Perhaps no dating method has the wide range of applicability as
does the potassium argon dating method from either consideration of
the ranges of ages which can be dated or the availability of
suitable material to date. Minerals as young as tens of thousands
of years to minerals billions of years old have been successfully
dated. Many minerals retain for times of the order of billions of
years the daughter, Ar40, and many minerals contain as a component
K40 the parent element, potassium being a common element in the
earth's crust. As a result, most rock contains at least one mineral
which can be successfully dated by the potassium argon method. Even
though this method has been applied for over fifteen years, there
is as yet no work which summarizes the experimental techniques and
the results available. The sixtieth birthday ofW. GENTNER, one of
the pioneers in this field of research, is a suitable time to
present such a summary.
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