alluvium period

• 第四纪

alluvium period的用法和样例：

例句

1. Woolly mammoths died out during the late Quaternary period.
   猛犸象在第四纪晚期灭绝了。
2. This type of soil from the quartzy period is called the Villafranchienne terraces.
   这种典型的第四纪地层土壤被叫做维拉弗朗阶土质。