Help identifying some stones/artifacts

[Corey.mckenna]

i moved in recently to an old archaeologists house and started finding rocks smoothed and flat and very square. i didn't think anything of it till my rock hunting friend came over and told me i might have something. Anyone think they could help me with identifying these pics.

 

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[Corey.mckenna]

Right on! still have a lot left posting some more now

 

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[Corey.mckenna]

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not sure if these are meant to be together but they look like same rock and fit well with each other