Category:ja:Geological periods
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Japanese terms related to geological periods.
NOTE: This is a "related-to" category. It should contain terms directly related to geological periods. Please do not include terms that merely have a tangential connection to geological periods. Be aware that terms for types or instances of this topic often go in a separate category.
The following label generates this category: geological periodedit. To generate this category using this label, use {{lb|ja|label}}.