Donald B. Bickler Joy A. Crisp Howard J. Eisen Jeffrey A. Gensler Albert F.C. Haldemann Jacob R. Matijevic Lisa K. Reid Ferenc Pavlics Henry J. Moore 1999 Most of the soil-like materials at the Pathfinder landing site behave like moderately dense soils on Earth with friction angles near 34°-39° and are called cloddy deposits. Cloddy deposits appear to be poorly sorted with dust-sized to granule-sized mineral or rock grains; they may contain pebbles, small rock fragments, and clods. Thin deposits of porous, compressible drifts with friction angles near 26°-28° are also present. Drifts are fine grained. Cohesions of both types of deposits are small. There may be indurated soil-like deposits and/or coated or crusted rocks. Cloddy deposits may be fluvial sediments of the Ares-Tiu floods, but other origins, such as ejecta from nearby impact craters, should be considered. Drifts are probably dusts that settled from the Martian atmosphere. Remote-sensing signatures of the deposits inferred from rover observations are consistent with those observed from orbit and Earth. application/pdf 10.1029/1998JE900005 en American Geophysical Union Soil-like deposits observed by Sojourner, the Pathfinder rover article