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Posted in response to What is this unusual rock? from Marty Borboa on March 14, 2010 at 23:38:44:

Re: What is this unusual rock?

I have seen holes like this in a stream bed were a small hard stone turns and grinds into a larger stone. This makes a round hole in the rock. I know that there is a name for this but just can�t think of what it is. I don't know if this is the case for your rock but it could be a possibility.

From Chris - March 23, 2010 at 10:04:38
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