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Plants are not the only organism that can process Carbon-14 from the air.

Plankton absorbs, Carbon-14 from the ocean much like terrestrial plants absorb Carbon-14 from the air.

The Muslims count the Prophet’s departure from Mecca, or the Hegira, as their beginning at AD 662.

The Mayan calendar used 3114 BC as their reference.

Radiocarbon is produced in the upper atmosphere after Nitrogen-14 isotopes have been impacted by cosmic radiation.

Radiocarbon is then taken in by plants through photosynthesis, and these plants in turn are consumed by all the organisms on the planet.

For example, Christian time counts the birth of Christ as the beginning, AD 1 (Anno Domini); everything that occurred before Christ is counted backwards from AD as BC (Before Christ).

The Greeks consider the first Olympic Games as the beginning or 776 BC.

In a stratigraphical context objects closer to the surface are more recent in time relative to items deeper in the ground.

AMS dating lab Beta Analytic is inviting members of the Society of American Archaeology (SAA) to join the raffle at Booth #300 during the 84th SAA Annual Meeting to be held at the Albuquerque Convention Center in Albuquerque, New Mexico, from April 10-14, 2019.

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In 11,460 years, half of the 50% will remain, or 25%, and so on.

Limitations and calibration: When Libby was first determining radiocarbon dates, he found that before 1000 BC his dates were earlier than calendar dates.

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Natural disasters like floods can sweep away top layers of sites to other locations.

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