Eifelian
(rare) The quality of being a pond.
One who impregnates.
(geology, paleontology) A subdivision of the Devonian period.
Any of several reversals in the polarity of the Earth's magnetic field (such that a compass points South) that have happened over geologic time.
古生物学者たちは、その地域のデボン紀中期に堆積した地層で、多様な腕足類やサンゴの群集を発見した。
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