What is this?

[chuck]

Hello,

I found this rock in a relative's backyard in southern Oklahoma. It is mostly smooth except for one side that is rough. It does not scratch glass. Please let me know if you need any more information to indentify this rock.

Thanks,


Chuck

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[chuck]

Same rock pictured with a week's wages for scale.

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[chuck]

This is the only rough part.

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[geodepat]

It looks like it was smoothed by water. The rough part could be some limestone that didn't get washed off in a stream. The rest of the rock could be some form of granite. Just my guess. Was there a stream in the back yard at one time?
This web site might help you.
www.brightok.net/~rockman/Images/okindexo-w.htm

[arappaho]

I don't know but am wondering if it's some sort of real
water worn brachiopod fossil?
Joe