INSET: USGS IMAP 2811: Geologic map of Cydonia Mensae - southern Acidalia Planitia, Mars

Cydonia Mensae lie adjacent to the boundary separating the highland terrain of western Arabia Terra from the northern lowlands (the dichotomy boundary), where this boundary is gradational rather than abrupt, as is generally the case. Cydonia Mensae are characterized by abundant knobs and mesas, most of which occur in well defined clusters that commonly are long and narrow. The adjacent...