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the Devonian period
The Devonian period was a very important time in the history of the Earth.
Kyūjitai form of 三畳紀 (“the Triassic period”)
The Triassic period is one of the geological ages, referring to the period from about 252 million years ago to about 200 million years ago.
(obsolete) Synonym of オルドビス紀
The Ordovician, an era name used in paleontology, is now called the Ordovician.
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