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<p>[QUOTE=&quot;thetracer, post: 2224101, member: 34795&quot;]Yes, I really think it is neat that we can trace where minerals and other rocky sediments have come from, their origin.&nbsp; This has been very useful in archaeological studies of where the different types of flint and obsidian have come from and how far they have traveled, via human power.</p><p><br /></p><p>Of course, coins have mostly been moved by human power, unless they got lost in some body of water.[/QUOTE]</p><p><br /></p>

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