Image of the Day: 3-Billion-Year-Old Bubbles 

Fossilized gas bubbles, formed from being trapped by microbial biofilms, provide the oldest signature of life in terrestrial hot springs.

May 10, 2017
The Scientist Staff

Gas bubbles found in hot spring deposits in Western Australia, dating back 3.48 billion years  

UNSW

            (See T. Djokic et al., “Earliest signs of life on land preserved in ca. 3.5 Ga hot spring deposits,” Nature Communicationsdoi:10.1038/ncomms15263, 2017.)