For example, in our sample we used the preponderance of 78 rpm records as an indicator of relative age of a junkyard. Seriation, too, may be skewed for one reason or another.Site stratigraphies may be disturbed by earthquakes, or when human or animal excavation unrelated to the occupation disturbs the sediment. ![]() Thermoluminescence dates may be thrown off by incidental heating long after the occupation has ended.Radiocarbon samples are easily contaminated by rodent burrowing or during collection.
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