The Ampang Nago Facies (or type C lithofacies) is dominated by thick layers of sandstone with minor thinly laminated shales. The shale of this lithofacies tends to be more fissile than in the other lithofacies types. Turbidite beds up to 1 m in thickness are also common among the sandstones. This lithofacies, which is the youngest in the Sangkarewang section, is exposed in the northern part of the study area, from the Ampang Nago River to the Padang Ganting area.