from 425 million to 405 million years ago; first air-breathing animals
Silurian的用法和樣例:
例句
用作形容詞 (adj.)
Ancient plant in the early Paleozoic marine mainly to the late Silurian Period, the original plants begin boarding land. 古植物在古生代早期以海生藻類為主,至志留紀末期,原始植物開始登上陸地。