11 January 2004
Looking somewhat like a martian moon that has been plunked down into a rough-textured but otherwise flat plain, this Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows an old, cratered hill was once part of the rim of a meteor impact crater. The crater has been both eroded away and partly filled and buried beneath the rugged plains. The hill is interpreted to be considerably older than the plains, because it has considerably more small meteor craters than the surrounding terrain. This hill is located near 23.0°N, 166.5°W. The image covers an area 3 km (1.9 mi) wide and is illuminated by sunlight from the lower left.