Boswell Wing

Billion-year-old lake deposit yields clues to Earth’s ancient biosphere

Published: 18Jul2018

A sample of ancient oxygen, teased out of a 1.4 billion-year-old evaporative lake deposit in Ontario, provides fresh evidence of what the Earth’s atmosphere and biosphere were like during the...

Mining ancient ores for clues to early life

Published: 10Dec2012

An analysis of sulfide ore deposits from one of the world’s richest base-metal mines confirms that oxygen levels were extremely low on Earth 2.7 billion years ago, but also shows that microbes were...