There are at least 20 different kinds of amino acids in living things.
Proteins are composed of different combinations of amino acids assembled in chain-like molecules.
It is based on the older Julian calendar of the late Roman Empire but more accurately corresponds to the solar year of 365.2422 days. This is inaccurate by approximately 11 minutes a year.
OSL is based on the fact that minerals in sediment grains are affected by prolonged exposure to light.
Specifically, light causes electrons of the mineral atoms to be progressively dislodged. So far, the OSL technique has been used to date silty or sandy water deposited sediments that are 1/2 million years old or experimental dating technique based on the fact that organic carbon in soil humus and charcoal progressively convert to oxidizable carbon over time.
The ratios of these two forms of carbon vary directly with the age of the material.
This technique requires an inexpensive chemical analysis procedure.
The discovery of such a fossil in an archaeological site is circumstantial evidence of the approximate time period that it was occupied.