The sediments contained fossil pollen. Each grain had a telltale carbon atom signature, allowing them to put the samples in chronological order.
沉积物内含有孢粉化石，而每一粒孢粉都含有能告诉我们答案的碳原子标记，容许我们按照地质时间的顺序分析样品。
The sediments contained fossil pollen. Each grain had a telltale carbon atom signature, allowing them to put the samples in chronological order.
沉积物内含有孢粉化石，而每一粒孢粉都含有能告诉我们答案的碳原子标记，容许我们按照地质时间的顺序分析样品。
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