image: A group of geologists that includes co-authors Justin Strauss and Tiffani Fraser examine Silurian strata of the Tetlit Formation exposed on the Peel River, Yukon Territory in 2015.
Credit: Erik Sperling, Stanford University
Thallium isotopes show O2 levels rose and fell at the ocean floor long after marine animals appeared and diversified half billion years ago, according to study of ancient marine sediments exposed by river cuts in Canada's Yukon
Journal
Science Advances
Method of Research
Observational study
Subject of Research
Not applicable
Article Title
Dynamic deep marine oxygenation during the early and middle Paleozoic
Article Publication Date
3-Sep-2025
COI Statement
The authors declare they have no competing interest.