Much of the activity at station 4 was devoted to the boulders shown in this photograph. These boulders are basalts and represent material excavated during the formation of Dune Crater. The crew reported that vesicles are abundant in the boulders at this location and that some vesicles were as large as 9 cm. in diameter. The abundance and size of the vesicles in these boulders suggest that this basaltic material cooled on or very near the lunar surface. The photo was taken during the second Extravehicular Activity EVA 2 of the Apollo 15 mission. Original film magazine was labeled KK, film type was S0168 High Speed Color Exterior or Color Interior Ektachrome EF - High speed color reversal, 60mm lens with a sun elevation of 31 degrees.
