Tharsis Montes

Three large volcanoes near Olympus Mons on Mars. Some suspect they may have formed three mountains due to plate movements.

Recent Tectonics Possible (Jan 2011)

 * See Olympus Mons, Tharsis Montes, Valles Marineris


 * http://www.space.com/9683-surface-mars-possibly-shaped-plate-tectonics.html