Posted by Altagracia on Monday, June 15, 2009 at 2:07am.
This may help you to understand superposition in geology:
http://www.google.com/search?q=superposition+in+geology&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Sra
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