In Oceanus Procellarum in between Marius and Herodotus craters lies Herodotus Omega volcanic dome. This region contains a number of volcanic features, such as sinuous rilles and the Marius hills volcanic domes further south. Herodotus Omega is an impressive mound with a 3.5 km long crater or collapsed lava tube on the summit. With the Sun high overhead, however, it’s easy to overlook it.
Lat: 20.8 Lon: -50.0
Forum regular JFincannon has a knack of finding interesting images and came across the above feature while browsing a Wide Angle Camera (WAC) image of a region around Aristarchus. He then persevered to find the same region imaged under a lower Sun. It was well worth it to see the dome and a nearby rille pop out into view.
It is described as a “Platykurtic oblong mare dome with trench-like crater or collapsed lava tube on summit.” in the GLR Catalog of Lunar Domes and also appears in an unofficial Brungart catalogue identified by LPOD creator Chuck Wood.
This is a cross-section from the Quick Map tool showing the shape and height of the mound and depth of the central depression.
Though striking in LRO images there are ...