Earth’s Oceans Were Slowly Suffocating Millions of Years Before a Devastating Mass Extinction

As today’s oceans lose oxygen, Alaskan rocks trace a similar decline that began millions of years before the end-Triassic mass extinction. Dinosaurs survived the end-Triassic mass extinction 201 million years ago, but roughly 60 percent of Earth’s species did not. New evidence from Virginia Tech geologists suggests that the crisis in the oceans began about [...]