But that was a giant geological event.

但那是一个巨大的地质现象。

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Obviously, it is very difficult to determine the initial age of subduction by using the isotopic age of only one geological event.

显然，如果只想使用任何一种地质事件的年龄来确定碰撞作用的初始作用时间都是很困难的。

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Cooling ages are only restricted within the time range of occurrence of an event of metamorphism-deformation and cannot represent the real time of occurrence of a geological event.

冷却年龄只能限制变质-变形事件发生的时间区间，不能真正代表地质事件的发生时间。

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The Wednesday night blast shook houses 50 miles away and measured as a 2.1-magnitude seismic event, according to the United States Geological Survey.

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The question is one of the most hotly contested in palaeontology and revolves around an apparent gap in the fossil record immediately prior to the K-T boundary - the distinct layer of geological sediments separating the Cretaceous and Tertiary periods, and associated with a massive asteroid impact and global extinction event.

BBC: Closing the 'three metre gap'