Llandovery
simple past tense of do down
In a shy manner.
Of or relating to neuroarthropathy.
(geology) A geological epoch within the Silurian period from about 443 to 428 million years ago; marked by the appearance of the trilobites.
古生物学者たちは、シルル紀前期（約4億4,300万〜4億2,800万年前）の堆積物から新種の腕足類を発見し、初期シルル紀の海洋生物に関する理解を一変させた。
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