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14c and carbon dating

When it comes to dating archaeological samples, several timescale problems arise.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 Muslims count the Prophet’s departure from Mecca, or the Hegira, as their beginning at AD 662.

Shellfish remains are common in coastal and estuarine archaeological sites, but dating these samples require a correction for the “reservoir effect” a process whereby "old carbon" is recycled and incorporated into marine life especially shellfish inflating their actual age in some cases several centuries.

In recognition of this problem archaeologists have developed regional reservoir correction rates based on ocean bottom topography, water temperature, coastline shape and paired samples of terrestrial and marine objects found together in an archaeological feature such as a hearth.

In fact, levels of Carbon-14 have varied in the atmosphere through time.

One good example would be the elevated levels of Carbon-14 in our atmosphere since WWII as a result of atomic bombs testing.

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There are two techniques for dating in archaeological sites: relative and absolute dating.

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