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Re: Chert
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Posted by RMD on July 10, 1999 at 12:39:48 from (206.83.87.97):
In Reply to: Chert posted by Jimmy on July 09, 1999 at 20:19:11:
As I understand it from engineering school, shert is a weak rock which occurs frequently in the midwest that is notoriously bad aggregrate for concrete or other uses.
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