Panning down south now, to the region S of the Montes Carpatus part of the Imbrium Basin rim. In the upper part of the field of view is the trough beyond the Imbrium excavation boundary, which further south gradually transits into the E part of the Procellarum Basin.
There are some rough highland plains in this field, which were thought to be of volcanic origin, but Apollo 14 rock samples (impact shocked breccias) from the plains north of Fra Mauro revealed these to be pre-Imbrian crust covered by a blanket of debris and melt ejected by the Imbrium Basin impact.
The area has been extensively flooded in the upper Imbrian and later Eratosthenian lava flows, embaying the highland plains and leaving only traces of ancient pre-Nectarian (Fra Mauro, Bonpland, Euclides P) and Nectarian (Gambart, Reinhold B, Parry) craters. Some of the lava puddles have received separate names: Aestuum, Insularum, Cognitum, Nubium, -- but at least Aestuum and Insularum are probably not separate impact basins, but rather flooded low-lying regions created by other impacts.
The upwelling magma has fractured the floor in some craters (Encke), and was accompanied both by explosive fire fountain volcanism creating large patches of dark pyroclastic deposits (Aestuum, Insularum), and also by more quiet eruptions leaving shield domes with summit pits such as the π Milichius dome, the Hortensius domes and several others.
The recent large Copernicus impact of course dominates the view, with its central peaks, hummocky floor and bright terraced walls surrounded by a ring of impact melt and a far-flung web of crushed highland rock stretched out in bright rays across the dark mare lava of Insularum, E Procellarum and Cognitum. The landing site of Apollo 12 was selected to be right on top of one such Copernicus ray, in the hope of sampling both old pre-Nectarian bedrock material and younger mare lava. The sampled mare basalt was indeed younger than the Apollo 11 Tranquility Base mare by ~0.5 Byr (borderline Eratosthenian/Imbrian: 2.3 Byr) and the Copernicus ray material was ~0.8 Byr, which provided a good dating of the Copernicus impact.