Figure 2. (a) LROC NAC image mosaic (M154370363LC, M141446269LC, and M139071213LC) of Site 1 (downslope is northeastward) with boulder source areas (enclosed by green lines), boulder trails (green and yellow lines), and small craters (D > 5 m) in the study area (enclosed by the white line). Craters superimposed by boulder trails and those crosscut by boulder trails are shown by red and yellow circles, respectively; other craters are indicated by green circles. The areas enclosed by blue lines indicate those without boulders, boulder falls, and small craters below the boulder sources. (b) Distributions of slope angles estimated from KAGUYA topographic data at Site 1. Locations of small craters in the study area (within the black dashed line) are shown by yellow circles, and starting points of boulder falls are shown by cyan circles. Enlarged views of (c) boulder trails and small craters and (d) boulder source areas, within the red rectangles in (a).