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气候恶化是地质历史发展中的重要事件,近年倍受地学界所关注.人们一般通过地层物质组成及一些特殊地球化学元素的变化来证实这类事件的存在.从动物年龄分布角度分析气候恶化事件尚未见报道.本文以甘肃武都龙家沟三趾马动物群和陕西府谷老高川庙梁三趾马动物群数千件化石为基础,从动物年龄分布论证了中新世晚期气候恶化事件的存在及影响范围.本文涉及动物群的时代为中新世保德期庙梁亚期,古地磁年龄约5.3Ma.
Climatic deterioration is an important event in the development of geological history, which has attracted much attention from the geosciences in recent years.It is generally confirmed by the changes of formation composition and some special geochemical elements that climate deterioration events are analyzed from the perspective of animal age distribution It has not been reported yet.This paper based on thousands of fossils from the Longdi ditch Tri-otus fauna in Wudu, Gansu Province and Liang San-Dian temple fauna in Laogao Chuanmiao, Fugu, Shaanxi Province, and demonstrates the late Miocene climatic deterioration events from animal age distribution Of the existence and scope of influence.This paper deals with the fauna of the fauna as the Miocene Baode period temple Liang Asia period, paleomagnetic age about 5.3Ma.