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The book begins with a review of the history of Quaternary dating from the early attempts based on biblical genealogies to recent developments involving radiometric methods.
The basics of radioactivity and concepts of Quaternary stratigraphy are also introduced.
This principle presumes that the oldest layer of a stratigraphic sequence will be on the bottom and the most recent, or youngest, will be on the top.
It does not, however, allow one to independently assign an accurate estimation of the age of an object as expressed in years.Relative dating places a rock somewhere in a time sequence – one rock is older than some rocks, younger than others – but this does not tell you the actual number of years ago that the rock was formed.However, scientists often need to know actual dates of geological events so they can study landscape and environmental change.This was dealt with in the chapter by that name (chapter 1).Second, generation of living organisms from non-living matter, or origin of life.
However, these dates sometimes change, as geologists continually work to refine them.