Unusual rock

[cmthunder]

I thought this rock was unusual with deep hole? Any fossils here?

 

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[dognose]

I don't see any fossils.

it looks to me to be an igneous stone where a softer mineral weathered out of the matrix leaving the void you see.

this is just from the photos. inspection in person holding it may yield a different opinion.

 

[unclemac]

i think what you have there is a cryptocrystalline silicate (CCS). Like chalcedony... think of it was a mineral rich fluid that filled a void and solidified and crystalized. Those squarish shapes are indicative.