(a) Analysis of the terrain between the light grooves and the dark terrain. (b) HiRISE magnification of the area shows the difference between the terrain of the light grooves, which appears smooth and disturbed mostly by impact craters, and the dark terrain, with numerous pits resembling ice melt pools. (c) In this field full of the interesting features as indicated, a crater responsible for the inception of one groove (“ice-scraping crater”) was evidently created before the displacement of the ice blocks occurred.