化石记录（fossil record）是地史时期全部生物中被保存下来和可以识别的化石材料的统称。
化石记录表明，在中生代末期，许多动植物突然灭绝。
The fossil record suggests that there was an abrupt extinction of many plants and animals at the end of the Mesozoic era.
为什么化石记录没有记录动物进化过程中的一系列进化变化？
Why does the fossil record not document the series of evolutionary changes during the evolution of animals?
然而，对于更古老的进化序列，估测则是基于化石记录的部分。
However, for older sequence of evolutionary development, estimates based on parts in the fossil record.
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