为了从时间上定位这些动物走向灭绝的过程，科学家检测了印第安那一片湖泊中的沉积物。

To date the animals' slide to extinction, the scientists examined sediment cores from a lake in Indiana.

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例如，航磁图除可以展示出一个沉积盆地的总体趋势和走向，也可揭露大量的细节部分。

For example, airborne, magnetic maps shows a lot of general trends in a sedimentary basin, and usually a lot of details too.

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通过收集大量钻孔资料，编制并分析了倾向沉积断面图、走向沉积断面图以及砂体等厚图。

Authors draw and analyze depositional trend and strike sections and sandstone isopach maps by collecting a lot of bores.

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