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Carbon film fossils are usually black, dark brown or light brown in color, depending on the type of rock they are pressed upon.Unlike trace fossils, molds and casts, which form a three-dimensional shape of the object or organism, carbon film fossils are two-dimensional, like a drawing.

A carbon film is made when the oxygen, hydrogen and nitrogen of the organism disappear, leaving a thin layer of carbon.

Radiocarbon dating is especially good for determining the age of sites occupied within the last 26,000 years or so (but has the potential for sites over 50,000), can be used on carbon-based materials (organic or inorganic), and can be accurate to within ±30-50 years.

Probably the most important factor to consider when using radiocarbon dating is if external factors, whether through artificial contamination, animal disturbance, or human negligence, contributed to any errors in the determinations.

The approach was a sensation when it was introduced.

The chemist who developed carbon dating, Willard Libby, won the Nobel Prize for his work.




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