Stratotype Point Base of Chibanian
http://resource.geosciml.org/classifier/ics/ischart/BaseChibanianSP
| ratified GSSP |  |
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| boundary level | GSSP is 1 m below base Brunhes Chron in type section; base Brunhes Chron at 773 ka provided the numeric age in prior chart versions | |||||||
| change note | https://stratigraphy.org/icschart/ChangeLog2012-2013-2014-2015-2016-2017-2018-2019-2020.txt | |||||||
| comment | Chiba, Japan | |||||||
| correlation event | Byk-E tephra; 1.1 m below directional midpoint of Brunhes–Matuyama magnetic reversal (base of Chron 1n) | |||||||
| status | ratified by IUGS (15-01-2020) | |||||||
| type |
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| represents boundary |
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