What is chronometric dating

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Cross-dating of sites, comparing geologic strata at one site with another location and extrapolating the relative ages in that manner, is still an important dating strategy used today, primarily when sites are far too old for absolute dates to have much meaning.

The scholar most associated with the rules of stratigraphy (or law of superposition) is probably the geologist Charles Lyell.

All the samples show loss of lead isotopes, but the intercept of the errorchron (straight line through the sample points) and the concordia (curve) shows the correct age of the rock.

The uranium-lead radiometric dating scheme has been refined to the point that the error margin in dates of rocks can be as low as less than two million years in two-and-a-half billion years.

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This volume of papers delivered to The Royal Society in February of 1992 explores the debate over the "single center" hypothesis of human origins versus "multi-regional evolution." Over the last five years there has been growing support for a recent "Out of Africa" origin of modern humans--based on fresh interpretations of the palaeoanthropological and archaeological evidence, new applications of physical dating techniques to important sites, and a greatly increased genetic data base on recent human variation and its geographical patterning.

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This book provides a review of recent progress and allows some of these doubts to be aired and discussed.

Archaeological Dating Methods introduces students to many of the more common dating methods used or found in related literature.

Most of the summarized dating methods may not be used with regularity in the field, but individuals should be informed about their existence, usefulness, and sample collection methods.

Zircon also forms multiple crystal layers during metamorphic events, which each may record an isotopic age of the event.

In situ micro-beam analysis can be achieved via laser ICP-MS or SIMS techniques.