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If during K-Ar analyses these detrital grains are not recognized and eliminated then they can cause the measured ages to be systematically too old.

Recent advances in K-Ar geochronology, specifically the Ar dating has been a major factor in this success.

It does not, however, allow one to independently assign an accurate estimation of the age of an object as expressed in years.

The most common relative dating method is stratigraphy.

This grain-discrete method now permits precise and accurate ages to be measured on single grains and, thus, contaminating grains can be eliminated.

) it is possible to define, minimally, a four-part subdivision.

Relative dating methods allow one to determine if an object is earlier than, later than, or contemporary with some other object.

During the latter half of this century anthropological surveys in East Africa have made significant contributions to understanding how the human species has evolved.

In the past two decades, particularly, discoveries of our fossil ancestors have been made in unprecedented numbers and diversity.

Radioactive carbon has a half-life of approximately 5,730 years which means that every 5,730 years, half of the carbon-14 will have decayed.

This number is usually written as a range, with plus or minus 40 years (1 standard deviation of error) and the theoretical absolute limit of this method is 80,000 years ago, although the practical limit is close to 50,000 years ago.

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