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Tree rings, which record the amount of atmospheric carbon in their rings, are used to calibrate radiocarbon dates. However, a major disadvantage with using BP is--the present year, of course, changes every twelve months.

Scholars use the science of dendrochronology, which measures annular rings and matches them to known carbon fluctuations. Since the BP designation was originally associated with radiocarbon dating, archaeologists chose the year 1950 as a reference point for 'the present'.

The Dreamtime is at once the ancient time of creation and the present day reality of Dreaming.

The exact timing of the arrival of the ancestors of Aboriginal people has been a matter of dispute among archaeologists.

Thus, the ratio of argon-40 and potassium-40 and radiogenic calcium-40 to potassium-40 in a mineral or rock is a measure of the age of the sample.

Australian Aborigines are the main indigenous people of Australia.

Their ancestors probably arrived in Australia over 50,000 years ago, although this figure remains in dispute.

P.), when placed after a number (as in 2500 BP), means "years Before the Present".

Archaeologists generally use this abbreviation to refer to dates that were obtained through the radiocarbon dating technology, although not exclusively; it was certainly made necessary by the quirks of the radiocarbon methodology.

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