Last Updated
：2025/12/05
lower boundary
Noun
Japanese Meaning
[地質学] 指定された地質年代に含まれる最も古い時刻、すなわちその時代の始まりに相当する境界 / [言語学] 指定された期間に含まれる最も最近の時刻、すなわちその期間の終わりに相当する境界
（ plural ）
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(geology) The most ancient time encompassed by a given geological period. / (linguistics) The most recent time encompassed by a given period of time.
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lower boundary
Geologists determined the lower boundary of the period by analyzing fossil assemblages.
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Geologists determined the lower boundary of the period by analyzing fossil assemblages.
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