Seasonally deposited water/ice at the Spirit rover site.
SULFATE-RICH SOILS EXPOSED BY SPIRIT ROVER AT MULTIPLE LOCATIONS IN GUSEV CRATER ON MARS.
Alian Wang1, Jim Bell III2, Ron Li3, Jeffrey R. Johnson4, William Farrand5, Raymond E. Arvidson1, Larry Crumpler6, Steven W. Squyres2, Ken Herkenhoff4, Amy Knudson1, Wei Chen3, and Athena team.
Seventh International Conference on Mars.
http://www.lpi.usra.edu/meetings/7thmars2007/pdf/3348.pdf
This report gives evidence this time through PANCAM visible light wavelengths that sulfates are seasonally hydrated and dehydrated at the Spirit site.
Bob Clark
