“…Although Venus is apparently largely devoid of sediments, landers have shown that the surface is strongly weathered and may consist of sedimentary rocks (Florensky et al, 1983); dunes, wind-streaks and landslides have all been detected in Magellan data. Particularly enigmatic are the canali (Figure 1): moderately sinuous, parallel-sided channels crossing the plains, with widths of a few km and lengths of hundreds to thousands of km (Baker et al, 1992, Komatsu andBaker, 1994) that may represent exotic lava flow channels (Komatsu et al, 2001), ancient river beds (Jones and Pickering, 2003) or the result of turbidity currents (Waltham et al, 2008) in the dense atmosphere.…”