Acknowledgements Introduction his document discusses the way radiometric dating and stratigraphic principles are used to establish the conventional geological time scale. It is not about the theory behind radiometric dating methods, it is about their application, and it therefore assumes the reader has some familiarity with the technique already refer to "Other Sources" for more information. As an example of how they are used, radiometric dates from geologically simple, fossiliferous Cretaceous rocks in western North America are compared to the geological time scale. To get to that point, there is also a historical discussion and description of non-radiometric dating methods. A common form of criticism is to cite geologically complicated situations where the application of radiometric dating is very challenging.
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Hipparchus[ edit ] The discovery of precession usually is attributed to Hipparchus — BC of Rhodes or Nicaea , a Greek astronomer. According to Ptolemy 's Almagest , Hipparchus measured the longitude of Spica and other bright stars. He also compared the lengths of the tropical year the time it takes the Sun to return to an equinox and the sidereal year the time it takes the Sun to return to a fixed star , and found a slight discrepancy. Virtually all of the writings of Hipparchus are lost, including his work on precession.
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The Radiometric Dating Game Radiometric dating methods estimate the age of rocks using calculations based on the decay rates of radioactive elements such as uranium, strontium, and potassium. On the surface, radiometric dating methods appear to give powerful support to the statement that life has existed on the earth for hundreds of millions, even billions, of years. We are told that these methods are accurate to a few percent, and that there are many different methods. We are told that of all the radiometric dates that are measured, only a few percent are anomalous. This gives us the impression that all but a small percentage of the dates computed by radiometric methods agree with the assumed ages of the rocks in which they are found, and that all of these various methods almost always give ages that agree with each other to within a few percentage points.
The Sahara desert is expanding; it can only be a few thousand years old. The present Sahara Desert really is only a few thousand years old. About 7 or 8 thousand years ago the area underwent a pronounced wet phase and portions of it were habitable parkland where cattle could be grazed The Times Atlas of World History, More than 10, years ago, during the last glaciation, lakes and streams were present in the Sahara, and elephants, giraffes, and other animals roamed the grasslands and forests which covered much of the region. Not long ago radar was used to discover a fossil river which once flowed across the Sahara; the river bed is now buried beneath the desert sands.