#scoopmarks #quarry
Scoop marks are one of the perennial mysteries of the Lost Ancient High Technology narrative. They can be found in many ancient quarrying sites around the world.
Here's one example of how some of those could have been formed. It doesn't explain them all but often I hear in comments that they are a total mystery. Requiring advanced technology that scoops through hard stone like it was ice cream.

Thanks to @CoolRoof1 for sharing the link
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60 meters underground! Stone mining process! Oya Stone in Japan
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