Like your thinking, realizing age of a material is not necessarily age of it’s use.
Can you imagine some future archaeologist claiming the words of a Beatles tune carved on some petrified piece of wood are as old as that piece of wood? Hopefully future archaeologists will be smarter than that.
In 1988, I live in Va....Took my stone carving tools and stopped along the road in the Blue Ridge Mts. and carved 1788 in a small boulder and added some initials. Got back in the car....and LOL.