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The date on a coin is an absolute date, as are AD 1492 or 501 in which the proportion of carbon isotopes is counted directly (as contrasted with the indirect Geiger counter method) using an accelerator mass spectrometer.

The method drastically reduces the quantity of datable material required.

The earliest evidence of writing anywhere in the world only goes back about 5000 years.

Paleoanthropologists frequently need chronometric dating systems that can date things that are many thousands or even millions of years older.

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.

In the Southwest, and particularly in CRM, there are several defined types of survey: Remote Sensing: Remote sensing in archeology employs a wide variety of aerial and satellite imaging, as well as radar, sonar and lidar, to build landscape images useful for recognizing archeological materials not visible to ground crews.

Many remote sensing techniques rely on portions of the electromagnetic spectrum, such as infrared, that humans are typically unable to see.

Excavation: Archeologists excavate buried cultural remains to both gather information about past human behavior and to preserve and protect cultural resources from destruction, either from human or natural processes. Discussed below are the three major types of dating used in archeology – relative dating, chronometric dating, and absolute dating – and some of the more popular methods employed in each general category.

Archeological excavations, or “digs,” are conducted using very specific methods and rigorous vertical and horizontal spatial controls. Relative dating in archeology determines the age of cultural material in relation to other cultural material, but does not produce precise dates.

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