I swear, Kentucky never disappoints! There are a LOT of rocks in Kentucky, and in this video specifically the rocks are Ordovician in age which is around 450 million years old. Finding marine ...

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 ...

“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 ...

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 ...

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 ...

"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 ...