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In other words, Stinnesbeck thought the rock had been formed slowly, by sedimentation.
也就是說，Stinnesbeck認為巖石是因為緩慢的沉積作用形成的。
There must have been a long time, between the impact below the core and the arrival of the Iridium at the top.
所以巖芯下的碰撞坑和頂部的銥元素層必然間隔了很長一段時間。
Then they noticed something else in the core.
后來他們在巖芯中又有了其它發現。
Traces of what looked like a green clay mineral.
看上去像是某種綠色粘土礦物的痕跡。
Samples were sent for analysis by a technique called x-ray diffraction.
樣本經過了一種叫做X射線衍射技術的分析。
Every mineral has its own unique signature when exposed to x-rays.
在X光下，每種礦物都有其獨特的標記。
The analysis revealed a clay mineral called Glauconite, and Glauconite has one vital characteristic.
分析顯示這是一種叫做海綠石的粘土礦物，而海綠石有一個重要特征。
Glauconite needs many thousands of years to form,
海綠石需要上萬年才能形成，
so it's indicating interruptions in the sedimentation of this limestone,
它表明這些石灰巖的沉積過程曾經中斷過，
so it extends even more the time, the period of time which is needed for the deposition of this limestone.
因此這些石灰巖的沉積形成時間可能更長。
