Colonial Period Adz?

[Ripcon]

Now I'm not sure, but based on what I've seen on "Google" there is a possibility this adz could be colonial.
I found it at an early Louisiana plantation on Saturday.
Many of you that look at this site and post will probably be much more knowledgeable about early American tools like this. Please feel free to comment.

 

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[smallfoot]

Some good info can be gleaned here:

The Project Gutenberg eBook of New Discoveries at Jamestown by John L. Cotter and J. Paul Hudson