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Mushroom Shaped Boulder

I submitted a picture with the same subject line. My sisters and I found this boulder (approx. 300 lbs.) half buried in the creek bank at our house. I don't know much about rocks, but I was hoping that someone could help me identify the rock and explain why this rock eroded the way it did. I have more pictures that are higher quality if someone wants me to email them.
Thanks.

From Aaron Dempsey - June 09, 2008 at 13:27:26
Email:

Message: 66592

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