Glossary of dating terms
the most commonly used calendar system in the world today.
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.
Calibrated relative methods could be considered to be somewhere between ordinary relative methods and radiometric methods in terms of their ability to produce dates that closely approximate the actual date of a sample.
Amino acid racemization and paleomagnetic dating are generally considered to be either chronometric or calibrated relative methods.
Artifacts are usually relatively portable objects such as projectile points, ceramic pots, and relative dating of early human sites by association with index fossils uncovered in the same strata as human evidence.
The assumption is that both the people and the species that is now an index fossil must have lived at about the same of a relative dating method that measures somewhat irregular occurring natural phenomena that have been cross-dated with at least one chronometric technique so that the dates are somewhat comparable from sites in one region to another.
Pollen particles are usually nearly invisible, except in large concentrations, due to their extremely small size.
They can survive for hundreds of thousands of years in silty, anaerobic soils, such as mud sediments at the bottom of a lake.
Aspartic acid in organic samples is commonly used for this dating technique.things that are intentionally made according to a cultural pattern or inadvertently modified as a result of culturally patterned behavior.The advantage of this technique over the conventional radiocarbon method is that it requires a far smaller sample size and can potentially provide dates going back to around 100,000 B. At present, however, AMS dates generally are for events less than organic molecules that are building blocks of proteins.There are at least 20 different kinds of amino acids in living things.Since the rate of hydration varies between samples from different volcanic sources, this technique could arguably be considered relative rather than chronometric.a comparatively new radiometric dating technique similar to thermal luminescence.OSL is based on the fact that minerals in sediment grains are affected by prolonged exposure to light.