Running water in recent times

Running water in recent times

. The inside cliff faces of this crater are etched with gullies that liquid water may have cut. Thick sequences of layered rock are also present, attesting to a Martian past of substantial geologic activity. Water has apparently seeped from between layers of rock high on the wall, and flowed downhill in deep, channels that have merged together. The lack of small craters superimposed on the gullies and their deposits indicates a geologically young age. They could have formed hundreds, thousands or millions of years ago, and they might even be contemporary. This crater wall shown in this image, taken from the Mars Global Surveyor, is located in central Noachis Terra at 47 degrees south and 355 degrees west. (Courtesy of NASA, JPL and Malin Space Science Systems).

Copyright 2010, Professor Kenneth R. Lang, Tufts University