Surface processes recorded by rocks and soils on Meridiani Planum, Mars: Microscopic Imager observations during Opportunity's first three extended missions - Herkenhoff, Kenneth; Grotzinger, John P.; Knoll, Andrew; McLennan, Scott; Weitz, Catherine; Yingst, Aileen; Anderson, Robert; Archinal, Brent; Arvidson, Raymond; Barrett, Janet; Becker, Kris; Bell, James F.; et al. (Journal of Geophysical Research E: Planets, 2008)