Tree rings and seasonal sedimentary deposits called varves can be counted to determine absolute age.
可以对树木的年轮和被称为纹泥的季节性沉积物进行计数来确定其绝对年龄。
原声例句
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Then we transitioned from that crater floor into the sedimentary deposits and now we're here in sandstones, conglomerates, mud stones, the kinds of rocks that are deposited by flowing water.
Superficial deposits refer to geological deposits typically of less than 2.6 million years old. These recent unconsolidated sediments may include stream channel and floodplain deposits, beach sands, talus gravels and glacial drift and moraine. All pre-quaternary deposits are referred to as bedrock.