So many generations of craters preserved on Rhea.
As one looks carefully its easy to see many places on this moon with craters superimposed on each other. It's also notable that the larger craters are preserved at the lowers layers and that the succeeding layers of superimposed craters get progressively smaller and smaller in keeping wit the models of moon and planetary accretion.
Snip taken from this image:
By NASA/JPL/Space Science Institute - http://photojournal.jpl.nasa.gov/catalog/PIA07763, Public Domain, Link
