==which may have been billions of years ago
If your goal is to prove evolution/old age of the universe, you might want to avoid posting articles containing words or phrases like... may, conceivably, could be, imaginably, might be, perchance, perhaps, etc. LOL
Since we currently have no way of dating the bathtub ring strata an the Victoria site, qualifying the time passed since the meteor strike seems prudent, unless one thinks Mars, too, cannot be more than six thousand years old.
Fyi..