Dating ancient artifacts
"The dates could actually be older," Goodyear says.
1940-1945: Increased demand for aluminum foil packaging (Sacharow 1978: 112).
A new sealed double tube combustion method was developed at Lawrence Livermore National Laboratory (LLNL) to extract carbon from modern steels and ancient iron artifacts.
Iron samples were chemically pretreated with 10% nitric acid, vacuum sealed in 6 mm quartz tubes with Cu O, vacuum sealed again inside 9 mm quartz tubes, and combusted at 1000 °C for a minimum of 10 hr.
Accurate dating of ancient rings is more difficult than dating coins, which often can be attributed to an exact year, and sometimes even the city in which it was minted.
Dating rings must take into account the shape and style, the inscription or symbols contained on it, and the environment in which it was found. So see below how to date antique jewelry and antiquities.
Search for dating ancient artifacts:
The findings are significant because they suggest that humans inhabited North America well before the last ice age more than 20,000 years ago, a potentially explosive revelation in American archaeology.