Color image from lunar orbit.  Rim and interior of <a href="https://en.wikipedia.org/wiki/Langrenus_(crater)" class="extiw" title="en:Langrenus (crater)">Langrenus</a> crater. North toward upper left.<br>This photo was used in Figure 18-17 of the <i>Apollo 14 Preliminary Science Report</i> (SP-272), which has the following caption:<br><dl><dd>Dark materials extending from west rim of Langrenus Crater into the crater floor. The points refer to patches preferentially occupying local topographic lows: (1) center of a small crater; (2) a linear groove; (3) floor of main crater (north toward upper left).</dd></dl><p>The text of the <i>Report</i> refers to the figure as follows:<br></p>
<dl><dd>Dark material that covers terraces and fresh scarps on the wall of the west rim of Langrenus Crater is shown in figure 18-17. The dark material extends as diffuse inward-facing lobes as far as 40 km and appears to occupy local topographic lows, including the centers of some small craters and linear grooves. The diffuse dark lobes extend down and across the faces of multiple slump scars and apparently terminate on the crater floor. These characteristics indicate postcrater modification by lava flows, pyroclastics, or highly mobile debris flows.</dd></dl>
NASA
1971-02
Lunar and Planetary Institute, Apollo Image Atlas, 70mm Hasselblad Image Catalog, Apollo 14, Magazine M, <a rel="nofollow" class="external text" href="https://www.lpi.usra.edu/resources/apollo/catalog/70mm/magazine/?73">Images AS14-73-10040 to AS14-73-10204</a>