短語(yǔ)詞組短語(yǔ)ordovician silurian 奧陶紀(jì)志留紀(jì)Silurian Pediod 志留紀(jì)Silurian corals 葛治洲the silurian 志留紀(jì)pre silurian 志留紀(jì)前的Silurian sandstone 志留系砂巖Silurian Carboniferous 志留系latest Silurian 頂志留統(tǒng)silurian system 志留系silurian period [地]志留紀(jì) 返回 silurian