Figure 82
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here for larger NASA image
Click
here for lunar chart showing location
Click
here for larger NASA image
Click
here for lunar chart showing location
These intersecting sets of mare ridges are near the western edge
of Mare Serenitatis. One set of
generally small, sharply defined lobate scarps and ridges trends
irregularly east to west. It cuts across a set of broader, more subdued
ridges that trends north to south. On the basis of morphology and crosscutting
relationships, the first set appears to be the younger of the two. Study
of the better preserved younger set provides two clues to its origin. In
several places (designated by A) incomplete craters are present on the
flanks of ridges, but the other parts of the originally circular craters
are absent on the adjacent mare floor. This suggests that some segments
of the ridges are the frontal edges of thrust plates that have ridden over
an already solidified and cratered surface. In several other places (B)
craters on the mare floor appear to be partly overlapped by lobed projections
of the ridges, suggesting inundation of the craters by a viscous material.
The ridges in this area as in others may thus be the response of solidified
rocks to faulting and possibly also to the movement of molten rocks. -B.K.L.
Report Source: NASA SP-362, Page 92, Figure 82
This web page was created by Francis Ridge
for The Lunascan Project
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