[Consort]

How could you know when something was carved on a million-year-old rock? It could have been done a couple of years ago. Yes? No?

[per loin]

The artist probably inscribed the date on it.

[farmfriend]

How could you know when something was carved on a million-year-old rock? It could have been done a couple of years ago. Yes? No?

Actually, they can tell. When the interior of a rock is exposed to the elements through carving, it begins to oxidize. Measuring the amount of oxidation will tell you how long that rock has been exposed.

[xzins]

No.

If a million year old carving had been deposited at some time in the past, then there would have been environmental accretions adhere uniformly over the entire surface of the rock to include the indentations make by the engraving.

If someone cuts into a million year old rock this year, then the edges and surfaces of the engraving will not have the layers of accretions accumulated over the years. And there's no way to duplicate them.