P lanktonic foraminifera biostratigraphic analysis conducted on the Brangkal River and the Plabuhan - Klitih area, with the length of the measuring stratigraphy's first track is 530m with a layer thickness of 240m, which was formed by fine carbonated sandstone lithology, medium carbonated sandstone lithology, and coarse carbonated sandstone lithology, which is comparable with Kalibeng Formation. The second track with a thickness of 70m, formed by polemic breccia lithology, carbonated sandstone lithology, sandstone inserted with carbonated shalestone lithology, which comparable with Kerek Formation. Successfully identified datum on the first track, namely: FAD Globorotalia tumida, FAD Globorotalia tosaensis, FAD Globorotalia truncatulinoides and the second track datum been identified, namely: FAD Globigerina nepenthes, FAD Globorotalia plesiotumida. Based on the datum which successfully arranged 5 biostratigraphic zone, which is Globigerina nepenthes zone, Globorotalia plesiotumida zone, Globorotalia tumida zone, Globorotalia tosaensis zone, Globorotalia truncatulinoides zone which comparable with the age of N14-N16, N17-N18?, N18-N20?, N21, dan N22. From the results of the biostratigraphic which associated with the sediment thickness, the velocity of the sedimentation rate on the first track is obtained which is 3,856 cm/kyr, and ond the second track the velocity of the sedimentation rate is 0,249 cm/kyr. In the Middle Miocene (N14-N16) sandstone inserted with carbonated shalestone deposited on marginal marine environment. Then in the Late Miocene age (N17-N18?) carbonated sandstone and polemic breccia deposited on marginal marine depositional environment. In the Early Pliocene (N18N20?) fine sandstone lithology deposited on the outer shelf depositional environment with a depth of 100-200m. Furthermore, at the age of N21 (Late Pliocene) medium carbonated sandstone deposited is still in the same depositional environment which is the outer shelf. Furthermore medium carbonated sandstones deposited at the age of N22 (Pleistocene) on the outer shelf depositional environment.