Figure 4. Portion of the HiRISE color mosaic centered on the Bagnold dunes region investigated by Curiosity . The linear dunes are evident extending from NE to SW. The white line delineates the path taken by Curiosity , including the stop at Mount Desert Island for detailed sand-based measurements.
Both dune segments exhibit the relatively reddish-brown color seen in CRISM for the linear dunes that dominate the Bagnold dunes (Figures 1-3). The surfaces of both the MDI and Nathan Bridges dunes have wind-blown cm-high ripples (Silvestro et al., 2013; Lapotre et al., 2018; Figure 5). The key stop for dune measurements began on sol 1647 when Curiosity was commanded to analyze and acquire a sand sample at the edge of the MDI dune for analysis by CheMin (Blake et al., 2012; Lapotre & Rampe, 2018).