silurian

例句:

• THE RETZIELLIDAE ( SILURIAN RIBBED IMPUNCTATE ATHYRIDIDINE BRACHIOPODS )
  论志留纪的小莱采贝类——具壳线、无疹无窗贝族(腕足动物 )
  
• See Ordovician-Silurian extinction events.
  来自BBC
• The contact relationship between Silurian and Devonian is parallel unconformity.
  泥盆系与志留系之间为平行不整合接触.
  
• Porphyry mineralization, occurred in the Silurian Period, finally formed ore bodies.
  晚期矿化发生于志留纪, 使矿床最终形成.
  
• It follows the Cambrian Period and is followed by the Silurian Period.
  来自BBC
• In the oceans, primitive sharks became more numerous than in the Silurian and the late Ordovician.
  来自BBC