Fossil Discoveries Challenge Ideas About Earth’s Start
Rebecca Boyle
January 22, 2018
A
series of fossil finds suggests that life on Earth started earlier than
anyone thought, calling into question a widely held theory of the solar
system’s beginnings.
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Last month, researchers lobbed another salvo in the decades-long
debate about the nature of these forms. They are indeed fossil life, and
they date to 3.465 billion years ago, according to John Valley,
a geochemist at the University of Wisconsin. If Valley and his team are
right, the fossils imply that life diversified remarkably early in the
planet’s tumultuous youth.
The fossils add to a wave of discoveries that point to a new story of
ancient Earth. In the past year, separate teams of researchers have dug
up, pulverized and laser-blasted pieces of rock that may contain life
dating to 3.7, 3.95 and maybe even 4.28 billion years ago. All of these
microfossils — or the chemical evidence associated with them — are hotly
debated. But they all cast doubt on the traditional tale.
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