Supplementary material - Pliocene to Pleistocene Stratigraphy of Rembang Zone, North East Java Basin, Indonesia

Abstract

We studied seven stratigraphic sections in Rembang Zone, North East Java Basin, Central Java based on quantitative analyses of benthic faunas and planktonic foraminiferas. The parts consist of upper-part of Ledok Formation, calcareous shales/marls of Mundu Formation, glouconitic Globigerinid sands of Selorejo Formation, and blue-green shales of Tambakromo Member of Lidah Formation. We identified an N21 sequence in the Late Pliocene, with a sequence boundary (SB-21) which superimposed with irregular contact between marl of Mundu Formation and Globigerinid sands of Selorejo Formation. This irregular contact was interpreted as the based of Incised Valley, which was generated by falling sea-level in Late Pliocene. Also, we spotted the changes in biostratigraphy, paleobathymetry, and paleoclimate. There are three Pliocene biostragraphies in this section: Globorotalia margaritae zone (N19); Globorotalia miocenica zone (N20 – N21) and Globorotalia tosaensis tosaensis zone (the top of N21). Using cluster analysis, we described the correlation between variation of foraminifera and environmental change as well as bathymetry zone. Paleoclimate changes were observed by the presence of sub-tropical transition faunas (Globorotalia tosaensis tosaensis) and the increasing of tropical fauna as Globorotalia truncatulinoides in Plio–Pleistocene sediments. 

Status: under review in IJASEIT

Funding: P3MI ITB 2018