Galen Halverson

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...

Origins of photosynthesis in plants dated to 1.25 billion years ago

Published: 20Dec2017

The world’s oldest algae fossils are a billion years old, according to a new analysis by earth scientists at McGill University. Based on this finding, the researchers also estimate that the basis...

The making of Antarctica

Published: 31Jan2017

One of the big mysteries in the scientific world is how the ice sheets of Antarctica formed so rapidly about 34 million years ago, at the boundary between the Eocene and Oligocene epochs....