The Mountains Separating Mare Imbrium from Mare Serenitatis

Separating the two great maria, Imbrium and Serenitatis, are two mountain ranges, the Apennine and the Causasus.  The former are arcuate to the Imbrium basin and were undoubtedly formed by the impact that formed that basin.  However, the Caucasus Mountains are arcuate to neither Imbrium nor Serenitatis, so how did they form?  The clue may lie in the fact that the Serenitatis basin is somewhat younger than the Imbrium basin.  Maybe what happened was that the Serentatis impact raised the Caucasus mountains in an arc running from the current position north of Serentatis round to somewhere in the region of the current Autolychus.  A few million years later the Imbrium impact occurred and the upheaval, which should have produced a arc of mountains where the Alps now are and linking up with the Apennines, effectively pushed the Caucasus mountains to their present position.  The other mountains ringing the Serentatis basin are the Haemus in the south, and the Taurus in the East.  The Taurus mountains are not visible in this picture because the Sun had set on them.

The scale markers are approximately 200 Km north and east.  In pictures taking in a large expanse of the Moon, such as this, the scale and direction of north varies somewhat in different parts of the picture.  These markers apply around Autolycus and the northern part of the Apennine mountains.
The picture was taken with a ToUcam attached to my LX200 on 23rd September 2005 at 03:20 UT, when the Moon was 20.1 days old.

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