Crater counting dating
Crater counting is a method for estimating the age of a planet's surface.
The method is based upon the assumptions that a new surface forms with zero impact craters, and that impact craters accumulate at some constant rate.
Smaller craters in mobile dunes would disappear faster and have lower mean ages.
In this sense, the derived age is a size-dependent Acrater retention [email protected] B the survival time of craters of given size.