Some type of grinding stone?

watercolor

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Location
Arlington Heights, IL
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V3i, MXT-All Pro and Equinox 800
Primary Interest:
All Treasure Hunting
I found this piece near the slope of a large, meandering creek bed (NW suburbs of Chicago).
Its overall length is about 5" and both sides have been worn almost perfectly flat.

When looking closely at each side, there appears some evidence of "pecking".

Thanks in advance for any of your thoughts.

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