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                                    Left.  Ridge Section 129; Right: Cropped 1200 dpi USGS color chart of Section 129                                            
Larger expanded version of color chart above
 USGS Charts 0010S-160180
Lunascan Project composite of Sections 129, 130, 140, 141
LAC_85_WAC (Original pdf)

Keeler is the large 160 km crater at the upper right of Ridge Section 129. It is connected along the eastern edge to Heaviside (Section 130), a walled plain of similar dimensions. Keeler, however, is the younger of the two formations, with more clearly delineated features. To the northeast of Keeler is the smaller crater Stratton (Section 119), and to the northwest lies Ventris (Section 118). The outer rim of Keeler is roughly circular, with a straight segment where it is joined to Heaviside. The northern portion of the rim is more irregular, with an outward protuberance to the north-northwest. Portions of the inner wall have a terrace structure, especially along the southern half. Within the crater interior, Plante lies on the eastern floor, adjacent to the inner wall. There is an interior ridge that runs from about the midpoint toward the west-southwest. The floor is generally level, with some areas of irregularity to the south. A few small and tiny craterlets mark the interior plain. Measurements with the electron reflectometer instrument on board the Lunar Prospector showed that this crater is one of a number of impact sites that show demagnetization. The low magnetic reading lies at the center of this crater, and the reduced field extends outward to about one and a half crater diameters. Scientists believe that shock demagnetization is the cause. (Credit: A lot of the information used in the section feature descriptions was obtained from Wikipedia.org. Section 129 and this directory was created by Fran Ridge and Ned Haskin of The Lunascan Project).