Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
可以对树木
年轮和
纹泥季节性
积物进行计数来确定其绝对年龄。
复数）Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
可以对树木年轮和纹泥季节性积物进行计数来确定其绝对年龄。
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.
但纹层厚度变化可能揭示出小冰期积通量减少和上个世纪六十年代
积通量增加。
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