UW News

Matt Koehler

July 9, 2018

Oxygen levels on early Earth rose and fell several times before the successful Great Oxidation Event

The Jeerinah Formation in Western Australia, where a UW-led team found a nitrogen isotope "excursion." “Nitrogen isotopes tell a story about oxygenation of the surface ocean, and this oxygenation spans hundreds of kilometers across a marine basin and lasts for somewhere less than 50 million years," said lead author Matt Koehler.

Earth’s oxygen levels rose and fell more than once hundreds of millions of years before the planetwide success of the Great Oxidation Event about 2.4 billion years ago, new research from the University of Washington shows.