Explain the core drill holes found in granite or the star shaped holes cut in granite found in Maine.
Again, stone is cutted by abrasive, not some sophisticated steel. There are tons of abrasive around since the beginning of human race. You could make a drill hole in granite even with wooden stick. If you have a bronze, things become much simplier - you could cut only circumference, then remove inside with hammer.
Star shaped holes are not a rocket science too. Cut a circular hole at center, then use rope saw.
Again, stone is cutted by abrasive, not some sophisticated steel. There are tons of abrasive around since the beginning of human race. You could make a drill hole in granite even with wooden stick. If you have a bronze, things become much simplier - you could cut only circumference, then remove inside with hammer.
Star shaped holes are not a rocket science too. Cut a circular hole at center, then use rope saw.