Last Updated
：2025/11/20
Ordovician
Adjective
Japanese Meaning
オルドビス紀の: 古生代に属する地質時代の一つで、大体4億8800万年前から4億4300万年前までの期間を指し、下部、中部、上部のエポックに分かれる。
（ comparative ）
（ superlative ）
Quizzes for review
(geology) Of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 488 to 443 million years ago.
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Ordovician
Fossilized brachiopods in the Ordovician limestone revealed new insights into ancient marine ecosystems.
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Fossilized brachiopods in the Ordovician limestone revealed new insights into ancient marine ecosystems.
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