Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
可以对树木
年轮和被称为纹泥季节性沉
物进行计数来确定其绝对年龄。
；年雪（varve复数）Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
可以对树木年轮和被称为纹泥季节性沉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.
但纹厚度变化可能揭示出小冰期沉通量减少和上个世纪六十年代之后沉通量增加。
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