The rough patch of ridges south east of Mare Vaporum is quite an interesting formation. This greyscale image taken at about the 1st quarter moon shows nice details in the mountain ridged. A colour image taken a couple years ago when the lunation was a day later shows the region to be reddish brown compared to the surrounding area.
Pyroclastic formation south east of Mare Vaporum
The best information i found describes the area as being formed from material ejected from the Imbrium impact and then later overlaid by pyroclastics – ash from volcanic vents. I assume that the valleys of the original ridges were filled in at some point by basalt lava flows.
The formation seems to be unnamed despite being of considerable interest with observations dating back to the early 1800s. On the western ridge to the south is a formation that was once called Mt. Schneckenberg but has since been de-named. It has also been referred to descriptively as the “spiral mountain”. It has also been described as an /e/ shaped formation. On the eastern ridge, about mid way along the ridge, there is half a crater (looking like a cap). This is Hyginus N. The larger creator to the south, and mostly covered from a lava flow, is Hyginus W. Observers in the late 1800s thought it might be a new formation as it was not previously noted in detailed observations from the early 1800s even though the earlier observers had the equipment and skill to have seen it.
Scope HD11 with tv 2x powermate
Chameleon at 1280×960 18fps.
Mosaic from 7 x 2min videos – 2200 frames.
Stacked best 10% (220 frames) with Autostakkert2
Processed with Pixinsight and Photoshop