Star shape appears to be plunged into the rock...any ideas...i believe it to be a marker stone...the rock is Basalt..

DanB

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Marker stone...any info...age or how the star pattern was made.....the plunge carries the star shape...all holes are 12"deep
 

Dan, You only needed to start one thread, and I don't believe the rock is related to hard rock mining
 

What tool would of made that design 12" deep ?
 

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