Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
可以
树木
轮和被称为纹泥季节性沉积物进行计数来确定其绝
。
融积层；融积雪（varve复数）Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
可以树木轮和被称为纹泥季节性沉积物进行计数来确定其绝。
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
冰期沉积通量减少和上个世纪六十代之后沉积通量增加。
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