Light crater rims in the southern highlands of Mars

Mariner 4 image of the southern highlands south of Sirenum Fossae taken during southern mid winter. The white rims of the craters may be due to frost or clouds, but the contrast is poor. The rim at upper left may be the edge of the crater Newton. The image was taken from 7,500 miles away (12,200 km) and measures 160 miles by 150 miles (254 km by 242 km).