Geophysics: Enigmatic northern plains of Mars

*Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85721, USA

e-mail: [email protected]

†Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

‡Laboratory for Terrestrial Physics, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA