They have their work cut out for them, however, because radiocarbon (C-14) dating is one of the most reliable of all the radiometric dating methods.
I miss the scent of hope rising from the dry clay, spreading new life across the barren earth, writes James de Villiers.
However, to draw this conclusion we have to assume that the rate of cratering has been the same in the past as it is now.
And there are now good reasons for thinking that it might have been quite intense in the past, in which case the craters do not indicate an old age at all (see below).
There is no independent natural clock against which those assumptions can be tested.
For example, the amount of cratering on the moon, based on currently observed cratering rates, would suggest that the moon is quite old.