Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
可以对树木
年
称为纹泥季节性沉积物进行计数来确定其绝对年龄。
冲积层Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
可以对树木年称为纹泥季节性沉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
化可能揭示出小冰期沉积
减少上个世纪六十年代之后沉积增加。
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