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🔎 UNIDENTIFIED Grooves in hard metamorphic rock

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diggetydoggy

Tenderfoot
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I'm curious if these grooves in rock may be the byproduct of indigenous people. I have not been able to find many "pollisoir" examples online from North America. This is on the Potomac River near the fall line.
 

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1625-1649 KING CHARLES I ROYAL FARTHING Coin! CLEANED PICS ADDED 1625-1649 KING CHARLES I ROYAL FARTHING Coin! CLEANED PICS ADDED U.S. PLATE, 1746 Pillar Reale, VIRGINIA & MASS. BUTTONS....ALL FROM NEW CAMPSITE U.S. PLATE, 1746 Pillar Reale, VIRGINIA & MASS. BUTTONS....ALL FROM NEW CAMPSITE 1625-1649 KING CHARLES I ROYAL FARTHING Coin! CLEANED PICS ADDED 1625-1649 KING CHARLES I ROYAL FARTHING Coin! CLEANED PICS ADDED 1625-1649 KING CHARLES I ROYAL FARTHING Coin! CLEANED PICS ADDED *UPDATE* Cleaned up nicely! Just dug one of the rarest New Jersey Contemporary counterfeits 1787 Maris 83-ii variety R7

Featured Treasure Finds

1625-1649 KING CHARLES I ROYAL FARTHING Coin! CLEANED PICS ADDED 1625-1649 KING CHARLES I ROYAL FARTHING Coin! CLEANED PICS ADDED U.S. PLATE, 1746 Pillar Reale, VIRGINIA & MASS. BUTTONS....ALL FROM NEW CAMPSITE U.S. PLATE, 1746 Pillar Reale, VIRGINIA & MASS. BUTTONS....ALL FROM NEW CAMPSITE 1625-1649 KING CHARLES I ROYAL FARTHING Coin! CLEANED PICS ADDED

Featured Treasure Finds

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