FIGURE 4. The proximal fan channels in the Ross Formation are dominated by highly amalgamated massive to cross-bedded sandstones in an axial position that are replaced by progressively thinner-bedded, less-amalgamated massive sandstones toward the margins. Note the distinct inclined surfaces present in the east portion of the channel. These inclined surfaces are interpreted to represent channel-margin migration and suggest that this channel is somewhat sinuous. (location: Rinevilla Point) (modified from Sullivan et al., 2000b).