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| 指準化石 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 標準化石 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
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| 示準化石 (fossil which suggests a date of the formation of a rock stratum) | |||
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| 指準化石 River and Water Resources Glossary (Infrastructure Development Institute Japan) ; 標準化石 River and Water Resources Glossary (Infrastructure Development Institute Japan) | |||
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| 示準化石 (fossil which suggests a date of the formation of a rock stratum) | |||
