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Chemical techniques relative dating

With the cumulative experience of centuries of paleontological research, the chronology of many fossil species are well established in context of both geologic time and distribution.

Biostratigraphy is the science of correlation of sedimentary units base on the identifiable fossils they contain.

The development of Atomic Absorption Mass Spectrometry in recent years, a technique that allows one to count the individual atoms of 14C remaining in a sample instead of measuring the radioactive decay of the 14C, has considerably broadened the applicability of radiocarbon dating because it is now possible to date much smaller samples, as small as a grain of rice, for example.

Dendrochronology is another archaeological dating technique in which tree rings are used to date pieces of wood to the exact year in which they were cut down.

The majority of chronometric dating methods are radiometric, which means they involve measuring the radioactive decay of a certain chemical isotope.

They are called chronometric because they allow one to make a very accurate scientific estimate of the date of an object as expressed in years.

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

Geochronology is the science of dating and determining the time sequence of events in the history of the Earth.

They do not, however, give "absolute" dates because they merely provide a statistical probability that a given date falls within a certain range of age expressed in years.

Chronometric methods include radiocarbon, potassium-argon, fission-track, and thermoluminescence.

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.

Because the pool of radioactive carbon in the atmosphere (a result of bombardment of nitrogen by neutrons from cosmic radiation) has not been constant through time, calibration curves based on dendrochronology (tree ring dating) and glacial ice cores, are now used to adjust radiocarbon years to calendrical years.

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Paleontology is the study of life in past geologic periods (fossil plants and animals), incorporating knowledge of an organism's phylogeny, relationships to existing organisms, and correlation to an established chronology of Earth History.

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