from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites
双语例句
It contains the deeply dissected Bungle Bungle Range composed of Devonian-age quartz sandstone eroded over a period of 20? 这些成行成列的塔形或圆锥形的山峦，由泥盆纪时代的石英砂构成。
In Puan-Qianchang of Guizhou Province, the middle and late Devonian sedimentary rocks were mainly developed during the Devonian Period. 贵州普安铅厂泥盆纪主要发育中晚泥盆世的地层。
