Today's Image of Mars shows a relatively young crater measuring 50km in diameter. The crater has a significantly less superimposed craters than the surrounding terrain, which is how scientists determined it was a relatively recent addition to the landscape. Scientists speculate that many of the landslides we see in Valles Marineris may have occurred as a result of the impact that formed this crater, but we can never be sure.
Clicking on this image will take you to the original high resolution image from HiRISE. [See the original caption from HiRISE]