Tool marks that repeat on four continents.

Each of these has a local explanation, and the local explanations don't resemble each other. Bazda's grooves are Roman quarrying. Longyou's are a lost Chinese chisel technique. The Serapeum's boxes are Ptolemaic bull burials. Every one is plausible on its own ground. None explains why the marks look alike.

Two caveats. Similar marks can come from different processes; appearance is not method. And a photograph flattens the evidence that would settle it: depth, pitch, tolerance, tool-nose radius. These are the best substitute for standing there with a straightedge. They are not measurement.