silurian

柯林斯詞典

Silurian /sa??l??r??n/

• 1. ADJ of, denoting, or formed in the third period of the Palaeozoic era, between the Ordovician and Devonian periods, which lasted for 25 million years, during which fishes first appeared 志留紀(jì)的; 奧陶紀(jì)與泥盆紀(jì)之間，持續(xù)了2500萬年，此間首次出現(xiàn)魚類

• 2. N the Silurian period or rock system 志留紀(jì)

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