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Old 10-22-2012, 08:34 PM   #10
thegraydog
2 wheels X 6 ways
 
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Joined: Aug 2004
Location: the Coconino
Oddometer: 589
[ http://en.wikipedia.org/wiki/Concretion

Can't work out how to quote the picture, but those little marbles you find around sandstone are concretions. Adorable!
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