Hag Stone

Hello Steemians

This granite rock, found in a fresh water river in N Ontario.
It is very well rounded, and smooth indicating the long
amount of time in a moving river, as well as a perfectly
round hole in it, about an inch deep, and just over an inch
in diameter.
Sometimes called hag stones, or witch stones.
Piddocks a bivalve will burrow into solid rock forming
a hole.