Category:Apollo 15 EVA at Station 9A

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From the Apollo 15 Preliminary Science Report (NASA SP-289, 1972):

Station 9A is located at the edge of Hadley Rille approximately 1800 m west of the LM. The surface generally slopes toward the rille rim from the station site. The only visible fresh crater in the vicinity of station 9A that is larger than 2 m in diameter is the 3-m-diameter crater where samples 15535 and 15536 were collected. The undulating surface is probably largely a result of old subdued craters. Small surface lineaments are essentially absent. Many of the rock fragments have well-developed fillets banked against their sides, and in general the more rounded fragments have the best-developed fillets. Slightly protruding rock fragments with well developed fillets are commonly dust covered. The general absence of fresh craters, the rounding of rock fragments, and the well-developed fillets suggest that the sampled surface is mature.
Rock fragments are more abundant within approximately 300 m of the rille rim than they are on the mare surface to the east. Most of the fragments at a distance of 200 to 300 m are a few centimeters across. The size of the fragments increases markedly toward the rille, and near the rim are numerous boulders and bedrock protuberances from 1 to 3 m across.
...the regolith thins in the vicinity of the rille and, within approximately 25 m of the rim, the regolith is essentially absent. The abundance of rocks in the 200- to 300-m-wide zone along the rille is related to the nearness of outcrop to the surface in the vicinity of the rim.

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