The outcrop "Chiba section" of Tabuchi along the Yoro River is a stratum deposited in the deep sea, which later appeared when the Boso Peninsula was uplifted.
Here, traces of the newest geomagnetic reversal phenomenon that occurred about 77 years ago could be continuously analyzed and observed.By analyzing microfossils and pollen contained in the strata as well as the reversal of the geomagnetic field, research is being conducted on the environment of the sea and land at that time.
Such strata are only in the southern part of the Boso Peninsula and the southern part of Italy. Among them, the Tabuchi stratum has the best conditions for observation, so it was selected as the GSSP (Global Boundary Stratographic Strata and Points) of the geological age boundary. It was done. As a result of being certified by the GSSP, the era starting from the boundary of this stratum (about 77 to 4 years ago, mid-Pleistocene Quaternary) is called "Chibanian" (Latin for "Chiba era"). It was decided to call it.
This is a feat that the Japanese place name was given to the geological age name for the first time.
Guidance facility | Ichihara Tabuchi Geomagnetic Reversal Geomagnetic Reversal Visitor Center |
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Address | 290 Tabuchi, Ichihara City, Chiba Prefecture 0546-1157 |
Phone number / FAX | 0436-96-2755 |
Opening hours | 9:00-16:00 |
Closing days | Every Thursday, New Year holidays (December 12-January 29) |
Access | [For those who go by car] [For those who go by Kominato Railway] |
Website URL |