The Times West Virginian

Community News Network

January 1, 2013

Fossils may date from 3.5 billion years ago

Scientists analyzing Australian rocks have discovered traces of bacteria that lived a record-breaking 3.49 billion years ago, a mere billion years after Earth formed.

If the find withstands the scrutiny that inevitably faces claims of fossils this old, it could move scientists one step closer to understanding the first chapters of life on Earth. The discovery could also spur the search for ancient life on other planets.

These traces of bacteria "are the oldest fossils ever described. Those are our oldest ancestors," said Nora Noffke, a biogeochemist at Old Dominion University in Norfolk who was part of the group that made the find and presented it last month at a meeting of the Geological Society of America.

Unlike dinosaur bones, the newly identified fossils are not petrified body parts. They're textures on the surfaces of sandstone thought to be sculpted by once-living organisms. Today, similar patterns decorate parts of Tunisia's coast, created by thick mats of bacteria that trap and glue together sand particles. Sand that is stuck to the land beneath the mats and thus protected from erosion can over time turn into rock that can long outlast the living organisms above it.

Finding the earliest remnants of this process required a long, hard look at some of the planet's oldest rocks, located in Western Australia's Pilbara region. This ancient landscape was once shoreline. Rocks made from sediment piled up billions of years ago are now exposed and available for examination. Relatively pristine in condition, such outcrops, along with others in South Africa, have long been a popular place to look for traces of life from the Archean eon, which ended 2.5 billion years ago.

There are older rocks on Earth, said Maud Walsh, a biogeologist at Louisiana State University in Baton Rouge. "But these are the best-preserved sedimentary rocks we know of, the ones most likely to preserve the really tiny structures and chemicals that provide evidence for life." Last year, another team of researchers published the discovery of microscopic fossils in Pilbara's Strelley Pool Formation, about 3.4 billion years old.

Text Only
Community News Network
  • Smartphone kill switches are coming

    Smartphones need kill switches. It's a relatively easy solution to the pricey (and irritating) problem of smartphone theft. But who would have thought that the big carriers would team up with Apple, Google, Microsoft, Nokia, Samsung and lots of other manufacturers to voluntarily begin adding the technology by July 2015? The cooperative spirit! It makes so much sense!

    April 18, 2014

  • Why do wolves howl?

    Of all the myths that dog the wolf, none is more widely accepted than the idea that wolves howl at the moon. Images of wolves with their heads upturned, singing at the night sky, are as unquestioned as a goldfish's three-second memory or a dog's color-blindness (both also myths).

    April 18, 2014

  • Biggest student loan profits come from grad students

    This week, the Congressional Budget Office projected that the federal government would earn roughly $127 billion from student lending during the next 10 years.

    April 18, 2014

  • quake.jpg Pennsylvania won’t take action following Ohio ruling on quakes, fracking

    Pennsylvania officials plan no action despite new Ohio rules on drilling that affect a seismically active area near the state line.

    April 18, 2014 1 Photo

  • VIDEO: Boston bomb scare defendant appears in court

    The man accused of carrying a backpack containing a rice cooker near the Boston Marathon finish line on the anniversary of the bombings was arraigned Wednesday. He's being held on $100,000 bail.

    April 17, 2014

  • Consumer spending on health care jumps as Affordable Care Act takes hold

    Nancy Beigel has known since September that she would need hernia surgery. She couldn't afford it on her $11,000 yearly income until she became eligible for Medicaid in January through President Barack Obama's signature health care law.

    April 17, 2014

  • The case for separate beds

    The other night I slept on a twin bed in the guest room of the house I share with my husband and our two kids.
    It was the best night's sleep I've had in years.

    April 17, 2014

  • Raw oysters spike U.S. rise in bacterial infections, CDC reports

    Raw oysters, so good with hot sauce, increasingly can carry something even more unsettling to the stomach: A bacteria linked to vomiting, diarrhea and pain.

    April 17, 2014

  • To sleep well, you may need to adjust what you eat and when

    Sleep.  Oh, to sleep.  A good night's sleep is often a struggle for more than half of American adults.  And for occasional insomnia, there are good reasons to avoid using medications, whether over-the-counter or prescription.

    April 16, 2014

  • Doctors to rate cost effectiveness of expensive cancer drugs

    The world's largest organization of cancer doctors plans to rate the cost effectiveness of expensive oncology drugs, and will urge physicians to use the ratings to discuss the costs with their patients.

    April 16, 2014

House Ads
Featured Ads