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In addition, faunal succession and the use of "key" diagnostic fossils were used to correlate lithologic units over wide geographic areas. Although lithologic units could be placed within a known sequence of geologic periods of roughly similar age, absolute ages, expressed in units of years, could not be assigned. Sur les radiations invisibles mises par les sels d'uranium. Until the twentieth century geologists were limited to these relative dating methods. For a complete discussion on the development of the Geologic time scale see Berry, (1968).
In his study Rutherford (1906) measured the U and He (He is an intermediate decay product of U) contents of uranium-bearing minerals to calculate an age.
One year later Boltwood (1907) developed the chemical U-Pb method.
Ar step-heating dating technique and about the interpretation of the data generated from a step-heating experiment. On the ultimate disintegration products of the radio-active elements.
So with their encouragement I will attempt to explain the method and the criteria used to interpret the data generated from a Ar step-heating experiment.
I have just completed the data reduction on a low potassium basalt from the Medicine Lake, California, the basalt of Tionesta. Freeman and Company, San Francisco and London, 136 p.