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The Mayan calendar used 3114 BC as their reference.
More recently is the radiocarbon date of 1950 AD or before present, BP.
The Greeks consider the first Olympic Games as the beginning or 776 BC.
The Muslims count the Prophet’s departure from Mecca, or the Hegira, as their beginning at AD 662.
The forensic use of carbon-14 measurement does not rely on the slow decay process.
Rodents, for example, can create havoc in a site by moving items from one context to another.
Natural disasters like floods can sweep away top layers of sites to other locations.
Sidebar to the article Applying Carbon-14 Dating to Recent Human Remains by Philip Bulman with Danielle Mc Leod-Henning Standard carbon-14 testing, as used by archaeologists, is based on the natural process of radioactive carbon formation that results from cosmic ray bombardment of nitrogen in the earth's upper atmosphere.
The radioactive carbon is taken from the atmosphere and incorporated into plant tissues by plant photosynthesis.
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Instead, tissue carbon-14 levels are directly compared to levels in a rapidly changing atmosphere.