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Geological age likely to be named ‘Chibanian’

The Yomiuri Shimbun

A man points at a stratum that has traces of a reversal of the Earth’s magnetic field in Ichihara, Chiba Prefecture, on Monday.

Jiji Press TOKYO (Jiji Press) — A geological period from 126,000 to 770,000 years ago will highly likely be named “Chibanian,” a group of Japanese researchers said Monday.

According to the team, including researchers from Ibaraki University and the National Institute of Polar Research, an expert committee of the International Union of Geological Sciences has concluded that a stratum in Ichikawa, Chiba Prefecture, is the most suitable place for observing a geological time scale shift 770,000 years ago.

The age is expected to be named Chibanian as early as next year, after the committee’s decision clears three stages of the union’s screening process, the researchers said, adding no geological age has had a Japanese name until now.

The so-called “Chiba section” of the stratum along the Yoro River in the city clearly shows a shift in the Earth’s magnetic field.

In June, the research team submitted to the IUGS a proposal that the age be named Chibanian.

At the committee, the Chiba stratum won support from more than 60 percent of its members in a vote, beating two rival strata both in Italy, the Japanese team said.Speech

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