Features in Meridiani Planum region of Mars

Meridiani Planum, at the northern edge of the southern highlands of Mars, shows five remarkable features. The impact crater in box 1 is 50 km wide and covered in dark material, likely to be volcanic ash. This has been blown out of the crater by north-easterly winds to create the dark markings in box 2, and the patch in box 4. In the lee of high ridges, more volcanic ash has accumulated in box 5. The old crater in box 3 is covered in lighter material.