Geologic map of the Oppolzer A region of the Moon Lunar Orbiter Site II P-8, Sinus Medii including Apollo landing sites 3 and 3R

The map shows the regional geology of the Oppolzer A region of the moon, where potential Apollo landing sites 3 and 3R are located. Site 3R includes a prominent mare ridge and is of greater scientific interest (Trask, 1969). The Oppolzer A region is in Sinus Medii, near the center of the lunar earthside hemisphere; it is also important because surveyor VI successfully landed near the proposed Apollo landing areas. Sinus Medii is a relatively small, densely cratered mare surrounded by terra plains and sculptured terra (Wilhelms, 1968). The geology of the region is dominated by a relatively high density of individual craters and crater clusters. Most of the craters are less than 800 meters in diameter and appear to be of secondary and primary impact origin.