Among the most useful chronometric dating techniques are radiocarbon dating, potassium argon dating, and thermoluminescence dating.
Dendrochronology, the relationship of dated ancient trees with live trees has no SYNONYMS OR RELATED TERMS: collagen dating CATEGORY: technique DEFINITION: Collagen is a protein abundant in living bone, which contains about 4% nitrogen.
It is fairly reliable for deep-sea sediments as the temperature is generally more stable.
SYNONYMS OR RELATED TERMS: archaeomagnetic intensity dating, archaeomagnetism, palaeointensity dating, archaeomagnetic age determination CATEGORY: technique DEFINITION: A chronometric method used to date objects containing magnetic materials -- especially for buried undisturbed features such as pottery kilns, earthen fireplaces, and brick walls -- which can be compared to known schedules of past magnetic alignments within a region and fluctuations in the earth's magnetic field.
The technique is based on the principle that cations of certain elements are more soluble than others; they leach out of rock varnish more rapidly than the less soluble elements, and their concentration decreases with time.
A cation is an ion carrying a positive charge which moves toward the negative electrode/cathode during electrolysis.
Therefore, pottery which is baked in effect fossilizes" the Earth's magnetic field as it was the moment of their last cooling (their archaeomagnetism or remanent magnetism).
In areas where variations in the Earth's magnetic field are known it is possible to date a pottery sample on a curve.
Still, the most commonly used is SYNONYMS OR RELATED TERMS: radiocarbon dating CATEGORY: technique DEFINITION: The occurrence of natural radioactive carbon in the atmosphere allows archaeologists the ability to date organic materials as old as 50,000 years.SYNONYMS OR RELATED TERMS: amino-acid dating; aminostratigraphy; amino-acid racemization, amino acid racemization CATEGORY: technique DEFINITION: A method of absolute (chronometric) dating which is hoped to fill the gap between radiocarbon dates and potassium-argon dates.It is used for human and animal bone and other organic material.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.