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A prominent topographic feature on the Taurus-Littrow valley floor is the Lincoln Scarp (which merges with the Lee Scarp near South Massif). The Lincoln Scarp crosses both the valley floor and the surrounding highland material in North Massif. The mantle of light material that extends across the valley floor from the base of South Massif was investigated during the second EVA by astronauts Eugene Cernan and Harrison Schmitt. North Massif and the Sculptured Hills (in the shadow northeast of the landing site) were visited by the crew during the third EVA. The crew discovered orange soil near the rim of Shorty Crater during the second EVA; later analysis of the soil revealed a large component of orange glass beads that were interpreted to be the product of volcanic eruptions. (NASA photograph AS17-2309[P])