The Anasazi Heritage Center has given each specimen several unique codes, including cdept, to facilitate management of their DAP collections.This value specifies the tool department to which each record belongs.
This value denotes the entry's corresponding Smithsonian site number.Specific changes in its amino acid structure (racemization or epimerization) which occur at a slow, relatively uniform rate, are measured after the organism's death.The basis for the technique is the fact that almost all amino acids change from optically active to optically passive compounds (racemize) over a period of time.Length, diameter, and the species of sampled timber for tree-ring data are provided, as well as an approximation of the structural element from which they were taken.Since the majority of dateable material has been derived from botanical resources, treatment of the methodological procedures used in their recovery can be found in the environmental studies mid-level research design (Petersen, Clay et al. Discussion of research design as it relates to archaeomagnetic dating can be found in Hathaway (1988) and Hathaway and Eighmy (1984).These values range from low to high, but a recode of this variable also contains a description of their relative utility.
Archaeomagnetic entries also include an indication as to whether the sample had yielded an interpretable date, was discarded, recalibrated, or was related to dendrochronological samples.
Aspartic acid is the compound most often used because it has a of 15,000-20,000 years and allows dates from 5,000-100,000 years to be calculated.
However, racemization is very much affected by environmental factors such as temperature change.
The Anasazi Heritage Center has given each specimen several unique codes, including caccnid, to facilitate management of their DAP collections.
The first digits of this value indicate the year that it was accessioned.
SYNONYMS OR RELATED TERMS: chronometric dating; absolute dates; absolute chronology; absolute age determination (antonym: relative dating)CATEGORY: chronology; technique DEFINITION: The determination of age with reference to a specific time scale, such as a fixed calendrical system or in years before present (B.