4.非常事件(rare events)古海洋学的最重要贡献之一就是以充足的科学证据,详细地论证了地球历史上的重大非常事件的性质及其发生原因.所谓非常事件或稀有事件是指其规模非常巨大,在地球历史上罕见,且发生得突然,几乎在一瞬间就使地球上广大地区的环境大大改变,引起生物界的灾难性的变化,使某些生物种类灭绝.这就是新灾变论. 4. Rare events One of the most important contributions of paleoceanography is to demonstrate in sufficient detail the scientific nature of the nature and the causes of the great events of earth history, Its magnitude, its rare occurrence in Earth’s history, and its sudden occurrence have led to a drastic change in the environment in vast parts of the planet, catastrophic changes in the biological kingdom, the extinction of certain biological species. Catastrophe theory.