However, there are many postcards that were never mailed or that a part of the post mark is illegible or soiled.
Here are some general guidelines to help determine the age range of your post card.
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Both laboratories use standard, best-practice procedures on state-of-the-art equipment.
The model K-Ar ages for each of the samples ranged from 405.1±10 Ma to 2574.2±73 Ma.
The "age" or "date" is calculated from the amount of the daughter isotope produced by radioactive decay of the parent isotope.