Researchers quantify toxic ocean conditions during major extinction 93.9 million years ago
Monday, October 28, 2013 - 17:01
in Earth & Climate
Oxygen in the atmosphere and ocean rose dramatically about 600 million years ago, coinciding with the first proliferation of animal life. Since then, numerous short lived biotic events—typically marked by significant climatic perturbations—took place when oxygen concentrations in the ocean dipped episodically.