuo formation in south China.

Nobody was really sure what the acritarchs were. Some people thought they were green algae. Others thought they might be dinoflagellates that had evolved spines to avoid predation by animals.

"Scientists looking at the Doushantuo thought they understood what they were seeing," Fike says. "Oxygen is appearing, the acritarchs are evolving, and this is the start of the b
'/>"/>

Contact: Diana Lutz
dlutz@wustl.edu
314-935-5272
Washington University in St. Louis
Source:Eurekalert  

Page: 1 2 3 4 5 6

Related biology news :

1. Brown geologists show unprecedented warming in Lake Tanganyika
2. Geologists studying groundwater arsenic levels in India empower Bengali women, children
3. University of Leicester geologists demonstrate extent of ancient ice age
4. Geologists map rocks to soak CO2 from air
5. 30 years later, what killed the dinosaurs is revisited
6. New research aims to unravel how phosphorus pollution drives toxic algal blooms in the Great Lakes
7. NOAA awards $2.5 million for research on invasive species in the Great Lakes
8. Children born after assisted reproduction at greater risk of congenital malformations
9. Fossil-fuel use and feeding world cause greatest environmental impacts: UNEP panel
10. The great pond experiment: Regional vs. local biodiversity
11. Small mammals -- and rest of food chain -- at greater risk from global warming than thought
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Geologists revisit the Great Oxygenation Event
(Date:8/27/2014)... Orange, NJ. August 27, 2014. Using functional near ... differential brain activation patterns between people with multiple ... first MS study in which brain activation was ... task. The article, "Neuroimaging and cognition using functional ... published online on June 11 by Brain ...
(Date:8/27/2014)... it only requires nerve cells to rearrange existing patterns ... generate new patterns, a study of monkeys has found. ... recordings of electrical activity of brain cell networks. The ... Health. , "We looked into the brain and may ... the box," said Aaron Batista, Ph.D., an assistant professor ...
(Date:8/27/2014)... carefully to someone, the first thing we do is ... moving altogether. This strategy helps us hear better by ... This interplay between movement and hearing also has a ... long suggested that the brain,s motor cortex, which controls ... to our conscious perception of sound. , A new ...
Breaking Biology News(10 mins):Kessler Foundation researchers publish first study of brain activation in MS using fNIRS 2Scientists plug into a learning brain 2Scientists plug into a learning brain 3Stop and listen: Study shows how movement affects hearing 2Stop and listen: Study shows how movement affects hearing 3
... and squishing microalgae in a pressure-cooker can fast-forward the ... of Michigan professors are working to understand and improve ... of affordable biofuels that could replace fossil fuels and ... possibility of other new fuel sources such as E. ...
... way to simplify lab-on-a-chip devices that could offer ... of Michigan researchers have created microfluidic integrated circuits. ... flow of electricity on computer chips without external ... fluid through their devices without instructions from outside ...
... 2010 Tel Aviv University President Professor, ... together a myriad of seemingly unrelated chemical reactions creating a ... Chemistry on April 18 , contributes to our understanding ... motion of molecules or other particles within that medium, determining ...
Cached Biology News:Pressure-cooking algae into a better biofuel 2Microfluidic integrated circuit could help enable home diagnostic tests 2Microfluidic integrated circuit could help enable home diagnostic tests 3Tel Aviv University President Co-authors Important Paper Unraveling the Effect of Spatial Organization on Intracellular Chemistry 2Tel Aviv University President Co-authors Important Paper Unraveling the Effect of Spatial Organization on Intracellular Chemistry 3
(Date:8/27/2014)... , Aug. 27, 2014 Guggenheim Securities, ... Partners, today announced the hiring of veteran equity analyst ... equity analyst. Mr. Butler will focus on the biotech/biopharma ... team a wealth of experience and a broad network ... , Senior Managing Director and Head of Equities at ...
(Date:8/27/2014)... Westminster, CO (PRWEB) August 27, 2014 ... image analysis services to the pharmaceutical and medical ... and expansion. The fast growing company has consolidated ... in Aurora and Boulder to Westminster, CO, just north ... and Histology Lab, 7575 W. 103rd Ave., Suite 100, ...
(Date:8/27/2014)... DUBLIN , Aug. 27, 2014 ... "Global Stable Isotope Ratio Mass Spectrometer Industry Report ... The Global Stable Isotope Ratio Mass Spectrometer Industry Report ... current state of the global isotope ratio mass spectrometer ... of the industry including definitions, classifications, applications and industry ...
(Date:8/27/2014)... 2014 Tris Pharma, a specialty pharmaceutical company ... that it has been selected as an award winner ... 2014 Awards for Excellence competition in the Business ... of judges from SCORE (Counselors to America,s Small Business) ... honored at a gala event to be held on ...
Breaking Biology Technology:Guggenheim Securities Hires Analyst Charles "Tony" Butler to Expand Healthcare Coverage 2Flagship Biosciences Announces Relocation and Expansion 2Global Stable Isotope Ratio Mass Spectrometer Industry Report 2014 2Tris Pharma Selected as an award winner in the New Jersey Business & Industry Association's 2014 Awards for Excellence 2
... increases its science and technology (S&T) investment in unmanned ... including autonomy and littoral operations, ONR,s director of innovation ... "We are tackling those issues to find the ... Dr. Larry Schuette, ONR,s director of innovation, at AUVSI,s ...
... Southampton researchers have developed new nano-structured glass, turning it ... in optical manipulation and will significantly reduce the cost ... polarized optical vortex converter created by femtosecond laser nanostructuring ... a team led by Professor Peter Kazansky at the ...
... WOBURN, Mass., Aug. 18, 2011 CBI is pleased ... Annual Registries and Post-Approval Studies Congress, being held September ... REGISTRAT-MAPI, boasts an impressive speaker lineup from Celgene, Covidien, ... and many more. Attendees have the ...
Cached Biology Technology:Office of Naval Research taking on challenges of unmanned underwater vehicles 2New nanostructured glass for imaging and recording 2FDA, NIH to Speak at CBI's 14th Annual Registries and Post-Approval Studies Congress 2
Mouse polyclonal antibody raised against a partial recombinant KCTD13. NCBI Entrez Gene ID = 253980...
Mouse monoclonal antibody raised against a partial recombinant SCARB2. NCBI Entrez Gene ID = SCARB2...
Mouse monoclonal antibody raised against a partial recombinant FAAH. NCBI Entrez Gene ID = FAAH...
Alpha-2-antiplasmin precursor (Alpha-2-plasmin inhibitor) (Alpha-2-PI) (Alpha-2-AP). [Source:Uniprot/SWISSPROT;Acc:P08697] Antigen: Recombinant Protein Epitope Signature Tag (PrEST)....
Biology Products: