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N
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305
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E
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33 × 43 km
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19 km
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330
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is the remains of a
Lunar Crater that lies in the northeastern part of the
Moon . It is nearly attached to the eastern rim of the flooded
Plana Crater , and southeast of
Bürg Crater . Along the northern rim of Mason is the southern edge of the
Lacus Mortis , a small
Lunar Mare . To the south is the larger
Lacus Somniorum .
This is a heavily eroded crater formation that is somewhat irregular in shape, being longed along the east-west direction. The rim is an uneven, disintegrated ring of ridges that have merged with the rough terrain to the south and east. There are clefts or valleys in the western rim that reach the eastern rim of Plana crater. The interior floor has been resurfaced by
Lava , and forms a nearly level basin within the rim. The small crater 'Mason A' lies in the northwest part of the floor.
By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Mason crater.
