of,belonging to,or being the geologic time,system of rocks,and sedimentary deposits of the fifth period of the Paleozoic Era,characterized by the submergence of extensive land areas under shallow seas

• 属于或处于古生代第五世的地质年代的、或该年代的岩石系统的或沉积物的，这一地质时代以大量陆地沉入浅海为特征