(mars or martian) and (soil or regolith) and (phoenix or mars exploration rover* or spirit or opportunity)
periglacial and grain size
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and shape analysis
and not climate
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Available in the MSU Map Library
Geologic Map of the Northern Plains of Mars. Scientific investigations map 2888. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2005.
Tanaka, Kenneth L.; Skinner, James A., Jr.; Dohm, James M.; Irwin, Rossman P., III; Kolb, Eric J.; Fortezzo, Corey M.; Platz, Thomas; Michael, Gregory G.; Hare, Trent M. Geologic Map of Mars. USGS Scientific Investigations Map: 3292. [Reston, VA]: U.S. Dept. of the Interior, U.S. Geological Survey, 2014.