T The study was conducted on the Northwest side of Mount Salak with an areaof 46.8 km2, geographically the research area was at 06o 40’ 00” S ; 106o 40’ 00” E –06o 40’ 00” S ; 106o 40’ 00” E and administratively located in Gunungsari Village andsurrounding area, Pamijahan Sub-district, Bogor Regency, West Java.Analysis of morphometric, morphography and morphogenesis aspects in thewider scope indicates the geomorphological unit differences comprisinggeomorphological units of sharply sloped mountain ranges - volcanic steep,geomorphological units of hilly high hills - sliced sharply volcanic, geomorphologicalunits of high hills slashed sharply - steep volcanic- denudational, andgeomorphological units of hilly high hills - sliced sharply volcanic-denudational. Theresearch area is part of the four geomorphology units where the volcanic processbecomes the main process of landscape forming of the research area followed by theerosional process so as to form the appearance of the landscape at the present time.The genetic of volcanic stratigraphy of the research area is derived from 2sources of eruption of Mount Salak and Mount Perbakti complex, the unit of volcanicstratigraphy is divided into 8 units namely laharic deposit unit, peuteuy mountain lavaflow unit, phreatic avalanche unit, pyroclastic fall deposit unit 2, salak mountain lavaflow unit 2, salak mountain lava flow unit 1, pyroclastic fall deposit unit 1, and perbaktimountain complex lava flow unit.The geological structures in the study area consisted of horizontal fault,oblique (normal-dexteral) fault, minor normal faults in some locations, and craterstructures.Facies of volcano research area generally divided into 2 namely facies centerand proximal facies. Center facies consist of phreatic eruption facies A, phreaticeruption facies B, facies of lava A, and pyroclastic fall facies A. Proximal faciesconsisting of phreatic eruption facies C, lava facies B, side eruption facies, and laharicdeposit facies.Genesis of Salak Mountain stratovolcano is divided into 2 main stagesnamely the formation of the complex of Mountapi Perbakti as the basement ofGunungapi Salak and the formation of Salak volcano. The formation of theGunungapi Perbakti complex goes through several stages: the initial stage offormation, the construction phase 1, the destruction phase 1, the construction phase 2,and the final stage of the Gunung Perbakti complex formation. Salak volcanicconsists of construction phase, erosional phase, destruction phase, side eruption, andformation of Salak Volcano.