Life Began on Land 300 Million Years Earlier Than Previously Believed
Life took hold on land at least as early as 3.2 billion years ago, suggests a study by scientists from Berlin, Potsdam and Jena (Germany).
In a layer that has been dated at 3.22 billion years old, tiny grains of the iron sulfide mineral pyrite were discovered that show telltale signs of microbial activity. These signs are recorded both in trace element distributions as well as in the ratio between the sulfur isotopes 34S and 32S in the pyrite.
The composition of the rock, the shape of the crystals, and the layering visible in the field all indicate that the studied rock sequence was derived from an ancient soil profile; this so-called paleosol developed on a river flood plain 3.22 billion years ago. Field data collected during this study imply that a braided river system transported the sediment containing the iron sulfide crystals. It is interpreted that microbes living in the soil, at a level that was continually shifting between wet and dry conditions, subsequently produced the rim overgrowths on the pyrite crystals.
Based on this evidence, the scientists conclude in their publication in the journal “Geology” that they found evidence for biological activity on land at this very early date. Their research pushes back the date for the oldest evidence of life on land to some 300 million years earlier than previously documented.
GFZ German Research Centre for Geosciences
Source: http://www.ineffableisland.com/2016/11/life-began-on-land-300-million-years.html
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Science can “suggest” away till its hearts content but what can they prove?
This study sure doesn’t prove when life began.
At least the scientists were honest unlike this BIN headline!