Using the codes 1 to 6 representing the different time periods in the evolutionary time scale shown in Figure 1, indicate the geologic time period that best corresponds to each description.
用地质年代表(表1)中的不同年代的编号1 -6，来代表每个描述所出现的地质年代。
Using the codes 1 to 6 representing the different time periods in the evolutionary time scale shown in Figure 1, indicate the geologic time period that best corresponds to each description.
用地质年代表(表1)中的不同年代的编号1 -6，来代表每个描述所出现的地质年代。
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