Excavated rock near coal beds

[Emie]

We are having some excavation done and these rocks keep surfacing. They are 16 inches across or more, with some being nearly a yard wide. They have strange holes and appear to have interlocking parts. There is a coal mine under our property, and fire clay in the area of these rocks.

 

[Bruce R]

Looks like a horseapple

 

[vpnavy]

We are having some excavation done...

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