Crommelin is an ancient lunarcrater that is located in the vicinity of the south pole of the Moon, on the far side. It lies to the north of the large Zeeman crater, and to the east-northeast of Numerov crater.
This formation has been almost completely worn away by subsequent impacts, leaving little more than a crater-riddled depression in the surface. There is an equally-worn crater lying across the northern rim, and 'Crommelin X' is attached to the outward-bulging northwest perimeter. The largest of the craterlets within the interior form a pair near the southern rim. There is a slight central peak, consisting of little more than a low rise in the surface.
Satellite craters
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 Crommelin crater.
Crommelin is an ancient lunarcrater that is located in the vicinity of the south pole of the Moon, on the far side.
It lies to the north of the large Zeeman crater, and to the east-northeast of Numerov crater.
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 Crommelincrater.
The heavy cratering might be taken a priori as a sign of great age, but we must remember that craters of a few hundred meters diameter can go into saturation in less than the age of Mars.
Figure 12a shows Crommelincrater, in western Arabia Terra that was chosen by Malin and Edgett as an excellent example of exhumed sedimentary layers.
While the lack of craters demolishes the chance for a statistically meaningful fit of crater counts to an isochron, it puts an upper limit on the age – not of the bedrock layers (which may be much earlier) but of the of the exhumation process.
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