Cross dating for dendrochronology alberta executive dating

When he is dealing with ancient history and prehistory, he is making a contribution of the greatest importance and often one that is more important than that of purely literary and epigraphical sources.For the prehistoric period, which now appears to stretch from 2,000,000 years ago to about 3000 , archaeological evidence is the only source of knowledge about human activities.But prehistoric remains have always been the most difficult to interpret, precisely because there are no written records to aid in the task.

But even in properly observed and recorded stratigraphic levels there is often doubt, and the question arises: are all the artifacts and human remains found in the same level contemporary?

Is it possible that there could have been later intrusions that have been difficult to distinguish in the field?

In the excavation of a great tell like Ur or Troy the relative chronology of the various levels of occupation is the first thing to be established.

Some archaeologists, even until quite recent times, have mistakenly supposed that depth below ground level is itself an indication of antiquity.

It is also now possible, entirely on a petrological basis, to study the prehistoric distribution of obsidian (a volcanic glass used to make primitive tools).

In the third place, the archaeologist, having dealt with the material of his artifacts by classification and taxonomy, and with its physical nature by petrology and metallurgy, turns to the remaining information he can get from his colleagues in the natural sciences.

In this relative dating method, Latin terms ante quem and post quem are usually used to indicate both the oldest and the most recent possible moments when an event occurred or an artifact was left in a stratum.

But this method is also useful in many other disciplines.

The analysis of the bones has been very helpful here. If bones in apparently the same geological or archaeological level have markedly different fluorine content, then it is clear that there must be interference—for example, by a later burial, or by deliberate planting of faked remains, as happened in the case of the king lists and records in Egypt and Mesopotamia goes back only 5,000 years.

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