Earth has a new geologic age: The Chibanian

A photo shows the cliffside in Japan's Chiba prefecture that's part of a line of sediment that recorded the geologic history of the planet between 770,000 and 126,000 years ago.
A photo shows the cliffside in Japan's Chiba prefecture that's part of a line of sediment that recorded the geologic history of the planet between 770,000 and 126,000 years ago. (Image credit: Kyodo/Newscom)

Earth has a new age: the Chibanian geologic time interval, which took place from 770,000 to 126,000 years ago, thanks to a layer of sediment found on a riverside cliff in southern Japan.

The Chibanian age was named after Chiba, the Japanese prefecture where the sediment was found, and was recently ratified by the International Union of Geological Sciences. That period is important because it included the most recent reversal of Earth's magnetic field, an article in Eos said. At various points in our planet's history, Earth's magnetic north and south poles have swapped locations. When that flip happens, it leaves a mark in rocks around the planet. The cliffside sediment in Chiba, Japan, may offer a richer record of that reversal than any other site on Earth.

Studying how the polarity reversal happened might help us understand what's going on today. Our planet's magnetic poles have wandered in recent years, and scientists don't fully understand why.

Originally published on Live Science.

Rafi Letzter
Staff Writer
Rafi joined Live Science in 2017. He has a bachelor's degree in journalism from Northwestern University’s Medill School of journalism. You can find his past science reporting at Inverse, Business Insider and Popular Science, and his past photojournalism on the Flash90 wire service and in the pages of The Courier Post of southern New Jersey.