In June of 1980 Luis W.Alvarez and his cot- leagues introduced a theory for the cause of the extinction that occurred between the Cretaceous and Tertiary periods.

• 1980年6月，路易斯·W·阿尔瓦雷茨和他的同事们，提出了一个关于白垩纪与三叠纪交界时那次大灭绝原因的理论。