ordovician 

  1. 形容詞
奧陶紀的, 奧陶系的

    
                        
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例句

                

                    
    
                                                    
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                                Late in the Ordovician sea levels dropped.                            
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  2. 
                                Wanna know how the Ordovician Period ended?                            
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                                These deposits occurred during the Ordovician period.                            
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                                The conglomerate is estimated to be Ordovician in age.                            
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                                During the ensuing Ordovician period the seas deepened.                            
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