 Studies of geomorphology in the Karoo Province have identified regional uplift, associated with the underplating and consequent thickening of the crust.Seismic studies of the crust at depth have done a great deal to identify magmatic underplating, but without direct samples to look at, it can be problematic for geologists to agree on the source of an anomaly.Seismic studies of the Laccadive Islands in the Indian Ocean revealed a high-velocity layer of thickened crust between 16 and 24 km below the surface; these were corroborated with tomographic work in the nearby Kutch District, which identified a large mafic body at depth, close to the mantle.