Wall Water Features

How do collapses of natural ice or rubble dams explain the water outflow features around the Valles Marineris?

This is a possible explanation, but I do not understand how planetary scientists came to this conclusion.

Public Comments

1. Get onto Google Mars and take a good look at the east end of Valles Marineris where it turns north, look at the area between it and Vastitas Borealis. The area is called Chryse Planitia. The land forms are clearly the result of water running out of Valles Marineris. There are also places along the edges of V M that are less clearly, but still pretty obviously where water has run into VM. That water must have come from somewhere. The fact that the contours round there are fairly sharp makes it look as if the events that created these forms were not somethings that happened over a very long period, to me they look like something that might have happened once or only a few times. Maybe you should ask under geology.