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2. Microfossils
Microfossils from the Apex Chert, a rock formation in Australia having an age of 3.5 bn yrs
Source: http://www.astronomy.com/magazine/2005/02/seeking-lifes-earthly-cradle
More rigorous tests need to be performed on microfossils before any definitive conclusion is made towards
evidence of early life on earth as mentioned in article below.
Article link: http://phys.org/news/2011-03-overturns-oldest-evidence-life-earth.html
ICY SCIENCE | QTR 1 2014