Figure 14.

(a) Ratio of the chemical composition of Gobabeb APXS measurements to Gobabeb pile A, the <150 μm sample ingested into CheMin and SAM. Note that samples E and F may be somewhat influenced by the underlying substrate, a sedimentary rock. (b) Select ratios of fine to coarse soil samples, including Gale crater's Gobabeb_pileA (<150 μm)/Gobabeb_pileC (150 μm to 1 mm) and Rocknest_Portage/Gobabeb pile A compared to the ratios of bright surface dust to dark soil from Meridiani Planum and Gusev crater, measured by the MER rovers [Yen et al., 2005]. (c) Ratio of the scuff at Gobabeb, Namib Dunes, and Gale crater to the scuff Edgar, in the El Dorado ripple field at Gusev crater (data from Ming et al. [2008]).