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Rima Fresnel I (1) approximately parallels the Apennine Mountain front (2) along the eastern margin of the Imbrium basin. The rille and its several branches at the northern end fall into the class of linear rilles that are usually attributed to a ten signal structural regime causing the formation of grabens. Faults in the highlands (3), parallel to some of the rilles, support the contention of structural origin for the rilles. Some of the curvilinear segments of the rilles, however, suggest that they may have served locally as lava channels.
The rille traverses a plain that was called the Apennine Bench (4)
and interpreted to be formed of older mare lavas (Hackman, 1966). The inside
of the rille is flooded by younger mare lavas (Carr, Howard, and El Baz,
1971) (5), which also embay its northern truncated terminus (6). Some younger
mare lavas may have poured over the bench material and buried a crater
(7). Old lava benches on the inside margin of basins are a common feature
on the Moon. They are usually crossed by old rilles and embayed and partially
buried by younger lavas. -B.K.L.
Report Source: NASA SP-362, Page 207, Figure 218
This web page was created by Francis Ridge
for The Lunascan Project
Section Directory 22