段落排序 #19Archaeological Dating Methods
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1The series of strata in an archaeological dig enables an excavator to date recovered objects relatively, if not absolutely.
2However, when archaeologists want to know the absolute date of a site, they can often go beyond simple stratigraphy.
3Historical records, coins, and other date–bearing objects can help — if they exist. But even prehistoric sites contain records written in nature's hand.
4For example, tree ring, Dendrochronology (literally, tree time) dates wooden artefacts by matching their ring patterns to known records, which, in some areas of the world, span several thousand years.
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