Radiocarbon dating is possible because

The land bridge, called Beringia, existed during the final period of the last Ice Age, about 15,000 years ago.After crossing Beringia and pushing on to Canada about 10,000 BCE, the Siberian immigrants continued southward through a corridor in the great ice sheets to emerge in what is now the lower 48 states.It seems to have begun about 6000 BC, when the average temperature rose.Melting ice sheets ultimately submerged nearly half of western Europe, creating the bays and inlets along the Atlantic coast that provided a new, rich ecosystem for human subsistence.For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.

He considered that the flattened head was caused by repeated powerful blows (his examination was done pre Darwinism 1859).After the Pleistocene animals became extinct, these ancient Americans diversified to fishing, gathering, and hunting smaller game and marine mammals.From these different adaptations arose the many diverse cultures of pre-Columbian America, eventually developing into great civilizations.SYNONYMS OR RELATED TERMS: Atlantic phase, Atlantic climatic period CATEGORY: chronology DEFINITION: In Europe, a climatic optimum following the Boreal, the warmest period of the Holocene.This period was represented as a maximum of temperature and evidence from beetles suggests it being warmer than average for the interglacial.

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