Its features include a Bouguer gravity anomaly of −120 mGal, a topographical surface feature shaped as a ring of 810 kilometers diameter, rock features of Late Archean and Proterozoic periods in the central part of the anomaly, granulites, and charnockites rock formations supplemented by granites at the lower crust level, and greenstone belts, and metamorphosed basalts seen as rock exposures.