Geological age
Middle Ordovician
| item | description | ||||||
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| @id | https://gbank.gsj.jp/ld/resource/geoltime/item/GEOAGE_135020000 | ||||||
| Name | Middle Ordovician | ||||||
| Rank | Epoch | ||||||
| Upper age (Ma) | 458.2 ±0.7 | ||||||
| Lower age (Ma) | 471.3 ±1.4 | ||||||
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| Chronostratigraphic Chart [Chart] |
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