here for larger NASA image
Click here for lunar chart showing location
This oblique view looks south over the 26-km-diameter crater Proclus
in the highlands at the western edge of Mare Crisium. Proclus is a young
rayed crater that is distinctive because of the marked asymmetry of its
ray system - a characteristic visible even in Earth-based telescopic views.
The excluded zone is along the southwest edge (top of photograph) but is
visible in this moderate Sun photo only as a slight albedo change. Laboratory
experiments suggest that a low trajectory angle might account for the asymmetry.
A number of large blocks can be seen at the edge of the crater rim. The
exceptionally large block (arrow) is about 200 m wide and, judging from
the length of the shadow it casts, nearly as high. As in several other
craters shown in this chapter, a darker layer is present in the upper part
of the crater wall. - James W. Head III.
Report Source: NASA SP-362, Page 147, Figure 147
This web page was created by Francis Ridge
for The Lunascan Project