Units mapped as products primarily of the Imbrium impact event are: materials of Montes Apenninus and the Alpes Formation (complex basin margin deposits), the Fra Mauro Formation (continuous ejecta blanket), the satellitic-crater materials and sculptured-terrain materials in the central and southern highlands (mainly locally derived material reworked by secondary cratering), pitted-terrain materials (materials reworked by small secondary or tertiary cratering), and terra-plains materials (a sequence of layers of feldspathic highlands-type rubble and (or) breccia deposited from fluidized clouds of basin-associated ejecta).