Discipline of Geology - Department of Physical Sciences - College of Science - University of the Philippines, Baguio

UP Baguio | College of Science | Department of Physical Sciences | Discipline of Geology

Recommended Readings

In the beginning, there was Ur (Endeavors Magazine, 1997)

Posted by arleneteng on November 30, 2009 at 6:21 AM

by Elizabeth Zubritsky 

As John Rogers sees it, three billion years is as far back as you can go in studying continents. Before that, they didn't exist -- not by his definition.

Traditionally, geologists determined the age of a continent based on the oldest exposed rock, which is some variety of granite. Because granites constitute the foundations of continents, geologists assumed that any granite found must date back to the continent's formation. But Rogers, Kenan professor of geology, pointed out that granites were forming and being reworked into the crust before the crust was steady enough to sustain a continent.


Article (PDF format, 112 Kb)

 

Categories: Nat Sci 3

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References

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