Last Updated
：2025/12/07
新第三紀
Hiragana
しんだいさんき
Proper noun
Japanese Meaning
地質時代区分の一つで、中生代と第四紀の間に位置する新生代の時代区分。「新第三紀」はかつて用いられた区分で、現在の国際層序では主に中新世・鮮新世などに相当する。
Easy Japanese Meaning
地球のなかで きんにくのじだいより あとの あたらしい じだいの なまえ
Sense（1）
the Neogene period
（ canonical ）
（ romanization ）
（ hiragana ）
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新第三紀
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The Neogene period is a part of the geological era, which lasted from about 23 million years ago to about 2.6 million years ago.
The Neogene period is a part of the geological era, which lasted from about 23 million years ago to about 2.6 million years ago.
See correct answer
新第三紀は地質時代の一部で、約2300万年前から約260万年前まで続いた。
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