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[24] FIGURE 14 [above].- This highly simplified geologic map distinguishes
between the two major types of lunar terrain. Mare areas are shown in
black, and terra or highland areas are shown without overprint as they
appear on "The Earth's Moon" [courtesy of the National Geographic
Society]. The unequal distribution of mare materials is shown to advantage
on this equal area projection. Also clearly evident is the tendency of
mare materials to be concentrated within the margins of large multiringed
circular basins. The Serenitatis (7), Crisium (12), Moscoviense (17),
Ingenii (18), and Orientale (19) Maria are especially good examples. The
broad irregular expanse of mare material known as Oceanus Procellarum is
another type of occurrence.- G.W.C.