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(Freely adapted from Wikipedia)
Posidonius is a lunar impact crater (dia. 95 Km, dept. 2.3 Km) that is located on the north-eastern edge of Mare Serenitatis, to the south of Lacus Somniorum. The crater Chacornac is attached to the southeast rim, and to the north is Daniell.
The rim of Posidonius is shallow and obscured, especially on the western edge, and the interior has been overlain by a lava flow in the past. The crater ramparts can still be observed to the south and east of the crater rim, and to a lesser degree to the north.
There is a smaller, semi-circular rim of a concentric, flooded crater within the main rim, offset towards the eastern edge. There is no central peak, but the floor is hilly and laced with a rille system named the Rimae Posidonius. The floor is also slightly bulged due to the past lava uplift, which also likely produced the complex of rilles. The northeast rim is interrupted by the smaller crater Posidonius B. Within the crater rim, offset just to the west of center is another smaller crater Posidonius A.
Chacornac is an irregular lunar impact crater (dia. 51 Km, dept. 1.5 Km) attached to the southeast rim of the crater Posidonius.
The rim of Chacornac has a somewhat distorted, pentagonal outline, and appears uneven, especially in the northwest where it is attached to the rim of Posidonius. The flooded floor is irregular and uneven, and contains a system of faint rilles called the Rimae Charocnac. There is no central peak, and no trace of a ray system. The ground around the crater is rugged, with a hilly, sloping rampart to the west.
these tectonic features.
G. Bond is a small lunar impact crater (dia. 20 Km dept. 2.8 Km) to the south of the Lacus Somniorum, a small lunar mare in the northeast part of the Moon's near side. It lies to the east of the larger crater Posidonius, and to the south of the flooded crater remnant Hall. The crater is situated in a rugged section of terrain to the northwest of the Montes Taurus mountain region.
This is a roughly circular crater that has not suffered significant impact. It is a bowl-shaped formation with an interior floor that is about half the diameter of the crater. The inner walls just slope down from the rim, and lack any notable structure.
To the west of G. Bond is a prominent rille in the lava-flooded surface, designated the Rima G. Bond. This cleft follows a course roughly along a north-south orientation, and continues for a length of about 150 kilometers.
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