Abstract
Closely spaced parallel lineament sets are observed in most pictures taken by the Lunar Orbiters. These surface features may be related to subsurface fracture sets and systems and are evident on surfaces believed to be underlain by fragmental as well as consolidated material. If such is the case, then the surface expression of underlying fractures would indicate relative movement along the fractures after the overlying surface was last formed. Judging by the relationships in the pictures, the forces necessary to produce or reactivate the lineament sets are not restricted to a single temporal interval in the lunar history. Some of the rims of flooded craters appear to be younger than the interior plans and may be extrusive equivalents of “ring dykes” formed along preflooding fractures. Surface features are illustrated with pictures taken by Lunar Orbiter of the far side, Gambart, Maskelyne F, Marius, Oceanus Procellarum, Gambart C, Kepler, and Copernicus.
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