If these "white rock" deposits are ancient crater lake sedimentary formations as Malin and Edgett argue, it seems only natural that there would be sinkholes in their makeup.

If the near surface of Mars is even now heavily charged with water (ice, fluid, whatever) as the Odyssey GRS seems to indicate, the presence of sinkholes in the surface and in deposits like that in Becquerel should be a given, expected, just as we expect them in Florida and New Jersey.

If deposits like those in Becquerel and other craters are the result of fluid/slurry being forced to the surface from the interior, as I wonder might be the case, sinkholes and outlets or vents would be expected.

Maybe like the small quasi-circular formation with a whitish annulus seen at about the midpoint of this segement of the Becquerel deposit traverse.

Of course sometimes a crater is just an impact crater... except that on Mars, sometimes formations interpreted as impact craters are something else again.

Mars is, after all, the Planet of Illusion. Deception. Confusion.

Cheers, BRFelix