Derryvree’s Arctic Sediments
Dates this remote are produced by scientific measurements with margins of uncertainty, not by calendars. Radiocarbon ages must be calibrated against changing atmospheric carbon levels; even then, the results are ranges, sometimes broad ones. Sediments can be displaced by ice, bones can be redeposited within caves, and material from different episodes can become mixed. A fossil collection labelled “Ice Age” is not automatically a single living community or a single moment in time.