Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.

可以对树木的年轮和纹泥的季节性积物进行计数来确定其对年龄。

The variation of varve thickness may show a decrease of sediment flux during the Little Ice Age, and an increase of sediment flux after 1960s.

但纹层厚度的变化可能揭示出小积通量的减少和上个世纪六十年代之后积通量的增加。