During the Silurian period, which succeeded the Ordovician, these survivors repopulated the oceans. Mitchell has focused much of his work on a group of filter feeders that the extinction hit ...

Toxic metals unleashed by depleted oxygen in the oceans may have helped trigger ... The series of extinctions that occurred during the Ordovician and Silurian periods between 445 and 415 million ...

But as the millennia passed, by the Ordovician Period ... which formed nearly 2 billion years ago when two ancient oceans closed. And as I mentioned before, the Rift Valley in eastern ...

Terms of Service and Privacy Policy. Earth’s oceans may not have always been as brilliantly blue as they are today. In fact, there may have been a time when they ...

Earth's oceans, known for their deep blue hue, could one day undergo color shifts, say scientists. A report based on a study published in Nature suggests that our oceans have not always been blue ...

Here’s how it works. The reason Earth's oceans may have looked different in the ancient past is to do with their chemistry and the evolution of photosynthesis. As a geology undergraduate student ...

This story was originally published by Grist. Sign up for Grist’s weekly newsletter here. Earth’s oceans caught a fever in March 2023 that has yet to break. Since then, the bathwater-like ...

“Shark-like scales from the Late Ordovician have been found ... including many lineages of fish that once swam the oceans. This allowed sharks to dominate, giving rise to a whole variety of shapes and ...

"Our Oceans" is a five-episode documentary series set to premiere on Netflix on Nov. 20 Kelli Bender is the Pets Editor at PEOPLE. She has been working at PEOPLE since 2013. Her work has ...

Get Instant Summarized Text (Gist) Earth's oceans, once green due to high levels of oxidized iron and anaerobic photosynthesis, could change color again. Early photosynthetic organisms used iron ...