Figure 1 shows our map of the Lander 2 site. Rocks were located on these maps using stereometric measurements and the contour maps.
Rocks form the control for delineation of other surface materials.
The rocks are assumed to be ellipsoids. O.18 m are larger at Lander 2 than Lander 1, but the reverse is true for smaller rocks. Fractions of area covered by the larger rocks in logarithmic size-bins are irregular and yield no simple relations for extrapolations to larger sizes of rocks, but the areas covered by small rocks diminish rapidly with decreasing size. Prof. Paper 1389, 222p. Res., v. 74, p. 5867-5881.